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Old 10-05-2012, 07:22 PM   #2
Reddog*
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Joined: Nov 2007
Location: Mi in between the Right and Left
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Hook the batteries in parallel using jumper wires and use one battery tender.

That said you will need to check that all the batteries when fully charged have the same voltage reading. Other wise the weakest one will draw the rest down to its level, shorting the life on the other three.

In reality using four battery tenders will be easier.
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