... from overtime, overheat, overcurrent, short-circuit3. Charge & discharge battery indicator function, easy to use4. Lighting and SOS function ... from overtime, overheat, overcurrent, short-circuit3. Charge & discharge battery indicator function, easy to use4. Lighting and SOS function ... 2V voltage2. Lighting and SOS function 3. Charge & discharge battery indicator function, easy to use4. Input: Micro USB ...