Performance A. Perfect protection function. Over voltage /Over current /Short circuit /Reserve connection /Prevent to flow backward B. Over-heat protection C. Small volume, great shape. D. High reliability, few rate of re-repairs. Usage Before charging, you should put the output plug of the charger in the charging socket of the battery case at first, then put the input plug of the charger powering the power socket. When finishing it, draw the power socket firstly, next the output socket. 1. The indicator light of the charger: Red light: Normally charging Green light: Charge with small current or the process of charging has finished. The lights turn off: Power Input plug of the charger doesn't put in the power supply socket or there is no electricity 2. At the initial stage of charging, if the green light does't turn into red, it is the protection conditions of the charger, please check whether the battery is connected to the wrong directions and whether they are connected well. If not, please deal with it as there is something wrong.