Main Feature: 1. Type: Li-ion battery. 2. Capacity: 3100mAh. 3. Working current: 25A. 4. Woking voltage: 3.7V. 5. Sizer: 18*65mm. Package content: Set 1: 1pcs battery. Set 2: 2pcs battery. Introduction of 18650, 26650, 18350 lithium battery. 18650 battery: 18650 lithium battery use for power tools, flashlight, electronic cigarette, mobile power, miner’s lamp, fishing lights, laptop batteries, wireless data transmission, portable instrumentation, electric toys, portable printers, industrial equipment, medical equipment , Ship model, electric cars, electric bicycles, balance cars and so on. 26650 battery: 26650 lithium battery use for power tools, lighting, energy storage, electric cars, toys, instrumentation, backup power, communications equipment, medical equipment, military lights, new energy vehicles, electric bicycles, balance cars and so on. 18350 battery: 18350 lithium battery use for flashlight, electronic cigarette, electric toys, lighting and so on.