This guide shows you how to charge your smart watch with your phone using reverse wireless charging. You’ll learn which devices support it, how to set it up safely, and how to troubleshoot common issues.
Key Takeaways
- Not all phones and smart watches support reverse charging: Check your device compatibility before attempting to charge.
- Enable reverse wireless charging on your phone: This feature is usually found in the battery or settings menu.
- Align the devices properly: Place the smart watch in the center of the phone’s back for optimal charging.
- Use original or certified accessories: Non-certified chargers or cases may block charging or damage devices.
- Monitor battery levels: Charging a smart watch with your phone drains the phone’s battery quickly—use sparingly.
- Keep devices cool: Avoid charging in hot environments to prevent overheating and battery damage.
- Troubleshoot common issues: If charging fails, check alignment, battery level, and software updates.
How to Charge Smart Watch with Phone: A Complete Guide
Imagine this: you’re out for a morning run, your smart watch is at 10% battery, and you forgot your charger at home. But wait—you have your phone in your pocket. Could it be possible to charge your smart watch using your phone? The answer is yes, thanks to a feature called reverse wireless charging.
This guide will walk you through how to charge your smart watch with your phone step by step. Whether you’re using an Apple Watch, Samsung Galaxy Watch, or another compatible model, we’ll cover everything from checking compatibility to troubleshooting issues. By the end, you’ll know exactly how to use your phone as a backup power source for your smart watch—no extra cables or chargers needed.
What Is Reverse Wireless Charging?
Reverse wireless charging is a technology that allows your smartphone to act as a wireless charging pad. Instead of drawing power from a wall outlet, your phone uses its own battery to send energy to another device—like a smart watch, earbuds, or even another phone—via electromagnetic induction.
Visual guide about How to Charge Smart Watch with Phone
Image source: d1ezz7hubc5ho5.cloudfront.net
This feature is especially useful in emergencies or when you’re traveling light. For example, if your smart watch dies during a hike, you can quickly top it up using your phone. However, it’s important to note that reverse charging is slower than using a dedicated charger and drains your phone’s battery significantly.
Which Devices Support Charging Smart Watch with Phone?
Not all phones and smart watches are compatible with reverse wireless charging. Before you try to charge your smart watch with your phone, you need to confirm that both devices support the feature.
Compatible Smartphones
Most flagship Android phones from the past few years include reverse wireless charging. Here are some popular models that support it:
- Samsung Galaxy S21, S22, S23, and S24 series – Known as “Wireless PowerShare”
- Google Pixel 6, 7, 8, and 9 series – Called “Battery Share”
- OnePlus 9, 10, 11, and 12 – Features “Reverse Wireless Charging”
- Xiaomi Mi 11, 12, 13, and 14 – Offers “Mi Wireless Reverse Charging”
- Huawei P40, Mate 40, and P50 series – Includes “Wireless Reverse Charging”
Apple iPhones, unfortunately, do not currently support reverse wireless charging. While the iPhone 15 and newer models have strong magnets for MagSafe, they cannot charge other devices wirelessly.
Compatible Smart Watches
Most modern smart watches that support wireless charging can be charged using a phone with reverse charging. These include:
- Samsung Galaxy Watch 4, 5, 6, and Active series
- Google Pixel Watch and Pixel Watch 2
- Apple Watch Series 4 and newer (Note: iPhone cannot charge Apple Watch via reverse charging)
- Fossil Gen 6, Garmin Venu 3, and other Qi-compatible watches
Always check your device’s user manual or manufacturer website to confirm compatibility. Some older or budget models may not support wireless charging at all.
Step-by-Step Guide: How to Charge Smart Watch with Phone
Now that you’ve confirmed your devices are compatible, let’s walk through the process of charging your smart watch using your phone. Follow these steps carefully for the best results.
Step 1: Check Battery Levels
Before you begin, make sure your phone has enough battery to spare. Reverse charging can drain your phone’s battery quickly—sometimes losing 10–15% in just 30 minutes. We recommend your phone has at least 50% battery before starting.
Also, ensure your smart watch has some charge left. Most watches won’t accept a charge if the battery is completely dead. If your watch is off, try turning it on first.
Step 2: Enable Reverse Wireless Charging on Your Phone
The exact steps vary by phone model, but here’s how to enable the feature on the most common devices:
Samsung Galaxy (Wireless PowerShare)
- Swipe down from the top of the screen to open the Quick Settings panel.
- Look for the “Wireless PowerShare” icon (it looks like a battery with waves).
- Tap it to turn it on. A notification will appear confirming it’s active.
- Alternatively, go to Settings > Battery > Wireless PowerShare and toggle it on.
Google Pixel (Battery Share)
- Open the Settings app.
- Tap Battery > Battery Share.
- Toggle on “Battery Share”.
- You’ll see a prompt confirming the feature is active.
OnePlus (Reverse Wireless Charging)
- Go to Settings > Battery.
- Tap “Reverse Wireless Charging”.
- Toggle it on and confirm.
Xiaomi (Mi Wireless Reverse Charging)
- Open Settings
- Tap Battery > Reverse Charging.
- Turn on the feature and follow any on-screen instructions.
Once enabled, your phone will be ready to charge other devices wirelessly.
Step 3: Prepare Your Devices
For successful charging, both devices need to be in the right condition:
- Remove thick cases: Phone cases thicker than 3mm or made of metal can block wireless signals. Remove them if possible.
- Clean the surfaces: Wipe the back of your phone and the charging area of your smart watch with a soft, dry cloth. Dust or debris can interfere with charging.
- Turn off power-intensive apps: Close background apps like GPS, streaming, or gaming to reduce battery drain on your phone.
