... . When charging,LED 1,2,3,4 circularly light on. After unit full charged,LED1,2,3,4 ... (1)there have 0%-25% power when first LED light on. (2) there have 25%-50% power when second ... 75%-100% power when fourth LED light on.Press buttom,LED will show how much power that battery charger have.Smart ... chip will hold LED for five minutes light on.Test ...