before you connect the charger into 220V power supply, then output the Red clamp clamp on the battery positive pole, black clip on the battery negative pole and reliable connection, lights turned red when red to green (or light starts to blink), indicating that most of the power is fully into maintenance charging small current (positive and negative pulses or repair status). Float charge maintenance (repair or pulse) after about 30 minutes, charging can be ended. When charging is complete, first disconnect the charger power supply, and then remove the clip. (On the positive and negative pulses fix: this charger contains positive and negative pulse fix, in the late charge to the battery through the positive and negative pulses to repair, but each battery to be positive and negative pulse repair, do not need repair, or we can't fix battery, charging directly into green floating at the end.