What Voltage Should My Car Battery Be When Not Running. Each battery is complete with 6 separate cells that each contains 21 volts for a total of 126 volts. I assume this is the actual voltage of the battery right.

With the car running and voltage meter on the battery you are not seeing battery voltage. With the battery in the circuit it filters out this ripple in the 01 to 02 volt range and this is peak voltage. A clicking sound usually means low voltage.
Fully charged automotive batteries should measure at 126 volts or above.
With the battery in the circuit it filters out this ripple in the 01 to 02 volt range and this is peak voltage. A fully charged car battery voltage for a vehicle that isnt running should fall between 124 volts and 126 volts. Its not a matter of voltage but of capacity and power output. When the engine is running this measurement should be 137 to 147 volts.
