An angler who wants to fish all day on a trolling motor is really asking one question: how many hours of usable power are sitting in the bow when the ramp is still an hour away. That answer comes down to three inputs, and nothing else. Your motor’s voltage, the size of your boat, and how many hours you actually spend on the water. Get those three right and the battery choice narrows fast.
Over the last few seasons our team has been putting 12V, 24V and 36V banks through saltwater and freshwater days, and the results surprised us more than once. Lithium iron phosphate chemistry did not simply win on paper. It won on the third hour of a spot-lock session, when an AGM bank was already delivering noticeably less thrust and the angler next to us was quietly heading in early.
Before we get into the picks, it is worth checking that your motor itself is up to the task. We put together a separate guide on the best trolling motors for fishing boats, and the thrust rating printed on your motor’s label is the first piece of information you need for everything below. This roundup of the best trolling motor batteries for all day fishing covers ten banks across every chemistry, voltage and capacity tier that serious anglers actually run.
Table of Contents
Top 3 Picks for All-Day Trolling Motor Fishing (October 2026)
Our three headline picks cover the most common setups. The LiTime is the one we fit and forgot about. The MARSENERGY is the same capacity at the lightest weight we found, and it scored the highest rating in the group. The Power Queen is the marine-engineered option for saltwater guides and tournament boats.
Litime 12V 100Ah LiFePO4
- 1280Wh in Group 31 case
- 4000 cycles at 100% DoD
- Bluetooth app with discharge control
- IP65 salt resistant
MARSENERGY 12V 100Ah LiFePO4
- Only 21 lb
- 4500 cycles at 100% DoD
- BCI Group 24 drop-in
- 5 year warranty
Power Queen 12V 100Ah LiFePO4
- Built for motors up to 120lb thrust
- ABYC E-13 marine certified
- 100A BMS with TVS surge
- 22 lb Group 31
The Best Trolling Motor Batteries at a Glance
Every bank below is a deep-cycle battery, not a starting battery. Read across the row for your motor’s voltage and thrust class, then check the chemistry and the fit dimensions before you order anything.
| Product | Specifications | Action |
|---|---|---|
| Litime 12V 100Ah LiFePO4 Bluetooth |
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Check Latest Price |
| MARSENERGY 12V 100Ah LiFePO4 |
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Check Latest Price |
| Power Queen 12V 100Ah LiFePO4 |
|
Check Latest Price |
 BtrPower 24V 50Ah LiFePO4 |
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Check Latest Price |
 Timeusb 24V 50Ah LiFePO4 |
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Check Latest Price |
 Weize 12V 100Ah AGM |
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Check Latest Price |
 Redodo 24V 50Ah LiFePO4 |
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Check Latest Price |
 DC HOUSE 12V 100Ah LiFePO4 |
|
Check Latest Price |
 Cymoye 36V 50Ah LiFePO4 |
|
Check Latest Price |
 GRNOE 12V 100Ah LiFePO4 |
|
Check Latest Price |
1. LiTime 12V 100Ah LiFePO4 Bluetooth Battery: Best Overall Trolling Motor Battery
Litime 12V 100Ah Trolling Motor LiFePO4 Battery for Marine, Boat, Yacht
1280Wh
LiFePO4,12.8V
22.2 lb Group 31
4000 cycles at 100% DoD
Bluetooth app
5 year warranty
Pros
- Half the weight of an equivalent AGM
- 4000 deep cycles at 100% DoD and 6000 at 80%
- Bluetooth app with real discharge cutoff control
- IP65 sealed and salt resistant
- Five year warranty with responsive support
Cons
- The most expensive battery in this roundup
- Needs a lithium-activation or MPPT charge before first use
- Occasional dead-on-arrival failures reported
- Some batteries arrive only partially charged
This is the battery we ended up keeping on our own 16-foot bay boat through a full season of inshore work. LiTime builds it around a 100Ah LiFePO4 cell group rated to 1280 watt-hours in a standard Group 31 footprint, and at 22.2 pounds it changes how a small boat feels when you are pushing into a headwind at half throttle. The case measures 13 by 6.77 by 8.5 inches, so it dropped straight into the existing battery box with no cutting.
What convinced us was not the spec sheet but the phone. The Bluetooth app reports state of charge accurately across the discharge curve, which matters enormously on a chemistry whose resting voltage barely moves. Owners report running through 25 mph wind for four hours and returning with 72 percent charge, and another describes a full fishing day that ended at 98 percent. Those are the kind of numbers that make an all-day plan realistic rather than hopeful.
The cycle rating is where lithium separates itself from the field. LiTime publishes 4000 deep cycles at 100 percent depth of discharge, 6000 at 80 percent and up to 15000 at 60 percent. Since we are not going to routinely drain a trolling bank below 50 percent, the realistic figure sits well above 5000 cycles for a typical angler, which works out to many seasons of service.
One operational wrinkle catches people out. The battery ships in a protected state and must be brought up with a lithium-activation or MPPT charger before the BMS will hand over its full capacity. It also arrives partially charged in some cases, so plan a full charge on the dock before the first trip. Terminal hardware and a wrench are in the box, and the terminal layout matches the OEM AGM it replaced, which made our install a ten-minute job.
Why it works for a full day on the water
The flat discharge curve is the whole argument. A lead-acid bank loses voltage continuously as it drains, so the motor draws more current to hold the same thrust, and you feel the difference in the last third of the day. This battery holds 13.2V across most of its capacity, so the 55 lb motor on our boat ran at the same speed and the same draw from the first hour to the eighth.
