Brand: LG ChemModel: HE4Size: 18650Chemistry: INRNominal Capacity: 2500mAhNominal Voltage: 3.6VDischarge: 20A Max ContinuousPositive: FlatProtected: NO, UNPROTECTEDRechargeable: YesDimensions: 18.28mm x 64.98mmWeight: 45.6g