What Should A 12 Volt Battery Read When Fully Charged. If your voltmeter is showing a voltage anywhere between 124 and 128 that means your battery is in good shape. If your voltmeter is showing a voltage anywhere between 124 and 128 that means your battery is in good shape.
If it reads 126 volts the battery is just attaining a fully charged state. A green dot tells you the battery is 75 percent or more charged. In reality the amount is not exactly 12 volt.
A reading of 1210 volts means that it is halfway.
A fully charged battery will typically display a voltmeter reading of about 126 to 128 volts. Each 12 volt battery has 6 cells at 212 volts per cellwhen fully charged. If the battery is reading at 124 volts then its 75 charged. A green dot tells you the battery is 75 percent or more charged.
