Short Answer: A DEESPAEK 36V 100Ah LiFePO4 battery typically lasts 5–8 hours under standard 500W loads. Runtime varies based on power draw, efficiency losses (10–20%), temperature, and discharge depth. For solar setups, it can power… How Many Hours Does a 36V Battery Last? A Comprehensive Analysis of the DEESPAEK 36V 100Ah LiFePO4 Battery