What should a new 12-volt battery read when fully charged?
What should a new 12-volt battery read when fully charged? about 12.6 to 12.8 volts Check the reading. A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape. Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage. Why does my new battery drain so fast? A lot of things can cause your battery to drain quickly. If you have your screen brightness turned up, for example, or if...