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I have seen similar comments in other posts.
Trying to figure out how much charge is contained in a battery is a very difficult process.
What may have happened in the above case is that some app fired up the ax and kept it going until the battery was flat (maybe the app went rogue). By plugging the ax in the voltage on the battery would have risen sharply, giving the false indication that the battery had charge. (my opinion would be to fully charge the axim if this sort of thing happened before removing the power supply).
I'm guessing that the system used to determine % charge is different to that which detects fully charged (ie that drops to trickle charging and just powering the axim).
The fully charged state is quite often determined by looking at the voltage for a small dip after a peak and I believe that temperature also rises sharply at around this point as well.
% charge is sometimes determined by a combination of power in and power out - what is done by most laptops (which is why they can't give accurate readings either - some now have calibration software to correct this).
What techniques the axim uses - random number generator? who knows?
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