What Voltage Is A Car Battery Dead. Its a good idea to write down the reading. But when I connect the battery to the USB Charger to charge the dead battery which was at 28V the voltage line reads 46V.
A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery. Therefore it is believed to be one of the most important components of any vehicle. Here are some reasons that lead to the cells of the car battery to run out.
Then compare it to the voltage figures below.
Consider your car battery charged at 124 volts or higher and discharged at 1239 volts or less. If the battery cannot reach higher than 105 volts when being charged then the battery has a dead cell. Answer 1 of 5. If the battery is continually going flat it could be because of a parasitic loss.
