i have read that many places. and i believe Garry said it also. it might have been 9.4 but it was somewhere between 9.2-.4
Edit: actualy, yes i do believe Garry said it to. i remember when the dicussion was going on about the esc cutting power at 8.7v and saying that's too low, you shouldn't run a lipo below 9.4v.
also go here, it backs up what i am saying. watch the vid. of the "v2.5 (Liglow with beeper)" the lipo alarm Starts beeps telling him to land at 9.4v.....watch it and see. and Thanh knows a lot about lipos
http://www.tjtrc.com/Videos/liglowBeep_short.wmv