Can I use 20w fast charger on the iPhone 7 Plus?
Can i use 20watt fast charger on the iphone 7 plus?
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You can use a 20W power adapter for an iPhone 7 but it will not Fast Charge. See the following from Fast charge your iPhone - Apple Support
You can fast charge your iPhone 8 and later up to 50 percent battery in around 30 minutes.1