Lightweight, compact, high-performance Lithium-ion battery pack. The five-step LED power status indicator shows accurately remaining battery capacity. Industry-standard Power Tap can fit on-board Camera Light. Built-in intelligent IC circuit control, protection for over-charge, over-discharge, over current, short circuit and non-equilibrium an unconventional situation. Non-memory effect. Environment-friendly: No poisonous elements such as hydrargyrum and cadmium, etc.