CK5
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dual battery kits: what would you use?

I have the Painless Kit, while its a great kit for being a smart setup it lacks the ability to use the auxillary battery for starting only in the case you left your keys on over night (ask my wife). Meaning it would be nice to have the feature to isolate the second fully charged battery to then start the truck. It will link the second battery to the dead starting battery but because one is dead and one is charged it still might not have enough juice to start, unless you wait long enough for the charge to transfer to the dead starting only battery. I believe the Hellroaring kit has this feature.
 

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