Car battery voltmeter 01 LM324
Electronic
see also
Car battery voltmeter 01

Car running

A perfect voltage (without any devices or electronic systems plugged in) is between 13.7 and 14.7V.

If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only operating at 25%,

and up to 11.9V when it’s completely discharged.

Engine OFF

12.66v . . . . . . . . . . 100%
12.45v . . . . . . . . . . 75%
12.24v . . . . . . . . . . 50%
12.06v . . . . . . . . . . 25%
11.89v . . . . . . . . . . 0%