in 1.5 years. It just happened yesterday. The car was loaded (5 people) and I was driving on a very congested street. There was apparently enough regenerative braking to do it. It lasted only a short minute or two. Most of the time the indicator sits on two bars from full. 90% of time its between 2 above "empty" or 2 below "full". I don't do much EV driving to avoid wear and tear on the battery.
No biggie. My commute back and forth to work involves a return trip down the Wachung Mountains. (Actually, hills - anybody looking at these things who've been out in the left U.S. or, for that matter, New Hampshire would laugh hysterically at the thought that these things were mountains.) It's a 3/4 mile downhill with congestion and a couple of stop lights at the bottom; I max out two days out of five going that way. KBeck.