1 Li-ion 18650 battery pack 2 3.7V-4400mAh 3 CE,UL,SGS, ... Long cycle life>2000times 5 High discharge rate NoItemSpecification 1Model18650 Li-ion battery pack 2Nominal Capacoity4400mAh 3Nominal Voltage3.7V 4Size65.5*18. ... c 9Storage Temperature20--34°c10 Appro Weight 80g Advantage:Low interal resistanceLong recycle lifeEnviromental protectionSafeNo memory effect Li-ion 18650 4400mAh 3.7V battery pack