hand crank generator battery battery car emergency charging high power 12v2000W is_customized : Yes Model Number : 0 is_customized : Yes Explain here. To charge a 12 volt battery, you need to charge it with 14 volts. Charging a 24 volt battery requires a 28 volt charge. It is not a 12-volt battery that is charged with a voltage of 12 volts. It can't be charged with a voltage of 12 volts. A 12-volt battery shoots a 14-volt generator, and a 24-volt battery takes a 28-volt generator. 12V battery =
