For several months we have heard more and more about so-called reverse wireless charging, an innovative feature included in some new smartphones that allow you to wirelessly charge other devices, including smartphones, smartwatches, and other accessories. But how does it work exactly? And what devices support it?
Now there are two ways to charge your smartphone: via cable or wireless charging. This latter method, in particular, manages to transfer energy to the receiver device by electromagnetic induction. In recent months, however, we’ve heard more and more about reverse wireless charging, and many are wondering what the difference is with classic wireless charging.
Let’s start by saying that there is no difference. Reverse wireless charging allows smartphones to become small charging stations, so they can be used to charge other devices without wires. This feature debuted on the Huawei Mate 20 Pro, followed soon after by Samsung’s Samsung S10 line and, once again, by Huawei’s P30 Pro, but is expected to be present on most flagship smartphones in 2019.
How fast is the reverse wireless charge?
In short: reverse wireless charging is not so fast. In fact, it is a low power consumption solution for emergency recharges, for example, when a friend needs a little more charge and does not have a power bank or a charger at hand. Or, it’s useful when you want to charge accessories, like some wireless headphones (for example, the Galaxy Buds or the new Apple AirPods).
Despite the fact that fast charging (cable) technology has progressed a lot over the years (just think of the 50W Super VOOC of OPPO Find X Lamborghini Edition), the maximum possible Qi wireless recharge is from 20W, although most wireless chargers in the market do not even exceed 10W. Therefore, if the Super VOOC can charge a 3,000 mAh battery in 30 minutes, with a wireless charger you will get the same result in approximately 120 minutes.
Reverse wireless charging, on the other hand, does not have power standards, but we can confirm that both Huawei and Samsung are not that fast. The Mate 20 Pro can deliver up to 2.5W to 3W output, while the Galaxy S10 can be charged up to 4W wirelessly in reverse. Also, unlike a classic wireless charger, the source device will always have an energy limit: its own battery.
Which smartphones have reverse wireless charging?
Huawei Mate 20 Pro
The first smartphone that can support reverse wireless charging technology and then charge other devices using the Qi standard is the Huawei Mate 20 Pro. This device, introduced in October 2018, has a battery of 4,200 mAh, so it’s enough to fully charge a pair of truly wireless headphones and arrive at night without any problem.
Huawei P30 Pro
The Chinese manufacturer has also passed this functionality to its latest flagship presented at the end of March, the Huawei P30 Pro. Similar to the Mate 20 Pro in many aspects, this device is famous for its excellent photography, which is considered the undisputed king of Smartphone cameras at this time.
Samsung Galaxy S10, S10+ and S10e
Why offer only one device while being compatible with reverse wireless charging? During the first Unpacked event in 2019, Samsung introduced three new smartphones from the Galaxy S10 family, which make all three capable of charging other wireless devices. In addition, for users who pre-ordered S10 or S10 +, the South Korean manufacturer has given them the Galaxy Buds that, as we said earlier, can be recharged wirelessly.
What devices can I load with the reverse wireless charge?
There is no limit to what can be recharged through this technology. If your smartphone, headset, mouse or any other accessory is compatible with the Qi wireless charging standard, you can receive power safely from devices equipped with reverse wireless charging.