How come a battery powered watch can run slow?

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I stuck a battery powered watch in my safe a couple months back and just pulled it back out to find that it’s running about two minutes behind true Atomic time. I figure that the only thing the watch is supposed to do is know exactly how long a second is, but it’s now off by more than 100 seconds.

So my question is, does dark and cold temperatures make the Watch run slower? How does that work?

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