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The normal battery voltage is about 12.6 volts with no load. Anything much less than this indicates the battery is not fully charged or is degraded. The key to starting an engine though is what does this value drop to when you start to crank the engine. If the battery is weak and the engine does not crank, the voltage could drop below 10 volts. If your car has a voltmeter in the instrument panel, note the value without cranking and then when you do crank to see how much it changes.

Two six volt dry cells will produce 12 volts, but wont start a car.

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16y ago

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