apple watch series 8
apple watch is not turning on after long days of not using it series 8
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Did you already have a look at the troubleshooting tips mentioned in this article?
If your Apple Watch won't turn on or won't charge - Apple Support
Has the battery of your Series 8 ever been replaced?
Depending on the age and use, the battery might be defective, if it is not charging anymore.
Letting the battery drain completely can damage it.