I found that LiPos work the best in the Aerobird. With the NiMh, you start off with lots of power then it drops off pretty fast. With these, you get great power more evenly across the board.
I listed a charger and a battery below. Both of them is just a little more than one standard replacement battery. You will be very pleasedwith this setup.
I used to run 8 and 9 cell NiMh in my Aerobird 3 but found the battery below lasted much longer in the air and gave more power than the other batteries. LiPos have lower internal resistance
and can deliver more power to the motor. You may want to try some mashed down fishing weights (or LHS lead weights) to balance out the plane since the lipos are much lighter. JUst stick a few in the nose
lowdrag
Charger
http://www.hobbycity.com/hobbycity/s...idProduct=7898
Battery
http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack