Can You Use a Lithium Battery on a Boat Lift?
Quick answer
Only if the lift's motor maker allows it, and two widely sold DC lift motors (Lake Lifter and Lift Tech Marine) say they do not recommend lithium and want lead-acid or AGM. Where the maker is silent, a LiFePO4 battery works when its BMS current limit covers the motor, the solar controller has no temperature compensation or equalize stage, the battery will not need to charge below about 25 to 32°F, and it is rated for series use on a 24 V lift.
On this page
- Why one camp says "buy lithium" and the makers say no
- Check 1: can the battery deliver the motor's current?
- Check 2: what voltage does your charger use?
- Check 3: will it need to charge below freezing?
- Check 4: 12 V or 24 V?
- What lithium actually buys you on a lift
- Winter storage is where the two chemistries part ways
- Decision table
- Frequently asked questions
- Sources and further reading
You can put a lithium iron phosphate (LiFePO4) battery on many DC boat lifts, but not all, and the first thing to check is the motor, not the battery. The listings for Lake Lifter's DC direct drive motors and Lift Tech Marine's DC motors carry the same sentence: "At this time, we only recommend using Lead Acid or AGM batteries for all of our boat lift motors. We do not recommend the use of Lithium batteries." If your lift runs one of those, the answer is a deep-cycle lead-acid or AGM battery.
If your motor maker is silent, lithium can work well, provided four data-sheet numbers line up: the current the battery's management system (BMS) will deliver, the voltage your solar controller charges at, the coldest temperature the battery will charge at, and whether it may be wired in series.
- Makers that say no: Lake Lifter and Lift Tech Marine DC lift motors (lead-acid or AGM only)
- BMS current limits: 100 A continuous on both 100 Ah batteries checked; peaks of 200 A for 30 seconds (Battle Born) or 7.5 seconds (RELiON RB100-LT)
- Coldest charge: 25°F for an unheated Battle Born; the heated RELiON RB100-LT charges down to -4°F
- Charge voltage ceiling: 14.7 V on Battle Born, exceeded by a temperature-compensated lead-acid charger below 77°F
- Weight: 28 to 31 lb against 55 lb for a Trojan 27TMX flooded battery
Safety: a shorted 12 V battery can deliver enough current to melt a wrench or a ring. Disconnect the negative lead first, and never stand or reach under a raised boat while you swap the battery or test the lift. Any AC charger or dock circuit is work for a licensed electrician (see boat lift electrical).
Why one camp says "buy lithium" and the makers say no
Both answers are partly true. Battle Born rates its BB10012 at 3,000 to 5,000 deep cycles, 100% usable depth of discharge and 2 to 3% self-discharge a month, while Trojan tells owners not to take its flooded deep-cycle batteries past 80% depth of discharge.
The makers that say no publish no reason. Their listings do show the motors manage current themselves (Lift Tech lists "Soft Start" and "Backwind and Upper Amp Limit Sensor Protection"), and a lithium battery adds a second current manager, its BMS, that shuts the battery off at its own limits. Whatever the reason, follow the instruction on those motors. On other lifts, cycle life, the headline lithium number, turns out to matter least, as the worked example shows.
Check 1: can the battery deliver the motor's current?
A lead-acid battery has no switch inside: overload it and the voltage sags, but current flows. A LiFePO4 BMS disconnects the battery past its limit, and the lift stops mid-travel.
| Limit | Battle Born BB10012 | RELiON RB100-LT |
|---|---|---|
| Maximum continuous discharge | 100 A | 100 A |
| Peak discharge | 200 A for 30 seconds | 200 A for 7.5 s (plus or minus 2.5 s) |
| Very short surge | 0.5 second for loads over 500 A | Over-current trip at 280 A (plus or minus 50 A) after about 32 ms |
| Low-voltage cutoff | 10 V (recommended disconnect 10.5 V) | 9.2 V after about 4.7 s (recommended disconnect 11.0 V) |
So what does your lift draw at full load and at start-up? Most DC lift makers do not print it. Battery-powered hydraulic lifts are the clearest warning: ShoreMaster tells owners of its vertical hydraulic lifts to supply "a 12V group 27 marine deep cycle battery with minimum 500 CCA." Cold cranking amps is a starting-current rating, and 500 is five times the 100 A continuous limit above. That does not prove the pump (see hydraulic boat lifts) draws 500 A, but the maker specified the battery by current, not amp-hours. Ask the maker for the peak draw before you swap.
For cable winch lifts, the AC vs DC motor guide works out a running draw of about 31 A for a small 12 V lift and 73 A for a larger one. Both fit under 100 A continuous, but the larger leaves little room for start-up current or a stiff winch. If the lift stops dead partway and the battery reads normal a few seconds later, the BMS tripped; a weak lead-acid battery slows the lift first (see solar and battery problems). A boat left hanging by a tripped battery can be brought down by the methods in lowering a lift without power.
Check 2: what voltage does your charger use?
