|Well thats a good question.|
From what I understand from the service manual for A100 series you short the cap without battery and without AC but with the RTC battery.
In the manual it mentions removing AC and battery but doesn't mention the RTC battery I assume you don't remove the CMOS battery.
As for the capacitor you should look for caps that end with 88 e.g. C1088 or C2088 or even C0088. From the manual I would bet that the capacitor to short is either C0088 or C1088, but thats just a guess.
Of course theres always the risk of damaging the board althou its very unlikely because you are working without direct power such as AC transformer and Battery.
Althou i've seen damaged boards from direct malfunction from the CMOS battery.
Basicaly when you short the pins from a capacitor your doing a bypass to the capacitor there shouldn't be any damaged from doing that.
If it was my notebook and I couldn't find the C88 capacitor I would short every capacitor with the 88 number on it one by one, of course this is a last resource.
If you could post really big and upclose photos from the entire board I could try to take a look, althou it will be hard from a photo.
Once upon a time the floppy disk was king.