Mac SE NVRAM battery removal

[Jules Richardson]

So I'm working my way (more slowly than I probably should be) through my 
systems, ditching ancient on-board batteries before they leak...

In the case of the Mac SE's, are there any critical settings which I should 
make a note of before removing the on-board battery? Should I expect any 
issues trying to run the machines without? (I'm not inclined to replace 
batteries unless I have to, just so I don't have to worry about replacement 
again in x years time)

cheers

Jules