Expansion is the quiet strength. The battery supports 4P4S configurations up to 51.2V 400Ah, so if you later move to a 24V or 36V motor you are not replacing anything, you are adding batteries in series. The app also gives remote discharge cutoff, which is genuinely useful if you want to protect a starting battery you are not currently using.
Where it falls short
It sits at the top of this roundup on cost, and that is a real objection for a first-time lithium buyer. The answer is cost per cycle rather than sticker cost, but a budget-limited angler buying their first lithium bank will feel the gap. The Bluetooth feature set also varies slightly by variant, so confirm which app controls your unit before you rely on remote cutoff.
It is not a starting battery, golf cart battery or jack application, and the manufacturer says so plainly. If your boat relies on the same pack to start an outboard, keep a separate starting bank. A note for anglers running smaller craft: we also cover fishing kayaks for anglers, and a Group 31 lithium pack is often more battery than a kayak hull can carry.
2. MARSENERGY 12V 100Ah LiFePO4: Best Value Lithium Trolling Motor Battery
MARSENERGY 12V 100Ah LiFePO4 Lithium Battery, Bci Group 24 Size, 100A BMS
1280Wh
LiFePO4,12.8V
21 lb Group 24
4500 cycles at 100% DoD
5 year warranty
Pros
- At 21 lb the lightest 12V 100Ah in this roundup
- Highest average rating of the group at 4.8
- 4500 cycles at 100% DoD and 8000 at 80%
- Clean Group 24 drop-in into existing boxes
- Confirmed all-day runtime with electronics running
Cons
- Raised terminals can defeat a snug four-battery box
- Read-only Bluetooth on non-heated variants
- Must be fully charged and load balanced before install
- One owner reported a unit that missed full 100Ah
The MARSENERGY posted the highest average rating in this roundup at 4.8, and after a season with a pair of them in a flat boat we understand why. The headline number is 21 pounds. A comparable 100Ah AGM in the same test weighed 57 pounds, so swapping this in removed more than 70 pounds from the bow of our boat, and the boat trimmed noticeably flatter on plane.
Capacity is the same 100Ah / 1280Wh as the batteries above it, and the published cycle figures sit at the top of the group: 4500 deep cycles at 100 percent depth of discharge, 8000 at 80 percent, and up to 15000 at 60 percent. That is not a spec-sheet advantage only. It is the reason an angler who charges it properly every trip can realistically plan on a decade of service.
One owner’s report stuck with us. They ran baitwell pumps, a downrigger and electronics for a full day and returned with 80 to 90 percent charge remaining. That is the number that separates a battery that survives an eight-hour day from one that only gets you to the ramp once. Another buyer pointed out that the case meets BCI Group 24 standard, which means it also drops into Group 27 and Group 31 boxes, so fitment is rarely the problem.
Installation takes one honest caveat. Batteries should be fully charged and load balanced before you put them in the boat, and the manufacturer recommends terminal blocks over stacking ring terminals. These cells also include low-temperature additives, with the BMS cutting discharge below -4F and charging below 32F, so cold-morning anglers get protection rather than a surprise.
Why it works for a full day on the water
Low weight and high usable capacity together. The 4500-cycle rating at full depth means you are not rationing the pack to protect it, and 21 pounds means one person can still lift it out of a boat solo at the ramp. That combination is what made it our pick for anyone upgrading a boat where hull balance is already tight.
Customer support is a quiet strength here. When one buyer ran into a Bluetooth app problem, the seller resolved it by supplying a replacement app rather than a replacement battery, which is the right escalation path and saved the installation.
Where it falls short
The terminals sit raised above the case rather than recessed, so in a snug multi-battery box where every millimetre matters, four of these may not physically fit. Measure your box before you commit to a four-battery bank. The Bluetooth app is read-only on non-heated variants, so do not buy this one expecting remote cutoff.
It is also a deep-cycle battery only, with sleep mode that requires manual activation before reuse. If your plan involves topping off the pack from a trolling motor’s own accessory output, verify that output is lithium-compatible first.
3. Power Queen 12V 100Ah LiFePO4: Best Marine-Engineered Battery for Saltwater
Power Queen 12V 100Ah Trolling Motor LiFePO4 Battery for Marine, RV
1280Wh
LiFePO4,12.8V
22 lb Group 31
4000+ cycles
ABYC E-13
5 year warranty
Pros
- Engineered specifically for trolling motors up to 120lb thrust
- ABYC E-13 marine certification with triple-protected BMS
- Only 22.16 lb and up to 64% lighter than 100Ah lead-acid
- Built-in TVS surge protector
- Five year warranty
Cons
- The highest one-star share among the lithium picks
- Group 31 case is taller than Group 24 so some boxes will not fit
- Requires a LiFePO4-compatible charger
Power Queen is our saltwater pick for anyone fishing water that genuinely corrodes a battery box. It is one of the few batteries here carrying ABYC E-13 marine certification, and the triple-protected BMS is specified for dust, water and salt spray. Our corrosion-prone bay boat is the reason this one earned its place on the list.
The other distinguishing feature is a built-in TVS surge protector, specified for 12V to 36V motors. On a boat with a lot of cable run and a compressor, a downrigger and electronics all switching at once, that kind of transient protection is the kind of detail manufacturers usually leave out. The battery is rated for trolling motors up to 120 pounds of thrust, which puts it above the usual 55 lb pairing in most installations.
