I bought a new 9cell battery from eBay (link) for my old and trustworthy Fujitsu Siemens Amilo Li2727 laptop, since the 5 year old original I have only lasts for a half an hour these days.
The problem that I have is that when I use the new battery the laptop opens but gets stuck in the initial BIOS boot screen (where the CPU, memory check and drives are seen) with no error whatsoever. It just gets stuck there and doesn't move on to loading windows.
When I use the cable or my old battery to boot, everything is fine. When I use the new battery after booting into windows, or even after just passing the first BIOS screen, the new battery works fine and lasts a good 3 1/2 hours.
The company has suggested that I return the battery if I wanna, but somehow it feels like it is not the battery's fault and that I will have the same issue with the replacement. I am using the latest BIOS version available for the laptop.
Any ideas on how to fix this?