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Bryan Daum's question about 701 batteries reminded me of something else that's been on my mind lately. A couple of companies (e.g., www.powerit.com) sell outboard batteries for laptops (i.e., batteries which can run your laptop for many hours). However, they are kind of pricey. In the VCR/camcorder world, there are several companies that make 12 volt power packs for camcorders at a decent price. For example, Bescor makes a pack that weights under 3 pounds, comes in a shoulder pack, has an auto cigar lighter output, and produces 3 amp hours at 12 volts for less that $40, and a 5.5 pounder with 7.2 amp hours for about $45. (Compare to the TP560 battery, which is 2.2 amp hours.) It seems to me it *should* be possible to hook one of these to the TP using the auto adapter, and get lots of extra time (perhaps some lost to inefficiency of the connection). So, my question is: Has anyone tried this? If not, can anyone who knows more about such things than I comment on the plan? BTW, I would just go ahead and try if I already had the auto adaptor for my TP, since the battery is so cheap, but I hate to buy the adaptor for the experiment. - David