Hi Evan
No I have 3 x 8.4V 1200Mah Nims which are slow charged (0.3A) the day before, then on the day I fast charge at 1.2A, the trick is not to totally flatten the batteries. So whats happens is I load the first battery and fly for 15 -20 min's (lots of gliding/thermaling) I still have 2 batteries that are fully charged from the day before so the flight battery goes into a small esky/cooler with an ice brick in it, I might have a quick coffee or drink etc then in goes the second battery.... go flying etc then the first battery is removed from the cooler and put on quick charge, second battery goes into esky/cooler, third battery is in plane another break/breather then off for another flight now the first battery will take 15 - 20 min to peak and as soon as it does my flying mates will remove it and place the one in the cooler on charge for me, l land the plane third battery goes into cooler and it all starts again.

The trick is simple instead of using 2 batteries and totally flating them which mean it will take approx 45 - 60min to recharge each battery - I use 3 batteries and try to only use 50-75% of there power so the recharge time is shorter. My mate uses 4 batteries and 2 chargers and he can fly non stop all day but if you are using the motor full time you will get approx 13-15min flights and totally flat batteries.

One thing as well I am only running the standard 400 motor in the ES as well - it has plenty of power.

Cheers lawrence