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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. > Hmmm. Interesting idea David, but I suggest that you compare the Amps and voltage to that of the ThinkPad's adapter first. And also check the polarity. You can do this with a voltmeter or multimeter. Paul