LiIon batteries are rather unpopular because they are difficult to replace on your own-the readers of the WristPDA yahoo group can chant a song about this problem.
Dallas Maxim apperently predicted the chant, and recently released an application note covering a circuit that converts a single NiMH cell into a “Li-Ion battery”-at least while the discharge process is running:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/3744
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