That's probably about the age of one of the firewall systems - it doesn't need to be any faster (I think it's an AMD K6) for the job that it does, and it's in a nice shoebox-sized case so can sit neatly on the shelf. My main data-recovery system's a few years older than that, kept because it does what I need (where modern systems wouldn't) and I have a few spares for it.
My oldest machines are over 30 years old now, but as they don't even have any kind of battery they're probably not relevant :-)
As salty says, I think AAs would be worse (and AAAs worse still), but maybe for the OP it's a convenience thing (I can never find one of those
2032's kicking around when I need it. Not sure sure about AAAs though, I don't think I have a single thing that takes 'em)cheers
Jules