Forgot to mention that I flew both the stock pack and the Turnigy packs I bought (http://www.hobbyking.com/hobbyking/s...idProduct=8934
) and I can say the Turnigys have noticabely more power.
My ST-1 is 90-80-70-80-90. After the 6 minute timer I put around 1100mA back into the Turnigys. I would wager you could get 8 minute of good flight out of them. For $11 they're a steal!