FIXYA volunteers will usually recommend paying a jeweler store in a shopping mall to replace the battery for you for a low fee.
If you insist on doing it yourself, open the watch, and the existing battery can be identified, and purchased online by searching Amazon and other sites.
Below is a video showing a flat screwdriver used to remove the battery.
https://www.leaf.tv/articles/how-to-replace-a-skagen-watch-battery/
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