Justin,

I had the same problem a few weeks ago, thought the battery was going dead. It wasn't the battery, the motor was going bad.. Replaced motor, now everything back to normal.. If you motor is real hot after another run at it, you motor is probably shot.
Before doing that, make sure that your gear mesh isn't to tight, that can put an extra load on the motor also. Just spin the blade by hand, it should move easy and free of any binding. You shouldn't hear any grinding at all.

Dave / Choppersrule