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Message: <blockquote data-quote="tymoto21" data-source="post: 8497418" data-attributes="member: 589669">my brother had a battery that rested at 12.4v (lead acid), i put a standard 12v headlamp bulb on the battery and it instantly dropped to 9v.take it off back up to 12.4v.that is a bad cell, you cant measure it with a volt meter unless you put a load on the battery.also the battery can just put out less current.  If it cant start a car its probably junk</blockquote>

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