Have you tried the batteries from Hobby King
They are 160map at 30 c at $1.47 ea and $6.00 dollars to ship with longer cycle times of up to 600

I seemed to have discovered that these 3 pole motors require more power than the E-flight batteries

My bird has become a smooth dependable flyer

This is a truly engeneering success from E-flite
Inexpensive, easy to fix, parts are cheap and flies like models 2 twice the price
excellent learning tool and a lot of fun
I have paired my with a DX8, and the control of this bird exciting

Bill Truax