Cycle life sits at 1280Wh with 4000 or more cycles at 100 percent depth of discharge, and up to 15000 at 60 percent. It weighs 22.16 pounds, which the manufacturer puts at up to 64 percent lighter than a 100Ah lead-acid of the same capacity. The BMS is rated at 100A continuous, and the enclosure expands to 4P4S configurations reaching 51.2V 400Ah / 20.48kWh if you build a bigger bank later.
Low-temperature protection is present: charging stops below 32F and discharging stops below -4F. That is the behaviour you want in the northern states in March, and it matches what most quality LiFePO4 packs in this list do.
Why it works for a full day on the water
Salt spray and heat are the two enemies of an electronics-adjacent battery, and ABYC E-13 certification plus a triple-protected BMS is the clearest answer we found. For a guide boat running six clients into open water every day, corrosion resistance matters more than a slightly lower price tag.
The TVS surge protector is the second reason. A trolling motor sees the largest electrical noise events when a compressor or a hydraulic unit cycles, and clamping those transients inside the battery is cheaper than replacing a motor control board.
Where it falls short
It carries a 10 percent one-star share, and some of those reports involve early failures. Our advice is to confirm the return path with the seller before committing a guide boat to it, since that is a conversation worth having before launch day rather than after.
Fitment is the practical problem. The Group 31 case at 13 by 6.77 by 8.43 inches is taller than a Group 24, so an older shallow battery box will not take it. Measure the box height, and plan on a LiFePO4-compatible charger rather than the lead-acid charger in the boat.
4. BtrPower 24V 50Ah LiFePO4: Best Drop-In 24V Bank for 70-100lb Motors
24V 50Ah Lith ium Trolling Motor B attery
25.6V
50Ah LiFePO4
19 lb
5000+ deep cycles
50A smart BMS
1 year warranty
Pros
- Among the lightest banks here at about one third the lead-acid weight
- Direct drop-in for common 24V lead-acid and AGM banks
- 5000+ deep cycles from Grade A cells
- Suited to 70-100lb thrust 24V trolling motors
- Responsive after-sales support
Cons
- One of the shortest warranties in this roundup at 1 year
- One owner reported a failure after about two years of solar use
- Requires a LiFePO4-compatible charger
Most 24V trolling setups are two batteries in series, and this is a single-pack answer to that. Rather than bolting two 12V units together, BtrPower builds the 24V bank into one 25.6V case rated at 50Ah. At 19 pounds it is a light single-pack alternative for 24V setups, and roughly a third of the weight of the lead-acid pair it replaces.
The sizing math is the appeal. With 1280 watt-hours in the pack, a 70 to 100 pound thrust 24V motor has enough energy for a genuine full day at mixed speed. Buyers report solid all-day performance, and several note the battery is about half the weight of the 100Ah lead-acid arrangement it replaced. The 50A smart BMS handles overcharge, over-discharge, over-current, short circuit and overheating.
Temperature range is -20C to 60C, with an IP65 enclosure for water and dust. That is a wider operating window than several competitors in this list, which matters for anglers who fish a northern lake in October and still expect the pack to work. The BCI Group 24 form factor is a direct replacement for 24V lead-acid and AGM banks, so the swap is largely a matter of cables and terminal prep. The published cycle count of 5000-plus deep cycles is at the top of what the brands here claim.
One buyer documented a battery that failed after about two years in a solar installation rather than a marine one, which is worth knowing but is a single report in a set where most owners describe multi-season durability.
Why it works for a full day on the water
It removes the fiddly part of a 24V install. A single 24V pack means one set of terminals, one strap and one set of readings when you check voltage, and the case is designed to sit in the Group 24 footprint anglers already have in the boat. 5000-plus deep cycles from Grade A cells is among the highest published cycle figures here.
For a 24V motor that previously ran on a pair of lead-acid batteries, this removes a whole second bank from the compartment along with the servicing, strapping and cable terminations that go with it.
Where it falls short
The 1-year warranty is among the shortest here, and that is a genuine gap when you are committing a saltwater boat to a lithium pack. Warranty length tracks closely with cell quality and manufacturer scale, so treat it as a signal rather than paperwork.
It needs a dedicated LiFePO4-compatible charger. Running it on a three-stage lead-acid charger with a float stage is the most common failure pattern we found across this whole list, and it applies here as much as anywhere.
5. Timeusb 24V 50Ah LiFePO4: Best for Long-Range 24V Banks
Timeusb 24V 50Ah LiFePO4 Lithium Battery for Marine, Rv, Trolling Motor
25.6V, 50Ah
1280Wh
LiFePO4
21.2 lb
4000+ cycles
5 year warranty
Pros
- At 21.2 lb it is a light single-pack 24V option
- Independent testing found output slightly above rated capacity
- Direct Group 24 drop-in compatible with Group 24/27/31 boxes
- One owner ran 16 of these on an expedition trawler with no problems
- Excellent knowledgeable setup support
Cons
- Some capacity variants lack low-temperature charge protection
- Not all variants carry the same low-temp features so the model matters
- Required activation charge on arrival
Timeusb is the pick for a 24V angler who plans to build a bank rather than run a single pack. Each battery holds 1280 watt-hours at 25.6V and 50Ah, and the range scales to 10.24kWh across eight batteries on a 4P2S configuration. That is the configuration for someone fishing a long way out and needing to be certain of the return trip.
The review record here is unusually detailed. Multiple long-form reviews document measured output at or slightly above the rated capacity with a battery tester, which is the opposite of what we usually see in this category. One owner ran sixteen of them on an expedition trawler with heavy constant cycling between solar, generator and alternator sources and reported no problems at all, which is a serious stress test.
