ANSWERS: 2
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Yes, if your watch is made so it stops running when you pull the stem out.
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The power consumed by your watch is so low that I don't feel it is worth the effort of removing the battery to prolong its life. Also, depending on the quality of the battery, it has a limited shelf life during which time it will self discharge. If you have a flat watch battery and you can't get one readily you can get some extra life from it by VERY BRIEFLY applying a few pulses of current to it by connecting it to another battery(eg 12V ), plus to plus and minus to minus. The watch battery may get warm but DON'T allow it to get hot. Allow it to cool before you apply it to the watch again and if you have a multi-meter check its voltage. It should be close to the nominal voltage. Clean the battery by breathing on it and wiping it with a clean tissue. Persperation can cause corrosion of the battery but even worse on the contacts in the watch. TG
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