I was there for Gary's flameouts, and for two others I knew about. All were fixed with setting the ECU to 8 cell NiCd.

When you charge ECU batteries, set the charger to no more than 3.6v cutoff per cell. that will get them 95% full but not over charged.

I have charged A123's to over 5 volts per cell in testing. they eventually bled back to 6.8(3.4/cell on a two cell) volts, but it took a bit. Of course they were ruined, but it was controlled testing. I could see issues if you charge them to 3.75 v/cell or something like that where they have residual, but they truly self bleed in a few mins. One thing I would not do is charge them while plugged into any ecu.

Contrarily, I charge my receiver packs to 7.5 volts all the time. they bleed off quickly as soon as you hit the power in 15 sec or so.

just a little FYI.