Specific gravity is the density of the electrolyte fluid compared to water.
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The specific gravity for the electrolyte is ideally 1 265.
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A low specific gravity in one cell compared to other cells means it is dead.
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The best method to test a car battery for a dead cell is to check the specific gravity of the electrolyte fluid.
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Pulse load testers verify that a battery can deliver power by actually making it deliver power.
The duration and repetition of the load test cycle varies depending on the battery type being tested.
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