Apple Watch charger
Can I charge my Apple Watch using an iPhone charger?
Apple Watch, watchOS 4
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If you mean an iPhone Qi wireless charger, then "No". They use a different wireless charging technology.
If you mean the wall plug that has a USB plug on it, then sure.
But you need the Apple Watch cable and magnetic charger (or a 3rd party unit that works with the Apple Watch).
You can also use a USB port on a computer as long as it provides power, or one of the car to USB power adapters, etc...
