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Your question needs clarification. Car battery, Cell phone battery, camera battery, etc.
Question was posted in car batteries category.
You can check it with a digital volt meter car not running. Set the meter to 20 volts DC. Here is what you will see.
12.6 volts = 100% charge
12.4 volts = 75% charge
12.2 volts = 50% charge
12.0 volts = 25% charge
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∙ 11y ago
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