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> >Just wondering if the 701 has a lithium ion battery option. I'm aware of the > >NIMH but in the May 1996 issue of BYTE magazine, the article "Perfect-Fit > >Portables" states:" For an additional $150, you can buy a lithium ion battery > >(for the Butterfly) , which should boost the charge by about 20 percent..." > > > >Any comments? > > If this is true, I'd like to buy one. > > But offhand, I'm willing to bet that article got something wrong. > Lithium requires a different charging cycle which is not likely built-in to > the 701's charging method. NiMH and NiCD use virtually the same charging > cycle, but Lithium's is different enough that you can't just stick it in > and charge it the same way you would one of these others. (don't ask me > the electical details, but my father was involved in designing batteries > for a while and told me this). > > So I'm guessing Byte go something wrong--or that you have to buy a > separate external charger to use this battery. Well, if i'm not wrong, IBM uses some technology called Smart batteries. such batteries contain the charging unit inside the battery. that would explain the 4 terminals on the battery, 2 for the current supplied by the battery, and 2 for the power supply to the internal charger. anyone knows more about this? sam.