... flashingBattery low protection, over load protection, short circuit protection with " ! " light onBATTERY CAPACITYFrom left to right 4 indicator means 100%, 75%, 50 ... 50% →75% → 100% every 1second means "CONSTANT CURRENT"Indicator flash change from 50% →75% → 100% every 2second means ... "CONSTANT VOLTAGE"Indicator 50%/75%/100% 3lights on means "FLOAT CHARGE" & battery ...