. "Battrey... ... more Product Info Topwell?? 4 x 3.7V 18650 3600 mAh Li-ion Rechargeable Battery + 18650 USA Plug Cord Smart Charger More Features: ??? Suitable for Flashlight Torch/headlamp/In daily life. ??? Durable in low and high temperature operations. ??? Energy-saving and safe; environmentally friendlly. ??? Fit for camera, watch, calculators and other electronic devices." . . . .