How to charge my Apple Watch
How to charge my first Apple Watch
iPhone 13, iOS 15
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Follow these steps:
Check your battery and charge your Apple Watch - Apple Support
You may need to use a computer with a USB-C port or purchase a USB-C power adapter such as:
Buy 20W USB-C Power Adapter - Apple
Note: if you have a previous USB-A charging system, you can use that as well. You will simply lose the fast charging feature, Since I charge mine overnight, every night that feature is unimportant to me.