... 5-6 hoursUseful time: >500 timesIndicator: 4LED show status of power:25%,25%~50%,50%~75%,75%~100% Light: 1LED ... shell lithium-ion battery Advatage: safe, efficient, durable electric power, easy to carry and removal, useful for all usb ... overcharge protection, over-discharge protection, short circuit protection; Accessories: power adapter, connect line, 7pcs charging head; Application: can be ...