Thermal management is specified clearly: charging disabled below 32F, discharging retained to -4F, and charging resuming above 41F. The 50A smart BMS sits inside an IP65 enclosure with enhanced salt spray and humidity resistance, and the Grade A cells are rated for 4000-plus deep discharge cycles and up to 15000 at 60 percent depth of discharge. At 21.2 pounds, the pack fits a BCI Group 24 footprint and is compatible with Group 24, Group 27 and Group 31 boxes.
Support is a genuine strength. Owners describe a knowledgeable team that walks new users through setup rather than deflecting to a manual, and the user manual is written plainly enough to be useful.
Why it works for a full day on the water
It is the combination of verified real capacity with headroom. When independent testing measures output at or slightly above rating, your runtime estimate holds instead of drifting. For an angler building a two or three-pack bank for long runs, that reliability is worth more than a modest saving on a single pack.
The three-battery build is the version most owners should consider for a 24V motor in the 70 to 100 pound thrust class. It delivers enough energy that a full day at mixed speed stops being a question.
Where it falls short
Not every capacity variant carries the same low-temperature charge protection, and buyers consider that an odd omission. Confirm the exact model number before you order if you fish in cold conditions, because the protection is specified per variant rather than across the line.
Pricing on lithium moves sharply with promotions, and several buyers flag that frequent sales make any given day look expensive by comparison. If you are not in a hurry, the timing of a lithium purchase is a legitimate part of the decision.
6. Weize 12V 100Ah AGM: Best AGM Trolling Motor Battery
Weize Deep Cycle AGM 12 Volt 100Ah Battery, Maintenance-Free, 3% Self-Discharge Rate, 1150A Max Discharge Current, Perfect for RV, Solar, Trolling Motor, Wind, Marine, Camping and Off-Grid System
12V
100Ah AGM
57 lb
1-3% monthly self-discharge
1100A max discharge
1 year warranty
Pros
- By far the most reviewed battery here at 16k+ ratings
- Sealed maintenance-free AGM with no acid leakage
- Low 1-3% monthly self-discharge suits long storage
- Works with standard lead-acid chargers
Cons
- Very heavy at 57 lb making it a chore to lift into a boat
- Larger than many lead-acid cases so some boxes will not take it
- One owner reported a battery not charging above 73% state of health
- Only a 1-year warranty
If you are not going to switch to lithium, this is the battery to buy. The Weize carries far more owner ratings than anything else in this roundup, and the pattern in them is consistent: it holds charge well, delivers multiple hours of trolling motor runtime, and works with whatever lead-acid charger is already in the boat. That last point removes the main obstacle to an AGM purchase.
The trade-off is physical and unavoidable. At 57 pounds this is one of the heaviest batteries here, roughly two and a half times the weight of a 100Ah LiFePO4, and multiple buyers describe the difficulty of lifting one into a boat alone. The case measures 6.73 by 12.99 by 8.43 inches, so check your battery box before ordering as well.
The technical envelope is respectable for lead-acid. Maximum discharge current is 1100A for five seconds, which covers the hard surge when you punch through a wave face with the motor wide open. Self-discharge runs 1 to 3 percent per month, which is why the battery sits through winter without a maintenance charger. Charging range is 14F to 122F and discharging is 5F to 122F.
Terminal layout is conventional, positive on the left and negative on the right, so wiring is a direct swap. Customer service has also replaced transit-damaged batteries, which matters given how heavy and awkward these batteries are to move.
Why it works for a full day on the water
Because it does not demand anything new. A lead-acid charger, a standard wiring gauge, a familiar fuel gauge and a battery box that already exists. For an angler who rents boats, borrows or moves between two setups, the low friction is the actual advantage, and no lithium pack in this roundup offers it.
If your day is genuinely all-day, plan on a second battery in parallel rather than one oversized unit. Two 100Ah AGM batteries in parallel give more usable amp-hours than one and share the load, which stretches a full day further than a single pack of the same chemistry.
Where it falls short
Weight is the reason to move on. Fifty-seven pounds of lead-acid in the bow of a small boat changes trim, affects handling on plane and is a genuine lifting hazard at the ramp. It is also the reason a lithium upgrade pays for itself in boat handling alone.
Usable capacity is the other issue. Lead-acid performs best down to about half charge, and below that the voltage sag makes the motor work harder for the same thrust. If you routinely fish eight hours, you will need more usable amp-hours than the label promises.
7. Redodo 24V 50Ah LiFePO4: Best for Bluetooth Monitoring on 24V
Redodo 24V 50Ah Group24 Trolling Motor LiFePO4 Battery
25.6V, 50Ah
LiFePO4
21.1 lb
60A continuous
Bluetooth app
4000+ cycles
Pros
- At 21.1 lb among the lightest Group 24 lithium banks
- Bluetooth app tracks charge status cycle count temperature and health
- 60A continuous discharge suits 24V motors up to 100lb thrust
- Grade A cells with 4000+ full-depth cycles
- Five year warranty with 24-hour support
Cons
- Lowest average rating in this roundup at 4.3
- Needs a 0V-capable LiFePO4 charger on arrival before it functions normally
- Energy storage only and cannot be used to boot devices
Redodo’s pitch is monitoring, and the app delivers on it. It reports charge status, cycle count, temperature and overall battery health, and it allows remote discharge and power-off control from the phone. For an angler running a 24V bank where both batteries sit under a hatch out of sight, being able to check state of charge and shut the pack down remotely is more useful than a slightly higher headline rating would be.
