OOps, spoke too soon. The Kokams aren't out yet.

Notice there are a couple different shape batteries in the 1250 mah size. I think this would work.

http://www2.towerhobbies.com/cgi-bin...?&I=LXNYJ4&P=0

This battery is short enough to fit in the Axe and under the plastic canopy. It also has a balance port which you will want to utilize. Keep these lipo's balanced with a balancer so they don't overheat during charge and catch fire. Its also 15C . This means it puts out 15 times the rated capacity (15 x 1250 = 18.75 amps output) more than enough to run your Axe.

The 800 mah 10 C would only put out 8 amps which is close to what this heli draws. Could lead to hot batteries and short life of batteries. Will also result in short flight times with this low capacity (800mah).

But, I went with the ThunderPower 1320's.