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writes:

Alternately look at cameras using propriatary Li-Ion batteries.

The problem with those are proprietary packs of any cell chemistry sell
at extorsionist prices. For the price of one spare Li-ion pack, I can
buy several sets of NiMH cells and, at todays performance levels, the
NiMH are very little behind similar volume Li-ion packs in performance.

LiIon packs have some advantages over NiMH: lower weight (not volume)
per unit energy, low self-discharge rate, and good low-temperature
performance.

On the other hand, NiMH is much cheaper and should have a longer life.

LiIon also have the pseudo-advantage that the manufacturer *has* to
supply a decent charger for them. You can get equally good NiMH
chargers, but a lot of the NiMH chargers sold are junk. You have to do
a bit of research to get a good one.

Dave