My personal expierence, Workhorse with 8.1.
About 18 months into my wife's ownership the dang thing would not start, I used the emergency start and away we went,, Well, before I went to the dealer I crawled under it (The battery is behind the passanger side front tire, On mine I can just crawl under (no jacks needed) and sit there and work on it) with a load tester and guess what.. Battery passed, flying color (Green).
Re-connected the cable and it worked.
Turns out they used the wrong metal in the lug, and it gets a bit corrorded/dirty and routine cleaning is needed.
Home is where I park it!