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I've seen some external batterys for Macintosh PowerBooks and PC notebooks such as the Toshiba T4800. The Toshiba one was a thin, hard plastic enclosure approximately 8"x10" by .5" thick. You could set the Toshiba notebook PC,on top of the battery, then connect the battery power output to the computer power input. If you were on an airplane or somesuch, you could just leave the battery in your briefcase and run the power cord from the battery to the notebook on your tray-table or lap. Do similar batterys exist for the IBM ThinkPad? Does anybody have any experience with BTI's external battery for Toshiba notebooks or similar ones? These batterys were originally available exclusively in the Mac world for PowerBooks and Duo's. There were three suppliers: Technoogin, VST and BTI. Now I see BTI is offering several models for PC/Windows machines. These are very THIN, lead acid batterys that supposedly will add 3-8 hours to the life of the notebook battery. Seems to me that it would be great for travel .. and the thinness of the battery makes it ideal for carrying in your briefcase. Anybody have any knowledge of these?