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Have you been tinkering with the battery. I had nearly the exact same experience when my first spare battery finally arrived a few weeks back. My battery arrived a few days after the first battery patch appeared on the HP website.
Without the patch, when you remove the battery and reinsert it (or insert a freshly charged one), the 5450/55 does not recognize the battery and causes a hard reset (loss of power).
In my case I removed the original battery and inserted my fresly charged spare. When I powered my iPAQ on, if turned on for a brief second and the screen went dead. I soft reset the device and it caused a hard reset. Fortunately, before I started this I did a fresh backup and was able to reinstall everything in a few minutes. Tried it again and the same thing happened. I downloaded the battery patch and the problem went away.
The patch is available a as a stand-alone or is included in the most recent ROM update.
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