This is interesting. I had just switched over my F-15 to A123's a few days before the Mid Atlantic Jet Rally this past weekend. I cycled the batteries a few times but didn't get to run the engine. I made the first flight late in the day without performing any calibration and it went fine. When trying to squeeze in a second flight before I had to leave, I had the engine running and had to wait for two other planes to take off so it was idling for maybe three or four minutes. Just when it was my turn to taxi out, I brought the idle up and the engine shutdown just as the RPM's started to come up from idle. There was no puff of smoke. It just shutdown. I tried to check the data terminal to see what happened but I probably didn't get into the right menu to see and people were waiting on me to pack up so I could give them a ride home. I'm wondering if the lower voltage of the 123's had anything to do with this. I haven't run the engine yet to see.

Marty