Well my (older than 7/19/2012 build date) battery went bad yesterday. I followed the air box method and it went very smoothly. Put in a factory sized Interstate from my trusted german car mechanic.
Couple of things (I figured out the 1st 2 after I had already undid them!
You don't need to undo the wiring loom from the front facing cover
You don't need to undo the 2 wires/nuts at the bottom of the front facing cover
All the above will just fold down and out of the way with the cover
There are no lower screws on the air box on the 2.0, just the 2 that fix the MAF box to it
The lower box just pushes in/pops out at 2 spots
I did be sure to inspect the negative battery sensor and wiring at the negative terminal, absolutely spotless and none of the battery build up that some reported.
Took me about an hour - hour 1/2 start to finish.
Once I had it all together, I was surprised to see that my phone, radio presets, gps favorites and all that had not been erased.
I was also lucky that the old battery wasn't completely dead, just not enough juice to start or open the power liftgate. There was enough juice for the IA key to unlock the doors, and I was able to pull my tools from the hatch by folding the back seats down.
Found out a bit more about resetting the one touch windows as well. If you run the reset without the climate or radio on, you can hear the modules go to reset mode. Doing it this way you just open the window a bit then pull up the switch all the way to auto up and hold after the window is closed, you'll hear a light click similar to the door locks, then do the same, push and hold until the window is fully open (you'll hear a bit fainter click after the window is open), then pull and hold one more time until the window is closed and you hear the click, repeat on all 4 windows, done!
I'm leaving it overnight (12 hours) and will then check the BLM with my scanner to see if I need to set it through ForScan.