Battle Born specifies 14.2 to 14.6 V absorption, 13.4 to 13.8 V float, temperature compensation "No/Disable" and BMS high-voltage protection at 14.7 V. Victron's non-programmable BlueSolar PWM-Light charges at a fixed 14.2 V and 13.8 V, inside those ranges: the voltages matter, not whether a controller has a lithium setting.
The trouble is temperature compensation. Trojan's flooded charging table gives 2.45 V per cell absorption at 77°F, compensated by 2.8 mV per cell per degree Fahrenheit, rising below 77°F.
Worked example: a lead-acid charger on a cold spring morning
- Base absorption: 2.45 V x 6 cells = 14.70 V at 77°F. That is already Battle Born's 14.7 V protection limit.
- At 50°F: 27 x 2.8 mV = 75.6 mV per cell; x 6 = 0.45 V; charge voltage 15.15 V.
- At 32°F: 45 x 2.8 mV = 126 mV per cell; x 6 = 0.76 V; charge voltage 15.46 V, past the RELiON RB100-LT's 15.4 V BMS charge cutoff.
- Trojan's equalization voltage, 2.70 V per cell, is 16.2 V on a 12 V battery.
On that charger a lithium battery is cut off by its own BMS on every cool sunny day, while the lift keeps drawing it down.
The rule: if the controller compensates for temperature or equalizes and neither can be turned off, replace it with one that has a LiFePO4 setting. Sizing is in the solar boat lift charger guide, and what the controller does is defined under solar charger in the glossary.
Check 3: will it need to charge below freezing?
LiFePO4 batteries discharge in the cold but must not charge when cold. Battle Born explains that charging in extreme cold causes lithium plating, and its batteries "will not allow a charge if their internal temperature is less than 24°F." The BB10012 data sheet lists the charge range as 25°F to 135°F and the discharge range as -4°F to 135°F.
In ice country that bites in spring and fall: the BMS blocks charging on cold mornings while the lift still runs. Heated batteries solve this, with a catch a small lift panel exposes:
- RELiON RB100-LT: charge range -4°F to 113°F, with a heater that works from -4°F to 41°F. RELiON lists a heating time of about 1 hour at 10 A. ShoreStation's 20 W lift charging kit (HA0110) is rated at 1.12 A at maximum power, about one ninth of that.
- Battle Born BB10012H: the heater switches on at an internal temperature of about 35°F and draws 28 W continuously while enabled. A 20 W panel cannot supply 28 W even at its rated peak.
A heated battery needs a panel sized for the heater as well as the lift. In Florida the cold limit rarely matters but the hot one can: the RB100-LT charges only up to 113°F, so shade the battery box.
Check 4: 12 V or 24 V?
Lake Lifter's listing describes "a 12v DC setup (single battery) or a 24v configuration (two batteries connected in series)" and says "optimal performance is achieved with a 24v setup, effectively doubling the motor's speed." Lift Tech lists 38 to 42 RPM at 12 V and 78 to 82 RPM at 24 V (motor basics are in boat lift motors).
Not every lithium battery can be stacked. Battle Born allows series wiring up to 48 V; the RELiON RB100-LT data sheet lists "Maximum Batteries Connected in Series: 1 (Single-Use)," so two of them cannot make a 24 V lift battery.
What lithium actually buys you on a lift
Worked example: a 4,500 lb pontoon lift at 12 V
Assumptions: 3 to 4 Ah per round trip (from the AC vs DC guide), a Trojan 27TMX (105 Ah at the 20-hour rate) against a 100 Ah LiFePO4.
- Lead-acid at 50% depth of discharge, the site's planning figure: 105 x 0.5 = 52.5 Ah, or 13 to 17 round trips with no sun.
- LiFePO4 at 80%, as the solar charger sizing tool does (Battle Born rates 100%): 80 Ah, or 20 to 26 round trips with no sun.
- Cycles per year: 300 round trips x 3.5 Ah = 1,050 Ah, about 10 full cycles of a 100 Ah battery. A 3,000 to 5,000 cycle rating is centuries of lift use, so it is not what decides battery life (see component lifespan).
- Weight: 55 lb for the 27TMX against 31 lb (BB10012) or 27.9 lb (RB100-LT), 24 to 27 lb less to carry on and off the dock.
The real gains: about 50% more cloudy-week reserve and half the weight.
Winter storage is where the two chemistries part ways
| Step | Flooded or AGM lead-acid (Trojan) | LiFePO4 (Battle Born) |
|---|---|---|
| Before storage | Charge fully | Charge fully |
| Charging during storage | Recharge when flooded falls to 70% state of charge, AGM or gel to 75% | Not needed: disconnect solar and every charger |
| How often to check | Flooded every 4 to 6 weeks; AGM or gel every 2 to 3 months | Data sheet: still 75 to 80% charged after six months |
| Cold | Can freeze if not fully charged; never charge a frozen battery | Store above freezing if possible; bring indoors if below -10°F is expected |
Lead-acid freeze risk is a matter of charge. Trojan's table, from the Battery Council International service manual, puts the electrolyte freezing point at -92°F at a specific gravity of 1.280 (about full) but 19°F at 1.100 (roughly 20% charged), so a flat flooded battery can freeze on an ordinary winter night. Off-season steps for the rest of the lift are in winterizing a boat lift.
