Cosmotron Battery Life

Battery life for Citizen’s electro-mechanical watches was advertised as 12 month. I have run one of mine constantly to see what period of time I would get. Here’s the watch, from 1975:

It had a new battery fitted by the seller when I bought it in May 2010, and it ran out of juice yesterday. So I got more than 18 months from the battery – not too bad at all  🙂

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