HP/Compaq :: HP Dv2125nr Will Not Recognize Or Charge Battery

Apr 29, 2010

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.

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.

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.

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