Tenergy's rechargeable batteries for solar lights are designed to withstand outdoor temperatures and the charging demands of solar lights. Customers looking for the best value can choose between 1.2 volts Nickle-metal Cadmium (NiCd) or 1.2 volts Nickle-metal Hydride (NiMH) rechargeable batteries. For customers replacing their 3.2 volts 14500 size batteries, Tenergy offers a lithium iron phosphate battery (LiFePO4) for solar lights that requires 3.2 volts rechargeable battery.