Hi everyone, and Merry Christmas!

I have a Fujitsu Stylistic 1000 Pen PC.
The device itself works flawlessly, and it even came with a working PCMCIA hard drive, which I think is pretty neat.
However, it lacks both the main battery and the CMOS battery.
I don't care about the main battery at all. The lack of a CMOS battery is somewhat of a bigger issue.
The thing is, I have no idea what kind of battery it originally came with.
Hence, my question is, what type of battery will I need, and how high does the voltage need to be?
Thanks in advance for your help.

I'm looking forward to your answers.