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In an battery containing a liquid, such as a car battery, you could either measure the density of the sulphuric acid with a hydrometer, or you could conduct a cranking test.

Dry cell batteries do not usually show a significant voltage drop until they are near the end of their life. One can roughly estimate this by creating a small drain, but this will, by definition, drain the battery if left on too long.

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15y ago

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