i found one of the best batterys for the axe,,,i use the aplus 1350c 20c 35b 11.1v this baby had tons of power with longer flight times than the one they say to get....plus it costs less....the one they say,,it runs for 75 here,,,i got mine for only 60....more power and cheaper,,,its the way to go and it has a balancing lead.. the canopy fits a bit tight but the extra 3 seconds is worth it..i have a close up pic. of mine in my profile.....hope this helps..............