I use Electrifly balanced Li-Pos (GPMP0709) (charged on a Triton Jr. with an Equinox Li-Po cell balancer) in my Axe and the motor gets warm, but not warm enough to be alarming. I get about 10-11 minutes on these as well. I aslo use the Electrifly non-balanced (I've have had them a lot longer, since I bought the chopper last September) GPMP0815 batteries as well. The balanced batts are only a month or two old.