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I too lost approximately 10% of my charge overnight, while in hibernate mode. IBM tech support told me that the culprit was the smart power monitor on the battery, and that this could be avoided by removing the battery when fully charged and turning the power switch off. I tried this during spring break, when the TP remained plugged in to the AC adapter. When I reinstalled the battery it showed a 0 charge on the gauge. My estimate is that it had lost 50% of its charge while stored for a week with the power switch off. P.S. I for one would not care as much about estimating battery life if it were feasible to carry two or more spares. Following a suggestion from someone out there, I called Duracell about the possible availability of generic NiMh spares for the Thinkpad. Duracell is not very far along in the project, notwithstanding announcements made in the press. They are still at the stage of trying to persuade manufacturers to adopt standard sizes in their next models -- repeating a process that they went through some years ago with manufacturers of cameras. Duracell does not want to be responsible for computer batteries that are not recommended by the computer manufacturer -- or so it says. It hopes to have some NiMh batteries out later this year, but I am not optimistic that there will be a generic standard battery for the present generation of Thinkpads.