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Message: <blockquote data-quote="b8sah0l1c" data-source="post: 6374711" data-attributes="member: 602222">if you have 2 batteries and 1 of them you know for sure is dead but haven't disconnected it yet. will it cause the other battery to not hold charge.  i ask because i have a brand new interstate battery i use for starting battery.  the second one is a old school lightning storm battery in the trunk.  i know for sure the lightning storm battery is dead. i just never get around to replacing it. plus i have to find one that is the same size as well because of a custom installed.thanks</blockquote>

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