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>My personal favorite would be Sealed Lead Acid, but it's obviously too heavy for notebook You can get SLA portable power packs for camcorders which have an automotive cigar lighter socket connectors for a very reasonable price, i.e. $50-60 for a pack that should run a Thinkpad for 6 or 7 hours. If I had an automotive adapter for my TP I'd probably buy one of these just to see how well it works in practice. >I also like NiMH, too. So, what does Lithium Polymer have that Li-Ion doesn't? Thinner, lighter, can be twisted into special shapes. David A. Ross ross@math.hawaii.edu www.math.hawaii.edu/~ross