The battery on my Lenovo X61 tablet PC finally died after two years of hard use. It was the 6-cell extended battery and gave me 3-3.5 hours of runtime when it was fresh even with Windows Vista constantly spinning away on the hard drive. I never thought of how important having a battery in a notebook computer was before mine died. Since we are close to returning this back to Lenovo, my IT department decided to purchase the smaller and cheaper 4-cell battery. What a difference. I am able to drain the battery in 1-1.5 hours. I am stunned by how quickly I am out of juice and now understand how much of a power hog Vista is with the constant indexing and the endless boot and shutdowns that drain the battery quite a bit even before I am using the system. My disappointment in the short battery life and with my IT department for "cheaping out" is tempered by the fact that for the roughly 10 days before I had a new battery, I was tethered to one place. Essentially I had a 12.1" screen desktop. One takes for granted the mobility a notebook computer offers you. This incident also makes me long for Windows 7. If a netbook can get great battery life using it, then the O/S should be great for my needs as well. At least I hope so.