OM,
I just bought a set of AA Lithium ion batteries for my Canon digital. They sell them at WalMart and Target so they are easy to get. The Li cells weigh 0.52 oz each compared with 0.86 oz each for the alkaline cells and about 1.00 oz each for the NiMH cells. They are also supposed to last "seven times longer than alkaline batteries in digital cameras". I have some in my camera now and will let you know how they work out.
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May I walk in beauty.