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Message: <blockquote data-quote="jockhater2" data-source="post: 7910400" data-attributes="member: 636023">You can wire 2 batteries of different size together. But from what I heard. If they are not of similar age. It was shorten the life of the newer one.And as long as the size is kinda close. You will be fine.You wouldn't want to wire the 2nd one to the alternator especially if its going to be in your trunk. That's a 15+ foot charging cable. Just wire them together. Probably upgrade the front battery as well.</blockquote>

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