Product description: IFR 18650 Li-ion battery with capacity:1100mAh. Feature: 1) High quality and operating voltage 3.7V Li-ion rechargeable battery. 2) Original appearance and built-in PCT with function of over-circuit protection PCB life is around 10 years. 3) With explosion-protection cap 4) Light weight, higher energy density, small volume. 5) Longer service life, 1C for circulation using 400 charge/discharge cycle, capacity above 80% 6) Low self-discharge 7) No memory effect 8) Safer and environmentally friendly. Application: LED flashlight, electric meter, medical machinery, wireless communication, lifesaving appliance, petroleum drill, research instrument, camera, note book computer, digital products, mobile phone etc. Dimensions:18.4*65.0mm