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It does much more than keep the clock going. At least for Macs. It maintains the PRAM, if not more. On some models, if something "disturbs" the PRAM, the computer "dies." To resuscitate, one must
remove the batt. and press the reset button for a while, then replace the batt. I got a 7250 server a few years ago for a song, because the owner (media services at UCSC!) didn't know this. I bought
it for just the expensive multiscan monitor, and tried this before I was going to throw it away.