Step 4: Align the Smart Watch on the Phone
Proper alignment is crucial. The charging coils in both devices need to be close and aligned for energy transfer.
- Place your phone on a flat, stable surface with the screen facing down.
- Turn your smart watch so the back (charging side) is facing up.
- Gently place the smart watch in the center of the phone’s back. This is where the wireless charging coil is usually located.
- You may feel a slight vibration or hear a sound when the connection is made (on some devices).
Tip: On Samsung phones, a small animation appears on the screen showing the charging status. On Pixel phones, a notification pops up.
Step 5: Monitor the Charging Process
Once aligned, your smart watch should begin charging. You’ll see the battery icon on the watch screen increase, or a charging indicator may appear.
Keep the devices still during charging. Moving them can break the connection. If charging stops, reposition the watch and try again.
Charging speed is slow—expect about 5–10% per 30 minutes, depending on the devices. It’s best used for emergency top-ups, not full charges.
Step 6: Stop Charging When Done
When your smart watch reaches a safe level (e.g., 30–50%), or when your phone’s battery drops below 20%, it’s time to stop.
To turn off reverse charging:
- On Samsung: Tap the Wireless PowerShare icon again or go to Settings > Battery > Wireless PowerShare and toggle it off.
- On Pixel: Go to Settings > Battery > Battery Share and turn it off.
- On OnePlus/Xiaomi: Return to the Battery settings and disable the feature.
Remove the smart watch from the phone and store both devices properly.
Tips for Efficient and Safe Charging
To get the most out of reverse wireless charging and protect your devices, follow these best practices:
Use Original or Certified Accessories
Avoid using cheap or uncertified phone cases, screen protectors, or charging adapters. These can interfere with wireless signals or cause overheating. Stick to manufacturer-recommended accessories.
Charge in a Cool Environment
Heat is the enemy of battery health. Avoid charging in direct sunlight, inside a car on a hot day, or near heaters. High temperatures can damage both your phone and smart watch batteries over time.
Don’t Charge Overnight
Never leave your phone charging your smart watch overnight. Reverse charging generates heat and drains your phone’s battery completely, which can reduce its lifespan.
Use Only When Necessary
Reverse charging is a backup solution, not a primary charging method. Rely on your smart watch’s dedicated charger for daily use. Reserve phone-to-watch charging for emergencies or travel.
Update Your Software
Manufacturers often release software updates that improve charging efficiency and fix bugs. Make sure both your phone and smart watch are running the latest firmware.
Troubleshooting Common Issues
Even with compatible devices, you might run into problems. Here’s how to fix the most common issues when trying to charge your smart watch with your phone.
Issue 1: Smart Watch Isn’t Charging
Possible Causes:
- Devices aren’t aligned properly
- Phone case is too thick
- Reverse charging is disabled
- Battery is too low on either device
Solutions:
- Reposition the smart watch in the center of the phone.
- Remove the phone case and try again.
- Double-check that reverse charging is enabled in settings.
- Ensure both devices have at least 20% battery.
Issue 2: Charging Stops After a Few Seconds
This often happens when the connection is unstable.
Solutions:
- Keep both devices completely still.
- Use a flat, non-slip surface.
- Try turning off Bluetooth and Wi-Fi on your phone to reduce interference.
Issue 3: Phone Gets Very Hot
Some heat is normal, but excessive heat is a concern.
Solutions:
- Stop charging immediately.
- Let both devices cool down.
- Avoid using the phone for other tasks while reverse charging.
- Charge in a cooler room.
Issue 4: Smart Watch Shows “Charging” but Battery Doesn’t Increase
This could mean the connection is too weak.
Solutions:
- Clean the charging surfaces.
- Ensure no metal objects (like keys or coins) are nearby.
- Try a different location with less electromagnetic interference.
Issue 5: Reverse Charging Option Is Missing
If you can’t find the feature in settings:
- Confirm your phone model supports it (see list above).
- Check for a software update—some features are added in updates.
- Restart your phone and check again.
Is It Safe to Charge Smart Watch with Phone?
Yes, reverse wireless charging is generally safe when used correctly. However, there are a few risks to be aware of:
- Battery Drain: Your phone’s battery will deplete quickly. Avoid using it for other tasks while charging.
- Overheating: Prolonged use can cause heat buildup. Stop if devices feel too warm.
- Battery Wear: Frequent deep discharges can shorten your phone’s battery life over time.
To minimize risks, use reverse charging only when necessary and monitor both devices closely.
Alternatives to Reverse Charging
If your phone doesn’t support reverse charging, or you want a faster, more reliable option, consider these alternatives:
- Portable Power Banks: Small, lightweight power banks with wireless charging pads can charge your smart watch on the go.
- Magnetic Charging Cables: Many smart watches come with magnetic chargers that are easy to carry.
- Multi-Device Chargers: Some charging pads can charge your phone, watch, and earbuds simultaneously.
- Solar-Powered Chargers: Great for outdoor adventures, though slower and weather-dependent.
These options are often more efficient and safer than relying on your phone’s battery.
Final Thoughts
Learning how to charge your smart watch with your phone is a handy skill that can save you in a pinch. With reverse wireless charging, you turn your smartphone into a portable power source—no extra gear required.
Just remember: this feature is best used sparingly. It’s slow, drains your phone’s battery, and can generate heat. Always prioritize using your smart watch’s official charger for daily use.
But when you’re far from an outlet and your watch is about to die, knowing how to use your phone as a backup charger can be a real lifesaver. Just make sure your devices are compatible, follow the steps carefully, and keep an eye on battery levels and temperature.
Now you’re ready to charge smarter—not harder.