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Posted

94r is the largest no mod batt that will fit. That said you really should not mix batts of type and im sure you've read there's more to it then just adding another battery due to the charging system. The old batt will drag the new one down.

Posted

Stock main battery is group 94R flooded lead acid on a 2015 1500.  Aux battery would be a group 48 flooded lead acid.  

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