Choose a 12V LiFePO4 battery: capacity, BMS limits, cold charging and US packages

Start with energy and the continuous current limit

Rated amp-hours describe stored charge at a test condition the maker states; some pages also publish watt-hours, while others list only voltage and amp-hours. Treat an absent watt-hour figure as absent rather than multiplying it yourself. The catalogue records 100 Ah batteries from LiTime, Battle Born and Renogy and one 270 Ah Battle Born GC3, which is a different class of purchase, not a better version of the same battery.

The BMS continuous discharge current is the figure that caps what you can run. The 100 Ah batteries here are all rated at 100 A continuous, while the BBGC3 is rated at 300 A. Peak ratings last only for their stated seconds: LiTime publishes 280 A for 5 seconds and 400 A for 1 second on its basic Group 24, Battle Born publishes 200 A or 500 A for 30 seconds depending on the model, and Renogy publishes 245 A for 30 seconds. Size inverters and motors from the continuous figure and read the peak as a short tolerance.

Keep the charge limit separate

Charge current is a separate rating from discharge. LiTime and Renogy publish 100 A maximum charge for their 100 Ah batteries but recommend lower everyday currents, and Battle Born publishes 50 A maximum for BB10012 and 135 A for BBGC3 with a 0.5C recommendation. A charger that exceeds the maximum relies on the BMS to intervene. Match your charger, alternator charger or solar controller to the recommended current and to the charge voltage window the maker lists, and confirm it has a lithium profile.

Distinguish a cold cutoff from a heater

Cold charging must stay within the exact model's published limits; do not assume every battery has the same cutoff or heating features. Some batteries list no low-temperature protection at all, as the basic LiTime Group 24 does with its 0°C to 50°C charge range; the maker simply tells you to charge above 32°F. Others add a low-temperature cutoff that stops charging in the cold, which protects the cells but leaves the battery unable to charge until it warms. A self-heating battery adds an internal heater so charging can resume on its own.

Heaters come with conditions. The LiTime Self-Heating Group 24 heats between -20°C and 5°C, needs a charger of at least 10 A in its Regular mode, and offers an Energy-efficient mode that can draw battery power above 20% SOC. The Renogy Pro heater runs below 41°F only when a stable charge current above 4 A is present, and its manual also lists a charge cutoff at 32°F with recovery at 37°F. Battle Born publishes a cold charging cutoff and a 25°F to 135°F charge range for the non-heated BB10012 and BBGC3 and sells heated versions as separate SKUs. Never transfer a heating or cutoff feature from a similarly named variant; read the page for the exact version you are ordering.

Read cycle-life claims with their conditions

A cycle count is only comparable when it carries a depth of discharge and a retained-capacity endpoint. Renogy states 5,000 cycles at 80% depth of discharge to 80% end-of-life capacity. LiTime states 4,000 cycles at 100% DoD, 6,000 at 80% and 15,000 at 60% without naming a capacity endpoint. Battle Born states 3,000 to 5,000 cycles at 100% usable depth of discharge, also without an endpoint. These are maker claims under maker conditions, not independent tests, and none translates directly into years of service for your usage.

Check the case, terminals and weight for the exact package

A group-size statement is a claim about footprint. LiTime names BCI Group 24 for both of its models, Battle Born describes BB10012 as a drop-in for Group 27 and Group 31 and names GC3 for the 270 Ah battery, and Renogy publishes dimensions without a group size. Compare the published length, width and height with your tray, allow for cable clearance above the terminals, and keep any disagreement between a page and a manual visible rather than picking one number.

Terminals differ too. LiTime and Renogy use M8 bolt terminals and publish torque figures; Battle Born uses brass flag terminals with a 3/8 in hole and supplies 5/16-18 hardware. Weight ranges from about 21 lb for the basic LiTime Group 24 to 80.8 lb for the BBGC3, which changes how you mount, hold down and carry the battery.

Confirm the US offer before ordering

Several maker pages sell more than one battery under one title. Battle Born pages carry Non-Heated or Heated and Standard or Smart selectors, each with its own SKU. Renogy lists 100Ah and 200Ah options together with multi-packs and bundles, and only the 100Ah figures apply to RBT12100LFP-BT-US. LiTime sells the basic, Bluetooth and Self-Heating Group 24 batteries on separate pages and offers a kit with a charger beside the single battery. Record the SKU, the selector positions and the box list for the package you choose.

Series and parallel limits are also package facts: LiTime documents 4P4S, Battle Born documents series to 48 V with parallel as permitted by its installation guidelines, and Renogy documents parallel only, up to 8. Check the maker warranty document rather than the headline term, and follow the manufacturer requirements for fusing, wiring and charging. This catalogue records published specifications; it does not provide installation advice, a live price or a tested winner.