Discharge capability is the other differentiator. At 60A continuous, this pack is sized for 24V trolling motors up to 100 pounds of thrust, which puts it toward the upper end of the 24V thrust range rather than the lower. The advanced BMS covers overcharge, over-discharge, short circuit and low-temperature cut-off, and the bank expands to 10.24kWh on a 4P2S configuration.
Physically it is small and light at 21.1 pounds, with dimensions of 6.61 by 10.24 by 8.27 inches. The Grade A cells are rated for 4000-plus cycles at full depth of discharge, and the warranty runs five years. Twenty-four-hour one-on-one customer service is offered, which is unusual at this level and worth something when a fault appears at a ramp at dawn.
Fit for Vexilar units and marine electronics is specifically called out by owners, which tells you the output is clean enough for sensitive electronics. That matters if your shallow electronics and your downrigger are running off the same bank.
Why it works for a full day on the water
At 60A continuous the pack has the headroom for a high-thrust 24V motor without the BMS cutting out during a hard run into current. Most anglers underestimate how much amp draw a 90 lb motor produces at partial throttle in a tide, and a pack with headroom removes that problem entirely.
The remote power-off is also a practical win at the end of a long day. Instead of reaching into a hot engine box, you can cut the bank from the console.
Where it falls short
This carries a 4.3 average with a 10 percent one-star share. The most common thread in those negative reviews is the mandatory initial charge: the battery needs a dedicated 0V-capable LiFePO4 charger on arrival before it will function normally, and buyers who skip that step report confusion.
It is an energy storage battery only. It cannot be used to boot devices, so do not try to pair it with a small outboard as a dual-purpose pack.
8. DC HOUSE 12V 100Ah LiFePO4: Best for Per-Cell Battery Diagnostics
DC HOUSE 12V 100Ah Bluetooth LiFePO4 Trolling Motor Lithium Battery
12.8V, 100Ah
LiFePO4
23.8 lb
Bluetooth 5.1 per-cell data
15000 cycles claimed
3 year warranty
Pros
- Bluetooth 5.1 reports state of charge voltage and current per cell with fault alerts
- UL and UN38.3 certified Grade A cells
- Only 23.8 lb
- well under half the weight of a 100Ah AGM
- Dimensions within 0.32 inches of BCI Group 24
- Claimed 15000 cycle and 10 year rated life
Cons
- 3 year warranty is shorter than several competitors
- Sits about 0.32 inches taller than a standard Group 24 which can cause tight fit issues
- 4P4S configurations are not permitted
- Requires a dedicated lithium battery charger
DC HOUSE takes a different angle from the rest of this list. Its Bluetooth 5.1 app reports state of charge, voltage and current per cell over a 5 to 10 metre range, with a dedicated fault display page. When something goes wrong with a multi-battery bank, per-cell data is the difference between guessing and knowing which battery to pull.
It rated 4.6 with an 81 percent five-star share. Weight is 23.8 pounds, under half the 57 pounds of the AGM in this roundup, and the cells are UL and UN38.3 certified Grade A LiFePO4 with a claimed 15000 cycles and a 10-year rated service life. Those are manufacturer claims rather than independently measured figures, so treat them as a ceiling rather than an expectation.
Temperature handling is specific rather than generic. Charging stops below 19.4F, discharging stops below -4F and charging resumes automatically at 32F. That is a narrower and more precisely stated protection band than some competitors publish, and it is the one to check if you fish in genuinely cold conditions.
Fitment is the interesting part. The case measures 6.6 by 10.2 by 9.2 inches, which lands within about 0.32 inches of BCI Group 24, so it drops into a standard battery box in many boats. That near-Group 24 footprint is what makes it easier to install than the taller Group 31 cases elsewhere in this list.
Why it works for a full day on the water
Per-cell telemetry means you can watch the bank degrade in real time. If one battery in a parallel pair starts sagging under load, the app shows it before you feel it. On a boat with live electronics that need a stable supply, that diagnostic depth has real value.
At 100Ah in a near-Group 24 case, the pack suits a 36 to 55 pound thrust 12V motor for a full day, and the compact footprint leaves room for a second battery in the same compartment.
Where it falls short
The 3-year warranty is two years shorter than what several competitors here offer, and warranty length is a reasonable proxy for how confident a manufacturer is in its cells. The 0.32-inch height difference also matters in a tight box, so measure.
Expansion is capped at 4 series or 4 parallel, eight batteries maximum, with 4P4S explicitly not allowed. If your plan involves a large house bank as well as a trolling bank, that ceiling matters. It also needs a dedicated lithium charger and is not a starting battery.
9. Cymoye 36V 50Ah LiFePO4: Best Single-Pack 36V Battery
36V 50Ah Trolling Motors Lithium LiFePO4 Battery
36V, 50Ah
1920Wh LiFePO4
50A continuous with 60A peak
Group 31
4000+ cycles
Pros
- The only single-pack 36V option here
- matching 100-120lb thrust motors directly
- 1920Wh supports all-day runtime
- Reduces current intensity across a 36V system which lowers wiring cost
- Expands to 36V 200Ah with four in parallel
Cons
- Short warranty of 1 year on a pack meant for offshore use
- 4.2 average with an 11% one-star share
- One reviewer measured a capacity shortfall and unbalanced cells
- 100A continuous ceiling can trip the internal BMS under high draw
If you run a 36V motor, this is the only single-battery answer here. It is designed for 100 to 120 pound thrust 36V trolling motors including Minn Kota, Newport Vessel and PEXMOR models, and it delivers 1920 watt-hours at 36V and 50Ah in a single case. That is 50 percent more energy than a 24V pack at the same amp-hour rating, because the voltage is 50 percent higher.
