The car: 2010 Prius III with 59,000 miles. The situation: Stuck in traffic jam for 10-15 minutes, during this time the battery went down to 2 bars like normal and the engine started. I pulled in to the car wash as planned and the engine started again while I was in the wash. In the wash I was in neutral. 3/4 of the way through the wash the yellow triangle lit and the display read: "Traction battery low: Please place car in P" Of course I could not do that inside a car wash. When I got out I put it in D and the alarm went away, I briskly accelerated and used the brakes to regen up to 3 bars. After that the battery functioned as normal and was up to about 6 bars by the time I was done with my errands. Does the MG not actually charge the battery in Neutral? I am hoping that this was just a "perfect storm" situation. Should I do anything other than what was done? We are actually driving to Florida tomorrow and it has me a bit on edge.