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Measure the voltage at the battery posts with a volt meter. 6-volt batteries are generally approximately 10 inches in length, 7 inches in width and 11 to 17 inches in height.

Or count the cells. A 6V car battery should consist of three sections AKA cells, while a 12V battery will consist of six sections. These are usually visible from outside, either throught the casting of the casing or sometimes even through the location of the filler caps.

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Q: How do you know if a battery 6 or 12 volts?
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