In this guide, we reviewed 10 popular 3. 2V LiFePO4 battery options based on capacity, cycle life, pricing, use case, and overall value—so you can choose the right battery for your project. Some manufacturers included in this list are battery suppliers and OEM/ODM. Purchase instructions: This is KINREECELL 18500 3. 2 V rechargeable lithium-ion battery, which measures about 1. 8V 100Ah LiFePO4 Battery Group 31, KEPEAK Rechargeable Lithium Battery with 100A BMS, Up to 15000 Cycles, 1280Wh Higher Energy Density, Perfect for RVs, Van, Trailer, MotorHome, Boats ect. 5v Battery in Tactical Flashlights. Make sure you don't have a Tria 4x LHR4. Every 12V, 24V, and 48V lithium battery bank used in solar installations, RVs, marine systems, and electric vehicles starts here — with individual cells, each operating at 3.