My Apple Watch when connected to a lap top will not charge up
Do a need to buy an adapter to a wall plug to charge my I watch?
Apple Watch SE, watchOS 9
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If your iPhone (or other device) charges from the laptop port then your watch should charge as well. It could be the cord that that charges your watch. If you followed all the steps in:
If your Apple Watch won't charge or it won't turn on - Apple Support
If you still need help, contact Apple Support.
Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple