Charging iPhone with MacBook’s adapter
Does using a 61W adapter affect the battery health of my iPhone 12 Pro Max? I don’t want the higher power output to adversely affect the battery health of my iPhone.
iPhone 12 Pro Max, iOS 14
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See the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.
and also see: Fast charge your iPhone - Apple Support