A few thoughts.
1. Charger. It begs to have a full-sized USB connector at the back. Not that I was to lazy to put it there - I didn't think about it back then. Right now, battery terminals are exposed at the back as the wires, and I hook up my universal charget to charge it.
2. Motor is definitely weak. I am considering visiting an RC store to find a new one (will need a new battery, then). Nevertheless, a weak motor means that the cut-off wheel is going to last forever (until I break it; I've broken one already).