How To Test If My Car Battery Is Dead. There are numerous reasons a check engine light might come on a dead battery being one. The cells will either have individual caps or a plastic cover that clips over all or some of the cells.
2 reconditioning or refurbishing a dead cell. If the voltage reading is flat at 120v then your battery is flat dead. But some older batteries allow you to access the individual cells.
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2 Reconditioning or Refurbishing a Dead Cell. How to test a car battery for dead cells. To really make sure about the batterys condition the only way is to make sure that the battery is fully charged and then to do a load test this is done by putting a load on the battery while observing the voltage of the battery. Many new car batteries are of the sealed maintenance free variety.
