Rechargeable "Coin" Battrery in a MB???

[jopower]

I've just discovered that there are rechargeable coin batteries, both Ni-MH and Lithium:

http://www.chungpak.com/pdf/catalogu..._Catalogue.pdf

http://www.chungpak.com/pdf/catalogu...utton_Cell.pdf

I'm sure there's more than just Chungpak (aka: Evergreen in USA) as a supplier, but that's not the question.

Will a rechargeable coin work in a modern MB like the old NiCad stacks did in the 486 days? I suppose I could find an old P3 machine, pull the coin and fire it up. A pair of DVM probes showing anything around 3 volts on the coin contacts would be definitive. But does anyone already know about this and is it a safe improvement? I can see this as a real good thing to swap into a notebook too (having been bit twice now).

My current MB is an FIC (First International Computer, Inc.) K8M-800M

What's the word?