If I charge my iPhone 11 pro with a MacBook charger, can I damage the battery?
If I charge my phone (iPhone 11 pro) with a 30w charger (MacBook charger) can I damage the battery?
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No. 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.
Also see: Fast charge your iPhone - Apple Support