A youtube post instructing about disassembling the machine from one Korean user is easy to find, but is it really needed to go that far to change the battery? Unfortunately, yes, as one needs to reach the motherboard.
It is easier than it looks, just make sure you undid all the screws.
Beware to unscrew the middle screw keeping the keyboard, from the opposite side of the machine!, youtube post did not dwell on this enough and I found myself needing some time to understand where is the problem.
To reach the battery, you do not need to disconnect the keyboard cable, it is safer to just lift the upper part of the machine, not to disconnect the cable.
The battery is here:
It is a standard flat CR 2032 battery, covered with a protective foil, just remove it (and put back after inserting the new one).
I really appreciate this little machine. After more than 10 years of use, it still runs nice (under Linux, sure!), especially after adding 2GB RAM. Its hardware is really robust! Good job, Uniwill!
