My kids are using an old Acer Aspire 8920g. It’s an old model (I think it was built in 2008), but works fine with Windows 7.
Only one thing as annoying: The CMOS-battery was not working anymore and so the laptop always lost the time, when it was disconnected from the power-line. Not only the time was wrong, but also all certificates of my browsers were invalid because of the system-time somewhere in 2006.
So I decided to replace the battery. I opened the laptop and could not find anything that looks like a CMOS-battery. I googled that and found a video of someone, replaced that battery before me. It’s a horrible process and it took me around 2 hours to completely disassemble the laptop, but at least I found the battery and removed it. It’s a CR2032 with solder-flags. I thought about to buy such a battery online. Best price was around €4, but I had to wait a week.
I have a lot of CR2032 and also battery-holder in SMD and through-hole to solder to my PCB and so I decided to replace it with such an solution and to move the battery to the empty HDD-slot. So I can easily replace it again, if necessary (I think the laptop will not be used as long, but who knows).
After all, I realized, I could also cut the cable only and let the old battery as it is and only used the connector. So I could avoid to disassemble the laptop. If someone need to replace the battery too, try to only cut the connector, solder it to a longer cable and put the battery to another place within the laptop. Have a look to the following image: