Short answer: compare LiFePO4 batteries on continuous BMS amps, low-temperature charge protection (or self-heating if you camp below freezing), cost per usable Wh, and warranty, before brand or looks.
| Spec | Why it matters | What to look for |
|---|---|---|
| BMS continuous current | Limits how big an inverter one battery can feed | ≥ your inverter's DC amps (a 2,000 W inverter on 12 V draws ~185 A) |
| Low-temp charge cutoff / heating | Charging LiFePO4 below about 32°F (0°C) can damage cells | Low-temp cutoff at minimum; self-heating for winter camping |
| Rated cycles | Lifetime cost | Check at what depth and end capacity cycles are rated |
| Monitoring | Know your real state of charge | Built-in Bluetooth or a separate shunt monitor |
| Series/parallel limits | Expanding the bank later | Maker's stated max in parallel and series |
| Certifications | Safety testing | Listings such as UL 1973 / UN38.3 as published by the maker |
| Warranty | Real-world support | Length, and whether it covers RV/mobile use |
Compare prices with the cost per usable Wh calculator, size the bank with the battery bank calculator, and check your charger, converter and alternator charging profiles are lithium-compatible.
See also: Best battery monitor for an RV.
Safety: These are general estimates, not a design. Follow your equipment manufacturer's instructions and local electrical code, and consult a qualified electrician for anything connected to shore power, a house, or high-current batteries.
Often you need a lithium-compatible converter/charger profile, and alternator charging usually needs a DC-DC charger. Check your RV converter's manual.
Only if you will charge below about freezing. Discharging in the cold is usually allowed to lower temperatures, but check the maker's limits.
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