Decision table
| Your situation | Choose | Why |
|---|---|---|
| Lake Lifter or Lift Tech Marine DC motor | Lead-acid or AGM | The maker does not recommend lithium |
| Battery-powered hydraulic lift specified by CCA | Lead-acid or AGM, unless the maker approves a lithium battery and gives the pump's peak draw | The maker specifies current, five times a 100 A BMS rating |
| Solar controller with temperature compensation or equalize that cannot be turned off | Lead-acid, or replace the controller first | Charge voltage climbs past the lithium BMS limit in cool weather |
| Ice country, lift used in spring and fall, small panel | Lead-acid or AGM, or heated lithium with a bigger panel | Unheated lithium will not charge below about 25°F; a heater can outdraw a 20 W panel |
| 24 V lift | Lithium only if the data sheet allows series wiring | The RB100-LT, for one, is single-battery only |
| Maker silent, compatible controller, mild climate, battery carried on and off the dock | LiFePO4 makes sense | About half the weight and more usable capacity per amp-hour |
Where this stops applying: AC lifts have no battery to choose. Everything here concerns LiFePO4 batteries with a built-in BMS, and the two used are examples: other models have other current, temperature and series limits. A lift maker that approves a specific lithium battery overrides these general checks.
Frequently asked questions
Can I put a lithium battery on a solar boat lift?
Often, but check the motor maker first: Lake Lifter and Lift Tech Marine do not recommend lithium for their DC lift motors. Elsewhere, the BMS must cover the motor's current, the controller must not use temperature compensation or equalize, and an unheated battery must not need charging below about 25°F.
Why does my lithium battery stop the boat lift halfway up?
Most likely the BMS disconnected it for over-current. The 100 Ah LiFePO4 batteries checked here allow 100 A continuous and 200 A for 7.5 to 30 seconds. If the lift stops dead and the battery reads normal a few seconds later, the motor draws more than the BMS allows; a lead-acid battery or a larger lithium bank fixes it.
Can a lithium boat lift battery stay on the dock all winter?
It is better off the dock. Battle Born says to charge fully, disconnect solar, chargers and loads, store above freezing if possible, and bring batteries indoors if below -10°F is expected. It is still 75 to 80% charged after six months, so it needs no maintainer.
Is a lithium battery worth it for a boat lift?
On a compatible lift that runs flat in cloudy weeks, or where the battery is carried on and off the dock, often yes: about half the weight of a group 27 flooded battery and more usable capacity. The long cycle life matters little, because a lift uses about 10 full cycles a year.
Sources and further reading
- Battle Born Batteries, BB10012 100 Ah 12 V LiFePO4 Deep Cycle Battery data sheet: current, voltage and temperature limits, storage, series limit, weight, BB10012H heater (https://battlebornbatteries.com/cdn/shop/files/BB10012_Data_Sheet.pdf)
- Battle Born Batteries, "How to Winterize and Store LiFePO4 Batteries": lithium plating, 24°F charge block, storage (https://battlebornbatteries.com/faq-how-to-winterize-your-batteries/)
- RELiON Battery, RB100-LT data sheet (03.16.23): current limits, charge cutoff, heater, series limit, weight (https://defender.com/assets/pdf/relion/relion-data-sheet_rb100-lt.pdf)
- Trojan Battery Company, User's Guide: flooded charging and temperature compensation (Table 5), storage, electrolyte freezing points (BCI Service Manual), 80% depth of discharge limit (https://cdn.shopify.com/s/files/1/0656/3128/9563/files/Trojan_User_Guide.pdf)
- Trojan Battery Company, 27TMX 12 V flooded battery specifications: 105 Ah at 20-hour rate, 55 lb (https://trojanbattery.com/product/27tmx)
- Victron Energy, BlueSolar PWM-Light Charge Controllers 12/24V data sheet: absorption, float and load disconnect voltages (https://nomadicsupply.com/wp-content/uploads/2026/05/victron-datasheet-bluesolar-pwm-light-charge-controllers-12-24v-en.pdf)
- Boat Lift and Dock, Lift Tech Marine DC 12v/24v motor LT-DCM100 and Gen 2 DC direct drive listings: battery recommendation, RPM, protection features (https://www.boatliftanddock.com/product/2459/lift-tech-marine-dc-12v24v-key-operation-lift-motor-lt-dcm100)
- Boat Lift and Dock, Lake Lifter direct drive boat lift motors: battery recommendation, 12 V and 24 V configurations (https://www.boatliftanddock.com/productgroup/645/lake-lifter-direct-drive-boat-lift-motors)
- ShoreMaster, Vertical Hydraulic Lift FAQ: battery requirement (https://www.shoremaster.com/boat-lifts/lift-models/vertical-hydraulic-lift/)
- Boat Lift and Dock, ShoreStation 12V Solar Charging Kit HA0110: 20 W panel, 1.12 A maximum power current (https://boatliftanddock.com/product/4909/shorestation-12v-solar-charging-kit-ha0110)