KenjiFox 2 cell lithium 18650 batteries in series 7.4v. 20 watts. I didn't open it up, so it's possible that it's in parallel but it wouldn't make any difference a that point. The motor is 20 watts either way. The motor shaft is threaded with changeable blade. The motor runs somewhat gently but not lethargically compared to some of the more powerful cups, but hopefully that means it will last longer with daily use too. It's not uselessly weak like the "blendjet" from wally world. I just got mine so we shall see about the useful life. I've owned a LOT of these blender cups, so far this one looks promising. The blades are very well balanced and there is not much brush noise. That combined with the glass cup makes this one of the quietest ones I've ever used.