Just to make ya think about AC Delco batteries... Mine went South on me in '05. That was the OEM battery in my '02 Yukon. The positive terminal fell off (still screwed into the positive cable.

Was pissed one morning at 6am cuz I was trying to get to work. No start. Hitched a ride to work, then back home. Got home that day, it started fine, so I ran it to Autozone for a battery check. Guy goes to put machine on it, and grabs the positive cable, and BAM, it falls out. We look at each other like WTF?!?! That was a DELCO. Guess I got the lemon of the bunch.

My dad's got a Yukon XL, and his DELCO just died one day with no warning. Got stuck at a golf course, and to get a ride to get a new battery. DELCO wouldn't let a jump get the truck started.

Optima would be my next choice.