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I wrote: >>You can get SLA portable power packs for camcorders which have an automotive cigar lighter socket Paul wrote: >And make sure you can get it to the same voltage and ampherage as the ThinkPad AC adapter does. No, no, my idea was a setup like the following: TP<-->Car adapter (from IBM or Xtend or Lind or whoever)<-->battery pack. The adapter already does the conversion between the TP DC input and the car battery 12vdc output. If I already had one of these converters, I might spend the money for the battery pack just to see how well it works; however, I really don't want to spend $50-$100 for the adapter (which I will never use otherwise) on top of the battery cost. (BTW, if anyone wants more info, I get catalogues from several photo companies who sell such packs, I can quote some representative prices and specs.) - David