|Wow. Weird. I've worked on a lot of Dells, but haven't seen this issue personally. I'm seeing varying information online that states that BIOS updates are fixing these issues, and per the BIOS "Issues Fixed" Notes on Dell's site, that rev 2.6.3 A16; it states under fixes: 1. Fixed erroneous Bad Battery message during post.|
I also see that people that have replaced their batteries have corrected this issue. Your motherboard seems to be ok, as the OSes (Linux/Vista/7) seem to run ok. I'm wondering if it's your battery?
Q: When battery is removed, and laptop is plugged into AC power, and you turn on laptop, do you still get that Battery not recognized message?
You might want to run the FULL Dell Diagnostics from the Dell Drivers & Utilities CD, or D/L the Diagnostics from Dell's and make a bootable disk to run it. There are battery tests and battery charger tests in those diagnostics.
Just another stupid saying...