How Many Volts In A Good Car Battery. Answer 1 of 4. Fully-charged most car batteries will measure at least 126 volts 130-132V for OPTIMA YELLOWTOPs but low voltage doesnt necessarily equal a bad battery.
A fully charged battery should read 126 volts or more with the engine off. Because of the way lead-acid batteries discharge its important that you test the battery after its been sitting for a period of time to get whats called the resting voltage. Recharge the battery and test it again later to see if its holding a charge.
Anything lower doesnt necessarily mean the battery is bad.
A fully charged car battery voltage ranges from. 1245-1254 volts means you have a 75 charge 1224-1229 is 50 charged and 1199-1206 volts is 25 charged. Normally a battery will be tested by making sure it is fully charged and then able to deliver a CCA current for a certain time - perhaps 1 to 2 minutes. Any voltage reading higher than 129 volts is a good sign that the battery has excessive voltage.
