Why don't you like the 2700mah? Is it because of where it mounts? If so here is one that mounts right where stock battery box is and they don't weigh all that much more then a standard hump pack (1.5-2.0 oz more). I have had this battery for over a year and have never ended the day because of a low battery and I run a Airtronics 94358Z ERG-VB Hi-Torque 200 oz for steering a JR standard servo for the throttle and a Cirus high torque mg servo for the break. It last longer then I do.

http://www.onlybatterypacks.com/show...temID=10189.16