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you need to show us a pic of the amp/hour rating (A/h). A/h will tell you how many amps it can draw in one hour before going flat. ie if its 90 A/h it will go flat in an hour if its drawing 90 amps. 670 cold crank amps (CCA) is pretty big you can go bigger. I have a 750CCA in mine
Cheers
Benny
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