Here is what I use:
7 and 8 cell 600mAH AE nicads (cheap and good for 7-8 minutes with some throttle)
8 cell 1100mAH HE cells NiMH. A bit heaver but lots more duration.
Perry is nice and I ordered two more 8 cell packs from him Monday I got them yesterday!
http://www.aeromicro.com/Catalog/bat...4_products.htm
Mike