Okay, so it's 4.4Ahr. The only other thread on this board I've come across in regards to portable batteries for our empegs is this one from a long while ago, in which there's mention of the bikempeg, which supposedly had a 5Ahr battery that gave Doug 8 hours of playback. Well, I suppose that means this one falls a little short of that, but it's still pretty good. I don't know much about the one Doug used, but this one is supposed to be very light and small, and the adjustable voltages is nice. Again, I don't know how much of this stuff Doug's had. I plan on ordering this battery in about the next week. I'll do a little empeg test then.