I can't recall if it was the Palisade or another vehicle that was set up a similar way, but it is easy to remove the air duct to gain access to the battery. Just looking at the photo, looks like it has 2 of those push pins you simply pop up, lift the front end up and the back end will come out and then you have access to the battery.
How often do you planning on removing it? Usually in a new vehicle the original battery lasts 4-6 years.
Man, you are thinking ahead! By the time you'll need to replace the battery, there will be several videos on youtube, I'm sure. (May be there already, I haven't checked).
I haven't checked in the manual ... is there a separate battery for the auto stop/start feature? There is a separate battery on my Chrysler Pacifica for that feature, I imagine it is the same for all vehicles, but not sure.