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Most mechanical wristwatches currently being manufactured are "self-winding watch", also called "automatic watch".

Some electronic wristwatches are "automatic quartz watch".

Both kinds of wristwatches convert the motion -- of the person wearing it -- into the energy to run it.

When set down, the energy reserve in such a watch will eventually run out and the watch will stop.

(The mainspring of such mechanical watches typically stores enough energy to keep the watch running for roughly two days. The storage capacitor of such quartz wristwatches typically stores enough energy to keep the watch running for at least two weeks).

If the watch is mechanical, it would reqire the user to regularly wear it, so that its spring can be wound up by mechanical movement. If it is electronic, it could be a sign that either the contacts for the battery in the watch loose, or that the battery is losing power.

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14y ago

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