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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8257274" data-attributes="member: 576029">first, don't wire the batteries in series - that will fry the car's electronics.in parallel, the stronger battery will be pulled down by the weaker one.  if both float around the same voltage, paralleling them can be ok if they are the same type (both AGM).is it a height issue with the front location?  you can get a marine battery box and probably gain some room by removing the stock battery mounts and tray.</blockquote>

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