Separate charge
When the charger only has a charging output of 12V, the battery packs can only be charged one by one at this time. For the sake of safety, it is suggested to disconnect the positive and negative output lines of the battery pack and charge the batteries one by one. Each battery can be continuously charged, but the positive and negative poles must be distinguished.
The whole battery is fully charged.
When the whole battery pack needs to be charged, the battery pack can be charged with a charger with a corresponding charging voltage. At this time, the anode and cathode of the charger and the anode and cathode of the battery pack can be directly clamped.