Li Ion Batteries 3.7V Rechargeable 26650 5000mAhUsage 1: notebook battery core replacement, high-grade strong light flashlight, mobile power supply, electronic cigarette, scanning gun, card swiping POS machine.Application 2: PHS telephone, walkie talkie, Bluetooth audio, portable fax machine, printer, digital camera, camera.Application 3: portable DVD, VCD, electric motorcycle power supply, electric bicycle power supply, electric drill, electric planer, medical equipment, etc.