At what voltage is a 12v battery dead?

At what voltage is a 12v battery dead?

This is called the “open-cell” or “resting” voltage of the battery. Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it's about 50% charged.

How do I know if my 12 volt battery is bad?

If your battery is reading 0 volts, chances are the battery experienced a short circuit. If the battery cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. If the battery is fully charged (according to the battery charger) but the voltage is 12.5 or less, the battery is sulfated.

How can I test my battery?

Download an app meant to test the health of your battery, such as AccuBattery. Open the app and follow the instructions on the screen to set it up. Then use your phone as you normally would for at least a day.

Can you fix a shorted battery?

If the battery appears to be undamaged disconnect it from the car's wiring and try to charge it. If it won't take a charge it isn't repairable. If the battery shows physical damage from a short I would just scrap it.

How do I test a 12 volt battery with a multimeter?

Battery voltage readings will drop with temperature roughly 0.01 volts for every 10 degrees F.) (At 30 degrees F. a fully charged battery will measure about 12.588 volts, and at zero degrees F it will measure about 12.516 volts.)