What is the optimal charging voltage for a 36V battery? A 36V lithium-ion battery typically requires a charging voltage of 41.4V–42.5V (3.45V–3.55V per cell) for balanced performance and longevity. LiFePO4 batteries need 43.8V–44.4V (3.65V–3.7V per… Optimal Charging Voltage for a 36V Battery: Maximizing Performance and Lifespan