Cannot Diagnose Battery Problem - Pavillion DM3 - repost after no response

Hello,
I have some kind of problem between my Pavillion DM3 and its battery, but cannot figure out where it lies. The notebook will not operate without AC power. When I plug it into AC, it boots and is usable. The charging light on the right front of the notebook flashes regularly. When I mouse over the power icon on the toolbar, it indicates that the battery is charging but that it is at 0% of capacity. It remains in this state as long as AC is available and the computer is turned on. The light continues to flash when the notebook is powered off. When I start up the HP diagnostic software on the machine and try to check the battery health, it runs for a while and then tells me that the battery cannot be detected. It then advises me to remove and reseat the battery. Needless to say, nothing changes once I do this. I have tried repeatedly. For what it's worth (are you listening HP?) , the error message does not suggest powering down the machine prior to removing and reseating the battery. I was careful to do so but wonder what the consequences would be if someone removed the battery without first turning off the machine.
I would consider buying a new battery, but I have no way to assure myself that the problem is in the battery and not in the interfacing circuitry on the PC. With no idea what it will cost to resolve this problem, I am at a loss as to whether repair is an option, or whether I'm better off putting the cost of repair towards a replacement notebook.Can anyone help me with this.
Thank you.

After a long wait, someone replied to my earlier post suggesting that my problem was with the battery itself. I went to eBay and found an inexpensive (~$35) battery which now appears to be working fine. By the time I removed the old battery, it was literally swollen. I thoiught it might be ready to break open. All seems well, but I'm glad I didn't pay HP the $49 to "diagnose" the problem and/or whatever their full freight would have been for a replacement battery.
If anyone from HP is reading this, I have two problems with HP. First is the poor quality of their products, and second is their poor support for out-of-warranty products. I went months with no response to two posts on t he user forums. Instead of trying to scare people into buying genuine HP ink, HP should improve the quality of its product and offer better support.

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Cannot Diagnose Battery Problem - Pavillion DM3 - repost after no response

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