Apple's next iPhone will be able to charge other Apple gadgets by placing them back-to-back with one another, according to a new report.

A new investor note from reliable Apple analyst Ming-Chi Kuo, seen by 9to5Mac , states that all three new iPhones in 2019 will support "bilateral wireless charging".

This means that users will be able to place wireless charging-enabled devices on the back of their iPhone, and the phone will share power to that device.

So if your AirPods run out of charge on a long journey, for example, or a friend's iPhone is out of juice, you will able to give them a quick power boost.

In order to support two-way wireless charging, Kuo says that all three new iPhones will also get bigger batteries.

The analyst predicts that the 5.8-inch iPhone's battery will increase by 20-25%, and the 6.5-inch iPhone Max's battery will increase by 10-15%.

The battery in the 6.1-inch iPhone - the successor to the iPhone XR - will increase by just 0-5%, according to Kuo.

It's not clear whether bilateral wireless charging on the new iPhones will work with non-Apple gadgets.

However, Apple's current iPhones use the standardised form of wireless charging, known as "Qi", so theoretically any device that supports this standard could be charged this way.

That includes Samsung's latest Galaxy S10, which also includes support for bilateral wireless charging.

Samsung claims that the "Wireless PowerShare" feature on Galaxy S10 makes it possible to easily charge Qi-certified smartphones and even compatible wearable devices such as Galaxy Buds.

In addition, Galaxy S10 is capable of charging itself and a second device simultaneously, while connected to a regular charger, enabling you to leave your second charger at home while on a trip.