300Ah 12V Self Heating Lithium Battery 3840Wh Cold Climate Winter Travel 150A Continuous

300Ah 12V Self Heating Lithium Battery 3840Wh Cold Climate Winter Travel 150A Continuous

Winter camping places a unique demand on batteries: below freezing, ordinary lithium batteries refuse to charge, and lead-acid batteries lose half their capacity. This 12.8V 300Ah LiFePO4 battery solves the problem with a built-in heating film that warms the cells before charging starts, so the pack charges normally even when the mercury drops well below zero.

With 3840Wh of usable energy and a 150A continuous rating, it is sized for serious cold-weather RVs - ski campers, ice fishing rigs and full-time winter travelers who run diesel heaters, electric blankets and inverter loads for days off the grid. The self-heating system, heavy-duty BMS and 31.5kg of Grade-A cells make this the winter workhorse of the WNRLN RV range.

Self Heating Below Freezing
When the cell temperature drops below 5 deg C and a charge source is connected, the BMS automatically routes current to the internal heating film before allowing the cells to accept a charge. The film warms the core of the pack to a safe charging temperature, then normal charging begins. You do nothing - the battery manages the sequence by itself, which prevents the lithium plating damage that permanently destroys unprotected batteries charged in the cold.

3840Wh of Winter-Grade Capacity
A 300Ah rating at 12.8V gives this battery 3840Wh of usable energy, and because it is lithium, the entire amount is available regardless of temperature down to -20 deg C discharge. A comparable 300Ah AGM bank would deliver only about half that and lose another 30% of its punch in deep cold. In practical terms this pack runs a diesel air heater through the night, powers a 12V fridge for days and still has reserve for morning coffee on a 1500W inverter.

150A Continuous Discharge
The 150A continuous rating feeds a 1500W inverter at full tilt with room to spare, and the 300A peak handles surge loads such as inverter startup and power tools. During discharge the pack operates normally in cold conditions down to -20 deg C, so heating is only needed on the charge side - exactly where lithium chemistry is fragile. This asymmetry is what makes the pack genuinely winter-grade rather than merely cold-tolerant.

Smart BMS with Heating Control
The BMS performs double duty: it protects the cells from over-charge, over-discharge, over-current and short circuit, and it governs the heating cycle with a dedicated temperature sensor on the cell core. Heating current is drawn from the connected charge source rather than from the battery itself, so the pack never drains itself to warm up. Once cells reach the safe window, the BMS switches from heating to charging automatically.

Why Self Heating Matters for Lithium Owners
Charging a lithium battery below 0 deg C causes metallic lithium to plate on the anode, which permanently reduces capacity and creates a long-term safety risk. Many budget lithium batteries simply block charging below freezing, which leaves winter campers with a dead battery and no way to recharge from solar or the alternator. The built-in heater in this pack removes that limitation: charge current warms the cells first, then fills them. It is the difference between a battery that works in winter and one that only survives it.

Best Applications in Cold Climates
This pack targets ski-resort campers, ice fishing shelters, winter overlanders and full-time RV residents in northern states and Canada. It also suits off-grid cabins that sit unheated for weeks and then need to recharge from a generator in freezing weather. Pair it with a 30A or 50A DC-DC charger or 400-600W of solar; both charge sources trigger the heating sequence automatically when temperatures are low.

Built for Real Winter Service
Every component is chosen for cold service: low-temperature-grade cells, a sealed ABS case that keeps snowmelt and condensation away from the terminals, and M8 studs that stay corrosion-free with standard terminal protection. The pack mounts in any orientation except fully inverted, which gives installers freedom in tight ski-camper compartments. A 3-year warranty covers the heating system as well as the cells and BMS.

Long Service Life in Hard Conditions
Grade-A cells rated for 4000 cycles at 80% depth of discharge mean the battery outlasts several winters of hard use. Because the heating system prevents cold-charging damage, the pack does not suffer the silent capacity loss that shortens the life of unprotected lithium batteries used in winter. Owners who keep this battery for a decade typically replace their diesel heater twice in the same period.

Factory Options for Cold-Climate Brands
We supply this winter battery to RV OEMs and cold-climate distributors with custom branding, adjustable heating thresholds and optional insulated blankets for extreme arctic use. The heating threshold can be tuned in the BMS for customers who operate in milder winters and prefer to save every watt of heating energy.

Frequently Asked Questions

Q: How much energy does the heater consume?

A: The 40W heating film runs only during the pre-charge warm-up and draws its power from the charge source, not from the battery's stored energy. In typical winter conditions the warm-up phase lasts 15 to 40 minutes depending on how cold the pack is, which is a small overhead compared with the charge that follows.

Q: Can I install this battery in an unheated compartment?

A: Yes, and that is exactly the use case it was designed for. The heater and BMS handle cold starts automatically, so the battery does not need to live in the heated part of the RV. Keep the compartment dry and allow airflow around the case for the temperature sensor to read accurately.

Q: Does the heating feature also protect the battery while discharging?

A: Discharging below freezing is safe for LiFePO4 cells down to -20 deg C, so the heater is not needed during discharge. The BMS only activates heating when a charge source is connected and the cells are below the 5 deg C threshold. This keeps the system simple and efficient.

Q: What charge sources can trigger the heating cycle?

A: Any charge source works: solar controllers, DC-DC chargers, converters and generator chargers. When the BMS detects incoming charge voltage and cold cells, it performs the warm-up sequence first. After the cells reach the safe temperature, charging proceeds normally to the 14.6V absorption set point.

WNRLN winter batteries are backed by a 3-year warranty that includes the heating system, plus full technical support for cold-climate installers. Contact our export team for the winter battery price list, samples and OEM heating configuration options.