Did you measure the new and old battery?
We talk about an 6 years old Packard Bell - Desktop Computer
The CMOS battery was empty, there was the message at the post-Bios-Screen, so I replaced it with a new one (CR-2032 3V).
The battery is exactly the same as the old one except the brand.
Of course the PC wasn´t plugged in anymore and I grounded myself before making the replacement. Besides I made sure to get the polarity right.
After the replacement the PC stops booting when reaching the "Windows is starting-Screen". It might be important to notice, that the pulsating Win-Logo, that shows up normally wasn´t visible. I tried to boot from CD, USB and Safemode, I even tried Grub, but the PC wont get past that point. Booting from CD will result in a Blue Screen and grub goes into the grub rescue mode(just DOS-Commandline) I tried with resetted BIOS-Setings and with optimized ones, but I had no success.
Strangely enough the PC will work normally, when I remove the battery or put in the old (empty) one.
I "solved" the problem by making sure, that the computer is always plugged in, so it doesn't need the CMOS-Battery at all, but I am still curious.
Could the new battery be the culprit and is it worth trying another one? I work with Computers a long time now, but I never ever experienced something like this. (it is a simple CMOS-battery change after all)
I am happy to hear about your thoughts regarding this problem.