Can I use a 65 watt charger in an Apple Watch?
Does it matter what size charger to use, I.e. can I use a 65 watt charger in an Apple Watch?
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You can use the 65 watt power adapter with an Apple Watch.
Also see the following from Charge your iPhone with the USB power adapter of an iPad or Mac laptop - Apple Support
You can use Apple USB power adapters for iPad and Mac laptops to charge iPhone, Apple Watch, AirPods, and other Apple products.