How Many Volts Fully Charged Car Battery. 147V is higher than youd usually meet but around 144V is common for topping mode charging which is used to equalise charge in series connected cells. The 12-volt battery needs 138 volts to be fully charged.
Testing the capacity of the battery with a voltmeter is more difficult. This is not the only discrepancy when it comes to total volts needed in a battery. If the battery is fully charged according to the battery charger.
The 12-volt battery needs 138 volts to be fully charged.
In this manner can you test a car battery. This tells you how many volts is a car battery while running. There are at least three variations of the lead-acid battery in current automotive use 1. State of charge 12 volt Standard Batteries Battery state of charge is determined by reading either terminal voltage or the specific gravity of the electrolyte.
