How to open a 12 volt battery pack
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Measuring the voltage of a 12-volt battery is a quick and easy way to determine its state of charge. A fully charged 12-volt battery should read between 12.4 to 12.8 volts on a voltmeter. If the battery reads above 12.9 volts, it is considered to be overcharged, and if the battery reads below 12.4 volts, it is considered to be undercharged.