Your old battery can't be fully charged? Need a second battery to double your playtime? Then you should not miss this article. The voltage is especially important when choosing the right charger. The unit milliampere hours (mAH) indicates the amount of charge that can flow through the device in one hour. Your old LiFePO4 battery should not be disposed of with the normal household waste. Electrical and hardware stores offer yellow bins for proper disposal. And also the disposal points of the local waste management companies offer a disposal option.