I know that they never fail at a convenient time/place, mine failed on my way home from work. The Air Force Base that I work on had a security issue and stopped all outgoing traffic (15 miles of NOTHING, either direction, other than the guard shack), so to save fuel, I turned my engine off and within 2 minutes, I received the "Low Battery....Start Engine" warning......................she would NOT start. Got a quick jump from the Ram next to me, and went home. Next day, I ran a few errands, no issues until I completed the last errand......she wouldn't start again. Called AAA out, they jump started my truck and I drove to stealership (other side of the highway, less than a mile away), where they replaced my (2yo) battery for FREE.