Thread: What battery should I connect compressor to?

Each to their own, 2nd battery for me is for cold beer, led lights, and deep cycle applications.
Main battery is cranking, winching, spots, compressor, high draw applications with alternator supplying the juice.
Heavy amp & massive power draw (I.e. Compressor/winches) will kill a deep cycle in no time.

IMHO....

you connect it to any battery that is a cranking battery (if your going to be pulling 50a) and it doesnt matter which if you are only going to be running it with the engine on with the alternator pumping.

If you have 2 crank or dual purpose batteries go either but if you have a cranking battery as the primary and a deep cycle as a secondary then hook up to your primary.