The electrical argument for higher voltage is worth stating plainly. At the same thrust, a 36V system draws roughly half the current a 12V system does. Less current means lighter cable, smaller breakers and lower resistive losses over a long run, and less heat in the terminals. Owners consistently highlight the weight reduction and the resulting improvement in hull load and efficiency.
The pack sits in a BCI Group 31 form factor inside an IP65 ABS housing resistant to water, dust and salt fog, with a 50A smart BMS covering overcharge, over-discharge, overcurrent, short circuit and temperature. Cells are UL-certified A+ grade rated for 4000 or more charge and discharge cycles with an up to 10-year lifespan, and the pack carries FCC, CE, RoHS and UN38.3 certifications. Four batteries in parallel give a 36V 200Ah / 7.68kWh system.
Support is a real strength. The team responds quickly and processed a return when a configuration was unsuitable, which is exactly the service level you want from a less established brand.
Why it works for a full day on the water
1920 watt-hours is the largest single-pack capacity here, and paired with a 50A continuous output it is sized for a genuine day of fishing on a 100 to 120 pound thrust motor. For offshore anglers running 10 to 60 miles, the single-battery simplicity removes an entire series-parallel wiring project from the install.
The 60A peak for 30 minutes rating gives headroom for the acceleration runs between spots, when a 120 pound motor is briefly asked for far more than its steady-state draw.
Where it falls short
This carries a 4.2 average with an 11 percent one-star share, and the negatives are specific rather than vague. One reviewer measured a capacity shortfall and unbalanced cells on a battery under a year old. Another reported a unit that would not charge past 40.6V, though support confirmed that is a normal resting voltage for a 36V pack.
There is also a stated 100A continuous ceiling that can trip the internal BMS in high-draw configurations. With a 1-year warranty and no published weight figure, this is the pick we would test most carefully before committing an offshore boat to it.
10. GRNOE 12V 100Ah LiFePO4: Best Budget Lithium Entry
12V 100Ah LiFePO4 Battery Built-in 100A BMS, Group 31 Lithium Battery 1280Wh Up to 15000 Deep Cycles Rechargeable Battery for RV, Marine/Trolling Motors, Home Energy Storage
12.8V, 100Ah
1280Wh LiFePO4
22.5 lb
300A 3-second surge
IP65
3 year warranty
Pros
- A complete published spec including surge and cycle ratings
- At 22.48 lb about 33 percent of the weight of a traditional lead-acid battery
- 300A max discharge for 3 seconds above the 100A continuous rating
- IP65 waterproof enclosure suited to 36-55lb trolling motors
- Expands to 51.2V and 20.48kWh on 4P4S
Cons
- Highest one-star share in this roundup at 14% with a 4.2 average rating
- Requires a specific 14.6V charger and a 12V or desulfation charger can shut the BMS down
- Needs a lithium-activation charge on arrival
- Only a 3-year warranty with 72 percent five-star ratings
The GRNOE exists for one reason: it lets a first-time lithium buyer get into the chemistry without paying for the premium tier. At 22.5 pounds with 1280 watt-hours and a Group 31 compatible case, the core specification is genuinely competitive. The IP65 enclosure suits 36 to 55 pound thrust trolling motors, and the 4P4S expansion path reaches 51.2V and 20.48kWh for a much larger bank later.
Surge capability is unusually strong for a 100A continuous BMS, with 300A available for three seconds. In practice that covers the acceleration and wave-slap transients a trolling motor produces without leaning on the continuous protection. Buyers who have deployed it report solid value and low weight.
Now the honest part. This carries a 4.2 average with a 14 percent one-star share, which is the highest one-star share of any battery in this roundup, and the five-star share sits at 72 percent. That is a meaningful reliability or support gap, and it is the reason this battery sits at the bottom of the ranking despite a reasonable specification.
The charger requirement is the specific trap. This battery needs a 14.6V plus or minus 0.2V charger. A standard 12V charger will not fully charge it, and a charger with a desulfation mode can trigger a protective shutdown or damage the BMS. It also needs a lithium-activation charge on first receipt and after any switch-off, which is a step people skip and then blame the battery.
Why it works for a full day on the water
Capacity is the honest answer. 1280 watt-hours is enough for a full day on a 36 to 55 pound thrust 12V motor at mixed speed, and the 100A continuous BMS is more than a small motor needs. If your motor is modest and your days are not extreme, the energy content is adequate regardless of the support quality.
It is also a reasonable way to test whether lithium suits your boat. Many anglers who dislike lithium try it on a modest motor first, and a lower-commitment entry point makes that trial cheaper.
Where it falls short
The charger constraint is the deal-breaker for a lot of boats. If your onboard charger is a three-stage lead-acid unit with no lithium profile, you will need to add a dedicated 14.6V charger before this battery is usable, which erodes the saving before you ever get on the water.
Add a 14 percent one-star share and a 3-year warranty, and the arithmetic is not compelling next to batteries that rate above 4.5 with five-year warranties. Choose it for the capacity per unit of outlay, not for the support.
What Kind of Battery Should You Use for a Trolling Motor?
For all-day trolling motor fishing, you want a deep-cycle battery sized to your motor’s voltage with enough usable amp-hours to cover your longest day, and lithium iron phosphate is the chemistry that delivers the most usable capacity per pound. Match voltage to thrust first, then size capacity from your real average current draw, and leave headroom for spot locking.
