Using top quality Panasonic Cells, German designed and manufactured battery pack for high quality and safe performance! German engineering means top-quality, exceptional performance, with safety a top priority. Built with Panasonic cells. Includes battery pouch and straps.Specifications:Battery：418650 Li-ion battery (8.4V4.5AH)Battery life:500 times cycleCharger：DC 8.4V/1.8ACharging time：3-3.5 hoursDischarging current：≤4AWaterproof rubber coatedSize：484896 MMN.W.：190g plus pouch 30 gramsCompatible with all MagicShine 8.4V bicycle lights: MJ-808, MJ-808E, MJ-816, MJ-816E, MJ-818, MJ-872.Warranty: 180 days manufacturer warranty.