Yeah, good advice. Go to www.radicalrc.com and go through the battery packs (they have pictures with dimensions) and see what will work. Just remember to total up the number of discrete cells you would use, probably 8 for a 9.6 volts (nominal) and get a pack that matches what you would use as single cells. This, of course, is if the transmitter is set up for a pack.

If it is not set up for a pack, then switching over to NiMh packs will be just fine. I assume they are AA cells.. Get the highest capacity you can find, though.

CGr.