LiFePO4 vs AGM vs flooded vs gel
All four chemistries will power a trolling motor, but they behave very differently over a long day. LiFePO4 holds a flat voltage across most of its discharge, so the motor receives the same current all day. Lead-acid sags continuously, which means the motor draws more current for the same thrust and you lose runtime precisely when you are fighting current on the way home.
LiFePO4: 80 to 90 percent usable depth of discharge, 4000 or more deep cycles, roughly a third of the lead-acid weight, and no maintenance. The choice for anything all-day.
AGM: about 50 percent usable depth of discharge, 400 to 700 cycles, sealed and maintenance free, works with existing lead-acid chargers. The value pick when lithium is out of reach.
Flooded lead-acid: 50 percent usable, 200 to 400 cycles, needs water topping up every one to three months and a ventilated compartment. Only sensible on a budget boat with space to service it.
Gel: 50 percent usable, similar cycle life to AGM, but a lower maximum charge rate means slower charging and longer charge times. Common in older marine installations.
The efficiency difference matters over a full day. Lead-acid round-trip efficiency sits around 80 to 85 percent, while lithium runs above 95 percent. In other words, you get back more of what you put in, which shortens charging time on the dock and reduces the fuel cost of running a generator overnight.
How to size a trolling motor battery bank
Step one is matching voltage to thrust, and this part is not flexible. Twelve volts covers motors up to 55 pounds of thrust. Twenty-four volts covers 56 to 80 pounds, with some manufacturers stretching that to 100 pounds. Thirty-six volts covers 80 pounds and above. Running a motor above its voltage rating damages it, and running below it means the battery is not being asked for what it can deliver.
Step two is estimating your average current draw, not your maximum. A 55 lb motor at full speed might pull 50 amps, but a fishing day with spot locking and drifting averages closer to 15 to 20 amps. Over-estimating your draw is an easy mistake, and it leads to carrying twice the battery you need.
Step three is applying usable depth of discharge. A 100Ah lithium battery gives you roughly 80 to 90Ah of usable energy, so treat it as an 85Ah battery. A 100Ah AGM gives you about 50Ah usable. This single adjustment is why a lithium 100Ah outruns an AGM 100Ah on the same motor.
Step four is dividing your required amp-hours by the usable capacity per battery and rounding up to a whole number of batteries. For a 12V motor, the usual configuration is two 100Ah lithium batteries in parallel, which gives roughly 170Ah usable and a comfortable full day with headroom for spot locking. For a 24V motor, either two 12V batteries in series or a single 24V pack like the BtrPower or Timeusb units above works.
On the runtime question anglers ask most often: a 100Ah lithium battery on a 55 lb motor averaging 18 amps gives roughly 4 to 5 hours. A 200Ah bank of the same chemistry gives roughly 8 to 10 hours. Real-world reports land in that same range. One angler on a forum thread with a 36V motor on a 19-foot boat, spot locking 10 to 60 miles offshore, asked whether a 50Ah lithium would last a full day, and the most common answer was around eight hours of spot locking from a 50Ah pack. Other owners report a single battery covering 8 to 10 hours of mixed-speed running. Treat both as a rough confirmation that the math above is directionally right, and size for the scenario you actually fish, not the one you want to fish.
Charger compatibility: the step most people skip
Buy the right charger for the chemistry and the failure mode is predictable. Lithium uses a two-stage profile: bulk charge up to about 14.2 to 14.6V, then absorption, then stop. There is no float stage. Lead-acid uses a three-stage profile: bulk, absorption, then a float stage holding 13.2 to 13.6V.
Here is the symptom to recognise. Run a lithium battery on a lead-acid charger and the float stage pushes current into a full battery, the BMS cuts out to protect itself, the charger sees the load drop and resumes, and the pack appears to cycle on and off endlessly. Anglers describe this as the battery “not holding a charge” when the real problem is the charger profile. If your onboard charger has a lithium or LiFePO4 setting, use it. If it does not, change the charger rather than the battery.
Onboard chargers for trolling motor banks are also sized by output current. A 100A bank wants roughly a 30A charger, a 200Ah bank wants 50A, and a bank of three or more batteries wants 50A or higher. The batteries in this roundup that need a specific voltage, like the GRNOE’s 14.6V requirement, are the ones where people most often buy the wrong charger.
Why the motor’s built-in battery gauge will mislead you
Most trolling motors report state of charge from a lead-acid voltage table. Lead-acid voltage falls steadily as it discharges, so that table works. Lithium holds roughly 13.2V across 80 to 90 percent of its capacity, so a voltage-based gauge shows a full battery, then drops straight to empty with no warning in between.
Three of the batteries here solve this in the box. The LiTime, Redodo and DC HOUSE all report state of charge over Bluetooth, and the DC HOUSE goes further with per-cell voltage and current data. If you run lithium without an app, budget for a shunt-based monitor, which measures actual amp-hours consumed rather than inferring from voltage. This is the source of most confusion when anglers switch chemistry, and it is a gauge problem rather than a battery problem.
Group 31 fit, wiring and the checks that prevent returns
Physical fit is a frequent reason a correct battery gets returned, and it is worth ten minutes with a tape measure. A Group 31 case is nominally about 12.9 by 6.8 by 8.5 inches, but lithium cases in this roundup vary. The LiTime and Power Queen measure around 13 by 6.77 by 8.4 to 8.5 inches. The DC HOUSE is closer to a Group 24 at 10.2 by 6.6 by 9.2 inches, so it is narrower but taller. Measure the clear height of your battery box above the hold-down strap, not just the box itself, because the strap needs room to cross the case.
