What Are LiFePO4 33140 15Ah 3.2V Batteries? LiFePO4 (Lithium Iron Phosphate) 33140 15Ah 3.2V batteries are rechargeable cells designed for high-efficiency energy storage. With a cylindrical form factor (33mm diameter, 140mm height), they offer 15Ah… How to Build a Solar Power System with LiFePO4 33140 15Ah Batteries?