Dead battery at 2 years, 8 months. Not too difficult to swap out if you know what you're getting into, but WAYYY more difficult that just replacing a battery should be.
Watch the YouTube video where the guy flips the battery on its side when removing and installing. This way you don't have to move the coolant reservoir. Great tip.
https://youtu.be/35ih6Ncd_Eg
The worst part was the $250 battery, which was the cheapest one AutoZone had. 5 year, 100% replacement warranty though.
ALSO, the guys (and gal) at my local AutoZone were great as usual. They offered to swap it out for me if I brought it back during daylight hours. Said it would take 30 - 45 minutes, as they had replaced several already. Doesn't hurt to ask!