HP dv2125nr will not recognize or charge battery

Hello,

My first post here and I have an issue to discuss and hopefully resolve!

I recently was given an HP dv2125nr laptop that needed a new motherboard. I purchased a new one and replaced it and the laptop was up and running. I was happy and figured that I had just salvaged a decent laptop for around $100.

When I first turned it on I noticed it wouldn't run off battery power but thought, no big deal it just needs charged. That turned out to not be the case. I went about reinstalling the operating system using the recovery partition and didn't give much thought to running it on battery til I noticed that the power icon said "On AC Power, Charging" It didn't give me a percentage however, and when I double clicked to inpect further I noticed that the battery icon under battery #1 had an X through it, and it also said "Total Battery Power remaining: Unknown".

At this point I updated the BIOS because I had seen a few forum topics that suggested this, I also made sure I had the most up to date drivers off HP's site for all hardware. Another step I took was to uninstall the "Microsoft ACPI-Compliant Control Method Battery" then scan for hardware changes and let Windows reinstall it. None of this worked.

I then assumed I had a bad battery on my hands, I ordered another one (not an HP, a cheaper one) and when it came I plugged it in overnight to charge and after about 12 hours turned the laptop back on to see if I had a fully charged battery, I did not!!

It was acting in exactly the same way the original battery had acted. The only difference that I could notice was, that on one of my many reboots the icon under battery #1 in the Power Meter window only had a single red slash through it, instead of a red X.

Things I have tried:

1. Updated BIOS
2. Updated all drivers
3. Fresh install of Windows XP (again after the original recovery install)
4. Unistalling the "ACPI-Compliant Control Method Battery" in Device Manager.
5. Ran HP Battery Check Utility, has a divide by zero exception upon startup, then says no battery is present.
6. Booting directly to BIOS and allowing it a chance to charge overnight.
7. Swapping both batteries (no difference).
8. Taking back apart casing to make sure there were no loose wires.

I hope someone here can shed some light on my issue, and point me in a new direction. As of now I'm all out of ideas.

My only thought next would be that either both batteries are bad (seems unlikely) or that there is a problem with the new motherboard. The motherboard being bad would surprise me, as it is able to run just fine without using battery power.

Thanks in advance and I have much appreciation to anyone who will volunteer to help me out with this issue!!