How iPhone 15’s USB-C Port Enables Reverse Charging for Other Devices

Apple’s iPhone 15 series introduced a USB-C port, enabling a lesser-known feature: reverse charging. According to Apple’s official documentation, compatible models can supply up to 4.5 watts of power through the USB-C port, allowing users to charge other devices in emergencies. This functionality, while not widely publicized, offers practical benefits for Apple and Android users alike.

What Devices Can Be Charged via iPhone 15’s USB-C Port?

Apple’s ecosystem benefits most from this feature. The iPhone 15 can charge Apple AirPods Pro, Apple Watch Series 10, and iPad Air models using a compatible USB-C cable. During the iPhone 15 Pro launch, Apple highlighted that devices communicate automatically to prioritize charging the one with the lowest battery, requiring no user intervention. For example, a user on a flight could extend AirPods’ battery life without a power bank.

Can One iPhone Charge Another iPhone?

Yes, but with limitations. Connecting two USB-C-equipped iPhones via a standard cable allows the device with higher battery life to transfer power to the lower one. According to TechCrunch, this process is slow—typically adding just a few percentage points—but sufficient for emergency calls or navigation. Older models like the iPhone 14 require a USB-C to Lightning adapter.

How Does the iPhone Charge a Power Bank?

Modern power banks supporting USB Power Delivery can receive or supply power via USB-C. In some cases, connecting a power bank to an iPhone 15 may trigger the phone to charge the bank instead, as noted by The Verge. While this scenario is rare, it demonstrates advancements in device energy management. However, the 4.5W output is insufficient for full power bank recharging, making it a niche use case.

Can an iPhone Charge Android Devices?

Yes. USB-C’s universal adoption allows an iPhone 15 to charge Android smartphones like Samsung Galaxy or Google Pixel models. The USB Power Delivery protocol automatically determines which device needs power. While the 4.5W output is slow compared to dedicated chargers, it can provide critical minutes of battery life during travel, according to CNET.

What About Low-Power USB-C Accessories?

The iPhone 15’s reverse charging works with any USB-C device requiring low power. Examples include Amazon Kindle Paperwhite e-readers, Bluetooth earbuds, and portable speakers. However, high-power devices like laptops cannot be charged effectively due to the 4.5W limit, as confirmed by Apple’s technical specifications.

Why Is This Feature Important for Users?

While not as fast as traditional chargers, reverse charging offers a safety net for users without access to power outlets or power banks. According to a 2023 survey by Pew Research, 68% of smartphone users experience battery anxiety. This feature addresses that concern, albeit modestly. It also highlights Apple’s shift toward USB-C, aligning with industry standards while retaining unique ecosystem advantages.