How Many Volts Is Too Low For A Car Battery. If the reading is more than 13V for alkaline battery not rechargeable battery then the battery still has some juice left in it. Each battery is complete with 6 separate cells that each contains 21 volts for a total of 126 volts.
Even a worn battery will show higher than 126 volts right after being fully charged. At 10V and above you could probably still jumpstart the car and recharge the battery if it is found to be weak and your car wont start. Testing the battery state of charge with a voltmeter.
In the case of a 15 V this corresponds to 08 V and for a 9V battery about 54 V.
If the battery voltage with the engine off and headlights on drops from 126 volts to less than 11 volts in a couple of minutes the battery is weak. Ad Trust Volkswagen with Your Battery Service Today. Thats not enough to pull the voltage down on a healthy fully charged battery to 124 volts. What voltage is too low for a 9 volt battery.
