A car battery with a dead cell may or may not start a car.
A car battery is one of the oldest types of rechargeable batteries. Batteries wear out after time, but also can develop other faults, such as dead cells, when individual cells within the battery fail.
Operation
A lead acid car battery produces electricity through a chemical reaction. The average car battery produces approximately 12 volts of electricity from 6 battery cells. If one cell is inoperative, the battery cannot produce sufficient voltage.
Identification
A battery with a dead cell may appear fully charged, but it will not generate 12 volts of electricity. The most reliable way of testing a battery for dead cells is checking the specific gravity of the electrolyte in each cell.
Causes
Batteries subject to extreme vibrations often develop faulty cells. Sulfate build-up on individual battery plates can also lead to dead cells and new batteries can have dead cells due to defects in manufacturing.
Effects
A battery with one dead cell may start a car immediately after the car has been running (and charging the battery) or it may not start a car at all, but it will never reach a full 12.6 volt charge.
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