Hey there JemmyFeen,
Thanks for reaching out to the Apple Support Communities. We understand you're having issues with your Apple Watch not charging as expected, and we'd be happy to help.
To get started, check out the steps listed in the following resource that may help: If your Apple Watch won't charge or it won't turn on - Apple Support
Also if possible, do you have another charging cable and/or adapter you can test the issue with? This can help to determine if we need to look into Apple Watch further, or available options for your Apple Watch charger.
We look forward to hearing back from you.
Take care!