As demonstrated by Marques Brownlee, plugging a Lightning based iPhone into a USB-C iPhone 15 with a USB-C to Lightning cable lets the iPhone 15 provide power to the older iPhone.
When you plug a Lightning iPhone into an iPhone 15, the iPhone 15 will always provide power to the Lightning iPhone, even if the iPhone 15's battery is lower.
Have you ever wondered what happened when you plugged random things into the iPhone 15's new USB port? Well wonder no more
— Marques Brownlee (@MKBHD) September 19, 2023
Full iPhone 15/15 Pro Unboxing and first looks is now live: https://t.co/Q5loMQGoh1 pic.twitter.com/TUGh7jlg08
If you plug an iPhone 15 into another iPhone 15, the two devices communicate with one another, determine which iPhone has the lower battery, and transfer power that way. So if you have a low battery and a friend with an iPhone 15 has a full battery, you can plug your iPhone into your friend's iPhone and get yours to charge.
With a USB-C Android phone, if the Android device has USB Power Delivery support and you connect to an iPhone with a lower battery level, the Android device will be able to provide battery power. If the Android phone does not have USB PD, the result is inconsistent and there's no way to predict which phone will be the charger and which will get the charge.
The iPhone 15's USB-C port can be used to charge an Apple Watch or the AirPods Pro 2 with USB-C Charging Case using a USB-C to USB-C cord, and it should also be able to work with most other USB-C devices in some capacity.
Unfortunately, when charging another device with an iPhone 15, the charge is limited to 4.5W. That's appropriate for small devices like the Apple Watch, but it's not going to provide much power for an iPhone, so expect slow charging speeds when using iPhone to iPhone charging functionality.
This article, "PSA: An iPhone 15 Can Charge Another iPhone" first appeared on MacRumors.com
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