10-14-2012, 01:36 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
You could also use two 12's in parallel. The optimas need a minimum voltage to take a charge, especially on the old school chargers. You can hook another twelve volt battery up to them in parallel to initiate the charging then disconnect it.
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