Minimum Battery Specs for an 80?

[Salue]

I was reading this post about the dual battery in a single tray: http://forum.ih8mud.com/80-series-te...y-install.html
and like the idea of having the 2nd battery just for backup jump starting. I saw that the CCA for the 2nd battery in the link is only 220 or 280, which seems pretty low to turn our big rigs over. If I got a non Odyssey battery that had the same ratings, should I be ok? Could I go to an even smaller 2nd battery?

Salue

[Lka1988]

I have a similar setup, but my batteries are more closely matched....kinda.

Main battery puts out 400 CCA, supplies all regular vehicle loads (starter/headlights/etc)
Aux battery puts out 750 CCA and is a deep cycle, supplies all "fun" loads (aux lights, sub/speaker amps)

I, personally, wouldn't go less than 400 CCA on ANY battery.