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The Axim requires quite a bit of power to charge the battery. The wall plug is rated at 2410 mA, for example. Even the car chargers are rated at 850 mA or more.
USB ports are only rated to 100 ma, possibly 500 mA if the manufacturer decides to push the upper limit. So, the USB charge cables WILL discharge the battery in certain circumstances. The way the battery charges depends on the remaining power. As the remaining power declines, the charging demand increases. At about 70% the demand for power exceeds the standard USB port's ability to provide. Apparently the charging circuit continues to make demands, so the battery steps in to provide the demand. Of course, now you have the battery charging the battery so the draw is much higher and the battery discharges faster and faster.
The moral of the story is to use the USB cable only when the battery is 70% or more. Below that, on a standard USB port, you are going to be in a losing battle.
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