What Is Reverse Wireless Charging?
Reverse wireless charging lets your phone become a wireless charger for other devices. Learn how it works, which phones support it, and its limitations.
Reverse wireless charging turns the back of your phone into a Qi transmitter, letting you charge earbuds, watches, and other phones. Most phones support 4.5-9W reverse charging.
What Is Reverse Wireless Charging?
Reverse wireless charging (also called Wireless PowerShare on Samsung devices) is a feature that turns the back of your phone into a Qi wireless charging transmitter. Instead of charging your phone wirelessly, your phone charges other devices wirelessly.
It essentially reverses the energy flow: instead of phone receiving energy from a pad, the phone emits energy through its back panel to power compatible accessories.
How It Works
All phones with wireless charging contain a receiver coil. Reverse wireless charging requires an additional transmitter coil (or a bidirectional coil design) and the power management circuitry to drive it.
When activated, the phone switches its back coil from receive mode to transmit mode, generating a Qi-compatible magnetic field that compatible accessories can receive.
Enabling Reverse Wireless Charging
On Samsung Galaxy:
- Swipe down from the top of the screen
- Expand the quick settings tiles
- Tap Wireless PowerShare
- Place the accessory on the back of the phone (centre, glass side against glass)
On Google Pixel 8+:
- Settings > Battery > Battery Share
- Or via Quick Settings panel
What Can You Charge?
Any Qi-compatible device can be charged via reverse wireless charging:
- Galaxy Buds series and other Qi earbuds cases
- Galaxy Watch and other smartwatches with Qi
- Other smartphones (useful in emergencies)
- Qi-enabled accessories (rings, small devices)
Speed and Limitations
| Metric | Detail |
| Typical speed | 4.5W (Samsung S-series), up to 9W (Note series) |
| Galaxy Buds full charge | ~30-60 minutes |
| Galaxy Watch full charge | ~60-90 minutes |
| Battery drain on phone | Moderate — similar to intensive app use |
Most phones automatically stop reverse charging if the phone battery drops below 30% (configurable in some devices).