Chargers with high current charge fast but harm the battery, and chargers with low current (preferably with a pulse type charger) charge more slowly but good for the battery. The charging current of the car battery is about 2-3A, the current of the car charger mobile phone, look at the car charger model, generally 500-1000mA. The car on the market is basically used on the 12V, that is, the car, if it is easy to burn on the 24V, generally speaking, it does not use the car charger to cooperate, it belongs to the micro power consumption product working current is generally 50-70 MA.