1)For Li-ion 18650 11.1V 5200mAh battery 2)Voltage: 11.1V (working) 12.6V ( peak) 7.5V ( cut-off) 3)Capacity: 5200 mAh ( 58 wh) 4)Protection: One PCB (8A) installed with the battery pack and protects the battery from Overcharge (>12.6V) Overdischarge ( < 7.5 V) Over drain ( > 8 Amp) Short circuits 5)Imention: 63.5 x 53.34 x 35.56 mm (Width x Thickness x Length) 6)Weight: 290 g 7)Application: Use for RC toyexternal battery etc. 8)Use for bike light and diving lights