just upgraded to a LIPO DN brand 3s 1350mah 20c 11.1 volt[8D]
http://www.readyheli.com/DN_Power_3S...p20c13503s.htm
the helimax cp rocks now, 10 minute flight times, increased main roter head speed. and the battery weighs more, not sure how much I will have to get out the gram scale and weight it.
the battery is longer so it moves the C.G. of the heli towards the nose a little so it needs more foreward trim on the radio to hold a hover, I like the way it flies