What's wrong with the normal battery voltage of electric vehicles?

A 12V battery is actually composed of six small 2V batteries connected in series. If a 12V battery can't measure the voltage, it's usually because the internal connection of the battery is disconnected and you can't handle it yourself. You can find a place to repair the electric car and replace your bad battery with his old one. 20-30 yuan should be ok, but your electric car battery has been used for more than 1 year.