How to charge two batteries of a truck?

1, charging in series. The series voltage of two 12V batteries is 12V, and 27V should be used for constant voltage charging, because the fully charged voltage of the battery is higher than its rated voltage; It is best to charge with a constant current with a single battery capacity of110 (a).

2. Battery is a kind of battery, also called battery. Its working principle is to convert chemical energy into electrical energy. The storage battery usually refers to lead-acid storage battery, which is mainly made of lead and its oxides as electrodes and sulfuric acid solution as electrolyte.