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I've been using a homebrew battery extender containing four rechargeable AA cells. No deleterious effects noted. So far, I've tried it with rechargeable alkalines and NiMH's, and the latter seem to last longer and deliver a bit more juice. The battpack was originally made for a Casio BE-300, which has considerably lower current draw.
If I needed a serious battery extender for my Axim, I'd look at making a new one, using C cells. I think their current output is close to the 2.4-amp draw of the Axim, and the voltage (a bit under 6V with four cells in series) should be well within the tolerable range. Of course, that starts to get a little heavy. At present, I'm happy with the original, which is light enough to be carried around daily. It's only used at work, when I need the Axim to stay on for awhile: rather than mess with power settings, it's easier just to plug in the battpack so that the Axim thinks it's on external power and stays on.
-Bill, Ottawa, ON
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