Electric cars are full for four hours most of the time, and occasionally eight hours is not enough. What happened?

First, the charger may be faulty;

Second, the battery itself may fail;

Third, the charging cable may be faulty.

Solution 1:

There is no distilled sulfur water (sulfuric acid) in the battery. Just add it. If not, please replace the battery.

Solution 2:

Disassemble the charger and see if the fuse is blown. If it burns out, replace it with a fuse of the same specification. Besides, most people can't fix it.