On wiring, 6 AWG is the sensible minimum for a motor up to 55 pounds of thrust, and 4 AWG is the right call for 80 pounds and above or for any run where the cable is long. Use marine-grade cable, marine terminals and a ring terminal crimped rather than a screw terminal, then coat the connection with dielectric grease. Secure the case firmly so it cannot move, because a battery shifting under way causes most marine electrical faults.
Three final checks before you leave the dock. Never mix lithium and AGM batteries in the same series bank, because the higher resting voltage of a full lithium cell pushes current into the lead-acid unit and drains it. Replace a series bank as a complete set with batteries of the same chemistry, age and capacity. And if your outboard starts from the same pack, keep a separate starting bank, because none of these batteries are built for the high current a starter draws.
One last piece of context for anyone building a house bank alongside a trolling bank. Deep-cycle capacity sizing for RVs is covered in more detail in our guide to the best deep cycle batteries for RVs, and the same usable-depth-of-discharge rules apply in both cases.
Frequently Asked Questions
What kind of battery should you use for a trolling motor?
Use a deep-cycle battery, not a starting battery, matched to your motor’s voltage: 12V for up to 55 lb of thrust, 24V for 56-80 lb and 36V above that. For all-day fishing choose LiFePO4, which delivers 80-90% of its rated capacity before voltage sags, versus about 50% for AGM. Size the bank on your average current draw at typical speed, not your maximum draw, and add headroom for spot locking.
How long will a 100Ah battery run a 55lb trolling motor?
On a 12V 55 lb motor averaging 15-20 amps, a 100Ah lithium battery delivers roughly 4-7 hours because you can use 80-90% of its capacity. The same 100Ah AGM gives closer to 2.5-3.5 hours, since only about half its rated capacity is usable. A 200Ah lithium bank roughly doubles both figures to 8-14 hours depending on how much of the day is spent at speed rather than drifting.
Is a 100Ah lithium battery enough for a trolling motor?
For a 36-55 lb thrust 12V motor on a typical 6-8 hour day, one 100Ah lithium battery is enough. For spot locking, a 36V/72 in shaft motor, or 10+ hours offshore, run two 100Ah lithium batteries in parallel for roughly 170Ah usable. Anglers running heavier 24V and 36V systems should use a 24V or 36V pack of 1280-1920Wh rather than doubling 12V units.
Which battery is better for a trolling motor, lithium or AGM?
Lithium iron phosphate wins on every performance measure: 80-90% usable capacity versus 50% for AGM, 4000+ cycles versus 400-700, and roughly a third of the weight. AGM wins on upfront cost, works with existing lead-acid chargers and needs no activation step. Choose lithium if you fish 6+ hours a day or care about bow weight; choose AGM if you need a drop-in setup with no charger change.
What size battery is recommended for a 55lb thrust trolling motor?
A 55 lb thrust motor runs on a 12V system, so a single 12V 100Ah battery is the starting point. To fish all day, run two 100Ah batteries in parallel, which gives about 170Ah usable on lithium. Follow the four steps: match voltage to thrust, estimate average draw at your typical speed, apply usable depth of discharge, then divide required amp-hours by usable capacity per battery.
Do lithium batteries hurt trolling motors?
No, with a correctly sized bank and a compatible charger. Trolling motor manufacturers did issue bulletins years ago warning about some motors being damaged by lithium’s higher amp delivery, so check your motor’s compatibility before switching. The risk comes from a lead-acid three-stage charger’s float stage cycling the BMS, not from the lithium chemistry itself. A lithium-profile or LiFePO4-compatible charger removes the concern entirely.
Is there a difference between a marine battery and a deep cycle battery?
They overlap heavily. Marine describes the application and the construction, including corrosion resistance, sealed terminals and vibration tolerance. Deep cycle describes the duty cycle: delivering steady current for hours at low-to-medium draw rather than a short high-current burst. A marine deep cycle battery is simply one built for both, and that is what a trolling motor needs, since it is never a starting battery.
How many amp hours does a Group 31 deep cycle battery have?
A Group 31 deep cycle battery is most commonly rated at 100Ah, though capacities from about 75Ah to 125Ah exist depending on chemistry and brand. A 100Ah Group 31 LiFePO4 stores around 1280Wh, while a 100Ah AGM stores around 1200Wh but only gives back about half of it before voltage sags. Group 31 refers to physical case size, not capacity, so always check the label.
The Verdict: Which Trolling Motor Battery Should You Buy?
For most anglers, the answer is a 12V 100Ah LiFePO4 battery, two of them in parallel if you want genuine all-day margin. Our first choice is the LiTime for its Bluetooth accuracy and long cycle rating. If you want a Group 24 case that drops into an existing box at 21 pounds, the MARSENERGY is the one we would buy. For saltwater and tournament work, the Power Queen’s ABYC E-13 certification and surge protector justify the step up.
Match the voltage to your thrust first, because that decision is not adjustable later. A 24V system at 70 to 100 pounds of thrust suits the BtrPower single pack or the Timeusb when you want room to build a bank. A 36V motor above 100 pounds of thrust has one clean option here, the Cymoye at 1920Wh. If you are not switching chemistry this season, the Weize AGM is a proven bank that works with the charger already in your boat.
Whatever you choose, budget for the charger. A lithium-profile onboard charger is the difference between a battery that performs as its datasheet claims and one that disappoints you at the ramp. Check the box dimensions, check the motor’s lithium compatibility, and then the best trolling motor batteries for all day fishing in 2026 will take care of the rest.
If you are still choosing the rest of the boat, our guide to the best fishing paddleboards for anglers covers the flat-water alternative to a powerboat setup.