How To Tell If Car Battery Has Dead Cell. To test each cell you need a hydrometer-style battery tester that measures the specific gravity of the battery acid. If any cell shows a specific gravity more than 005 less than the others the cell is dead and the battery will have to be replaced.
It is important to identify a dying battery before it goes off completely and take measures accordingly and in time. If the cables are look frayed are wiggly or are falling apart. A 12-V car battery has six cells and each cell is all giving voltage and amperage.
To test each cell you need a hydrometer-style battery tester that measures the specific gravity of the battery acid.
If your battery is on charge and still reads 105V or so theres a dead cell in your battery. To check if the car battery has a dead cell all we need to do is check the voltage between the terminals. Repeat the specific gravity test for each cell of the battery. Before we can recondition a car battery we need to know first the signs on how to spot the dead cell in a car battery.
