1)For Li-ion 18650 14.8V 4.8Ah (71Wh side by side) battery 2)Voltage: 14.8V (working) 16.8V ( peak) 11.0V ( cut-off) 3)4800 mAh min. (71 wh) 4)Protection: One PCB (8 A) installed with the pack and protects the battery from Overcharge (>16.8V) Overdischarge ( < 11.0 V) Over drain ( > 8 Amp) Short circuits 5)Dimention: 147.32 x 71x 20mm (Length x wide x height) 6)Weight: 380 g 7)Application: Can replace most of NiMH battery pack for dive light can replace almost every bike lighting system on the market.