If your car battery is not starting up, there is a good chance that one of the cells in the battery has died. There are a few ways to tell if this is the case:

  1. If you have a voltmeter, you can check to see if the voltage across each cell is within a certain range. If one or more cells are significantly lower than the others, that may be an indication that a cell has died.
  2. You can also try to start your car with just the battery cables connected and see if it will turn over. If it doesn’t, then one of the cells in the battery may have died.
  3. Finally, you can try to charge your battery up and see if it will start up again. If it does, then one of the cells in the battery may have died. ..