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<blockquote data-quote="brian84corvette" data-source="post: 8333975" data-attributes="member: 586635">this question has a subjective answer.&nbsp;&nbsp; yes you could run it with your stock battery - but by the most apropriate and correct way to battery multiple - is they all need to be the same kind / and level of use.flooded / wet cell normal car batterys tend to rest at 12.7 volts.&nbsp;&nbsp; agm / absorbed glass matt batterys tend to rest at 13.1 volts ( brand new and not abused yet ) so just hooking two diffrent kinds together will result in a agm battery that is constantly trying to over charge a wet cell normal battery -&nbsp; and a normal wet cell battery keeping charge level real low on the agm battery = they will wear eachother out quickly.that *****the other thing you could do would to be install a relay between each battery - that only turns on with key on in the ignition.that way with car off - the batterys are seperated from eachother....&nbsp;&nbsp; this is betterbutthe best is to have all batterys of the same age and same use cycle to them.one brand new battery hooked to the same kind of battery thats older and been used / abused for a while already is not an ideal setup either.</blockquote>

[QUOTE="brian84corvette, post: 8333975, member: 586635"] this question has a subjective answer. yes you could run it with your stock battery - but by the most apropriate and correct way to battery multiple - is they all need to be the same kind / and level of use. flooded / wet cell normal car batterys tend to rest at 12.7 volts. agm / absorbed glass matt batterys tend to rest at 13.1 volts ( brand new and not abused yet ) so just hooking two diffrent kinds together will result in a agm battery that is constantly trying to over charge a wet cell normal battery - and a normal wet cell battery keeping charge level real low on the agm battery = they will wear eachother out quickly. that ***** the other thing you could do would to be install a relay between each battery - that only turns on with key on in the ignition. that way with car off - the batterys are seperated from eachother.... this is better but the best is to have all batterys of the same age and same use cycle to them. one brand new battery hooked to the same kind of battery thats older and been used / abused for a while already is not an ideal setup either. [/QUOTE]

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