DON'T BUY INTERSTATE BATTERIES.. THEY SUCK!!!
I have replaced more Interstate batteries than i can count. The one that came in the minivan we had died and left us in the cold, and the one in the PT Cruiser we have is starting to make me think its going to get replaced before winter arrives. Both vehicles came with an Interstate when i bought them so i didn't have a choice at the time.
Back when i lived on the farm we went through Interstate batteries like they were Rayovac cells.. LOL
I have an Optima Yellowtop deep cycle as my backup battery in the radio room, aka the shack, and that battery is awesome, it takes long discharge and recharge cycles no problem. I've killed a few other deep cycle batteries in the same application so this Optima has me impressed.
The Jeep, hmm, i don't remember what is in there. It's new and was put in by the dealer when i bought the KJ. I will have to look and see what it is, overall though it doesn't worry me until i have troubles, when i do its time for an Optima RedTop.
As for the comment about Wal-Mart batteries, i went through three of them in the same amount of years in one of our past vehicles, they suck. But if your in a pinch and can't afford anything else they will get you by for a while.