FTXJ 4PC Rechargeable 5800mAh Li-ion 18650 3.7V Battery for Flashlight lamp Torch Suitable for 18650 batteries . Battery Type: Rechargeable Battery (Not AA Battery) Voltage: 3.7v; Capacity: 5800mAh Material: Li-ion Battery Rechargeable times: Up to 1800 times Battery appliances such as your flashlights, emergency lighting, portable devices, power tools