Charging a smartphone with a cell phone: This is how electricity sharing works You want to charge your smartphone, but you don’t have a socket nearby, a charging cable or a power bank at hand? What would have been a problem a few years ago is now a thing of the past for owners of current Samsung and Huawei smartphones: Thanks to the further development of wireless charging, selected smartphones can be used as a power source for other devices. Sounds like a dream of the future, but it has long been real!
When the cell phone becomes a power bank
Until a few years ago, we used to charge our smartphones with a cable as a matter of course. Then inductive charging became marketable, and since then the function has been standard on most new smartphones.
The next step in the evolution of charging technology is now pending: wireless power sharing or reverse charging . Instead of an inductive QI charging station, the smartphone acts as a wireless energy supplier. The mobile phone itself becomes a power bank for all QI-enabled devices.
Even if this technology has not yet been used by all major smartphone manufacturers, one thing is certain: This could be the way we charge our cell phones in the future. How the technology behind it works, which smartphones support mutual charging and how to activate the function is explained below!
Wireless charging: the technology behind it
We owe the fact that charging without a cable is possible at all to wireless charging technology – also known as inductive charging or Qi charging . Both the mobile phone and the charging station have an electromagnetic coil installed. If both devices come into contact, the coils react with each other and generate electricity directly in the mobile phone.
Wireless power sharing or reverse charging makes use of this process: the smartphone with the new function serves as the energy supplier, another as the receiver. Important: The recipient cell phone must also support inductive charging!
If the function is now activated in the donor cell phone and the cell phones are placed next to each other, the same thing happens as with conventional Qi charging: The coil in the receiving cell phone is driven, generates electricity and thus charges its own battery.
So there is no direct power transmission, instead we generate “new” power in the recipient cell phone. However, this process results in a small loss of energy: a fully charged donor mobile phone cannot therefore charge a mobile phone with the same characteristics from 0% to 100%.
In addition to smartphones, all other technical devices that have the QI standard can be charged in this way. This includes all common smartwatches, various tablets, Bluetooth headphones and other QI-enabled gadgets.
So aktivierst du Wireless PowerShare
Electricity sharing technology is still relatively new. Pioneers and current market leaders in the field are Samsung with the Wireless PowerShare feature and HUAWEI with “reverse charging”. Although the functions have different names, the way they work is the same: they charge other devices simply by hanging them up. You can find out which models can do this and how to do it here:
Setting up Wireless PowerShare on Samsung smartphones
The term “Wireless PowerShare” was introduced by tech giant Samsung and has become a part of common parlance. Samsung was one of the first companies to address the issue of power sharing and made the technology available to the masses. The feature is available for the foldable Samsung Galaxy Fold, the Galaxy S10 and S20 models and the Galaxy Note 10 models, among others. The new Samsung Galaxy S21 is also equipped with the Wireless PowerShare function. Other models are to follow.
Charging via Wireless PowerShare:
1. Pull down the quick settings status bar from the top.
2. Tap on “Wireless PowerShare” the function is now activated.
3. Place the back of the device to be charged in the middle of the back of this smartphone. After a short wait, a small vibration in combination with a short tone will confirm the successful connection of the devices. The loading process starts.
Note that both devices must be in constant contact with each other for successful charging. External charging also requires a minimum amount of battery capacity.
Enable reverse charging with HUAWEI
Even before Samsung, HUAWEI launched its smartphones with the reverse charging function . They were the first in the world to allow one cell phone to be charged with another. The feature is available for the HUAWEI Mate 20 Pro, HUAWEI Mate 30 / P30 Pro and HUAWEI Mate P40 Pro, among others.
Loading via reverse loading:
1. Open the system settings of your smartphone.
2. Tap on the “Battery” menu item.
3. Scroll all the way down and select Wireless Reverse Charging.
Place the back of the device to be charged in the middle of the back of this smartphone. After a short waiting time, the charging process starts.