How To Tell When Car Battery Is Charged. If your battery is not fully charged try recharging it with a quality 12V battery charger. The voltage should be somewhere between 128V and 147V.
The voltage should be somewhere between 128V and 147V. Place the black lead on the negative terminal. The small red triangle shows the amps flowing on the 2 amp setting.
A car battery is normally measured in voltage.
You may need to use jumper cables to get it started. Test the battery voltage. Eventually the level of battery charge diminishes to the point where no matter how much power the alternator gives to it the battery cant hold enough power to. The needle moves to the left and into the green area.
