Guys, thanks for the input. All sounds good.
Rwd, the input I got from Chris at Teres was that the battery had likely died, as it wasn't running smoothly and was making some rough noises. When I plugged directly into the wall, the motor worked great though. So best theory is that the battery is simply dead, which is no biggie - easy to get up and running again. I had the battery for somewhere between 1.5years and 2 years. Good luck with next steps on the Teres/Galibier purchase.