On battery right now to run down and re-calibrate, and just noticed going from using the trackpad to a mouse make's a noticeable difference in battery life. I've been flipping back and forth to check, and using the mouse seems to make the battery life jump 40-60+ minutes depending on what I'm doing, multiple tabs/browsers running etc. I.E. if I'm at 4:30 like right now, and using the touchpad like I am right now, it drops to about 3:35 left for battery life... plug the usb for the louse back in, and it goes back to around the 4:30 range. Seen other people mention that but didn't pay much attention to it, cool little bit of info if your trying to maximize battery life.