Xiaomi Mi 9 is the flagship smartphone of 2019, which supports wireless charging standard Qi power up to 20 watts. However, many users face problems when connecting for the first time: the phone does not charge, warms up or charging is too slow. In this article, we will discuss how to properly turn on and configure wireless charging, which adapters are suitable for the Mi 9, and what to do if the function does not work.
Checkpoint: Xiaomi Mi 9 supports wireless charging out of the box, but it requires an original or certified adapter with a power of at least 10 watts. If you use a cheap fake, the smartphone may refuse to charge or even display a warning about incompatibility.
1. Verification of compatibility of Xiaomi Mi 9 with wireless charging
Before you buy an adapter, make sure your Mi 9 does support wireless charging. In some regional versions (e.g. India), this feature could have been disabled at the firmware level.
- 📄 Documentation: Find the box from the phone – the sticker with specifications should indicate Wireless Charging or Qi.
- 🔍 Settings: Go to Settings → The phone. → All specifications. The battery section should have the line Wireless charging: Yes.
- 🛠️ Test: Try putting your phone on a known adapter (for example, in a service center). If charging does not begin, the problem may be in the firmware.
If the specs don’t mention wireless charging, but you’re sure you’ve bought an international version of the Mi 9, try upgrading to the latest version of MIUI.
2.What adapters are suitable for Xiaomi Mi 9
Not all wireless chargers are equally efficient. Xiaomi Mi 9 supports the Qi standard, but for maximum charging speed (20 watts) you need an adapter with the appropriate power.
| Adapter type | Power | Compatible with Mi 9 | Notes |
|---|---|---|---|
| Xiaomi Wireless Charger (20 watts) | 20 W. | ✅ Complete. | It's the best option, but it's expensive. It comes with a power supply. |
| Certified Qi adapters (10–15 W) | 10-15 W. | ✅ Partial | Charging will be slower but safe. Examples: Anker PowerWave, Belkin Boost Up. |
| Cheap Uncertified Adapters | 5-10 W. | ❌ Risky. | They might not start charging or damage the battery. They're often warmed. |
| Car wireless charging | 5-7.5 W | ⚠️ Limitedly. | Suitable for recharging, but not for full use. |
Important: Xiaomi Mi 9 does not support reverse wireless charging (like the Mi 9 Pro 5G), so charging other devices from your smartphone will not work.
⚠️ Warning: If the adapter is squeaking high-frequency or is heated (over 40)°C, immediately disable it.This is a sign of incompatibility or defect that could damage the phone's power controller.
3. Step-by-step instruction: how to turn on wireless charging
The process of activating wireless charging on the Xiaomi Mi 9 is as simple as possible, but there are several nuances that affect the stability of the work.
- Prepare the adapter: Connect the wireless charging station to a power source (outlet or power bank). Make sure the indicator on the adapter is on or flashing, which means it is on.
- Position: Place the Mi 9 centered on the charging pad. Optimal position is upward, but some adapters also work horizontally.
- Automatic recognition: In 2-5 seconds, a wireless charging notification with a charge indicator should appear on the phone screen. If this does not happen, try to move the phone 1-2 mm to the side.
- Speed check: In the battery settings (Settings → Battery), you can see the current charging power. The normal for the original adapter is 18-20 watts.
If charging does not start, try the following steps:
- 🔌 Restart the phone and adapter (turn off/on the charging station power).
- 📱 Remove the case – thick or metallized covers can block the signal.
- 🔄 Change the power source (for example, connect the adapter to another socket or use a different power supply).
☑️ Checklist before first charging
4.Why wireless charging on the Mi 9 doesn't work: Common bugs
Even if it's done according to the instructions, the charging might not start.-5 causes and ways of eliminating them:
| Problem. | Possible cause | Decision |
|---|---|---|
| Charging doesn't start. | Incompatible adapter or power supply | Use the original Xiaomi Wireless Charger or a certified Qi adapter with ≥10 watts. |
| The phone is warming and shutting down. | Overheating due to poor contact or cover | Take off the case, make sure the adapter isn't covered by cloth. |
| Slow charging (<5 W) | Insufficient power supply unit | Connect the adapter to the power supply at 18+ watts (for example, from a laptop). |
| Charging is interrupted | Poor Positioning of the Phone | Try to move the phone 1-2 mm or use a rack with a magnetic mount. |
| The error "Incompatible device" appears | Adapter not certified by Qi | Replace the adapter with an original or proven brand (Anker, Belkin). |
If none of these things worked, the problem could be a firmware or a hardware malfunction.
- Update MIUI to the latest version via Settings → System Update.
- Reset network settings: Settings → System → Reset settings → Reset network settings.
- Contact Xiaomi Service Center for Wireless Charging Controller Diagnostics.
⚠️ Warning: If, after connecting to wireless charging, the phone starts to discharge or turn off quickly, immediately stop using the adapter.This may indicate a short circuit in the power supply chain, which is dangerous for the battery.
💡
If you use wireless charging frequently, turn off the Charging Optimization feature in the battery settings. It can artificially limit current, reducing the charging speed.
5. How to speed up wireless charging on Xiaomi Mi 9
The maximum wireless charging speed for the Mi 9 is 20 watts, but in practice it is often lower. To get close to this value, follow these tips:
- 🔋 Use the original power supply: Adapter Xiaomi Wireless Charger is equipped with a unit of 27 watts. if you connect it to a weak source (for example, USB-PC port, speed will drop to 5 watts.
- ❄️ Control the temperature: Heating above 35°C controller automatically reduces current. Charge your phone in a cool place, without direct sunlight.
- 📵 Turn off background processes: Close resource-intensive applications (games, navigators) while charging. They load the processor, which increases heat generation.
- 🔄 Proper Positioning: Experiment with the position of the phone on the site. Sometimes a shift of several millimeters increases the speed from 10 watts to 15-18 watts.
To check the current charging speed:
- Activate Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
- Return to Settings → Additional → For developers and enable USB Debugging and Charging Status.
- During charging, pull down the notification panel – there will appear the current power in watts.
What to do if the charging speed drops over time?
6. Alternative charging methods: when wireless method is not suitable
Wireless charging is convenient, but not always practical. Here are the best cases to use a wired method:
- 🚗 In the car: Wireless car charges usually only give out 5W, which is too little for the Mi 9. USB-C Support for Quick Charge 4+.
- ⚡ Urgent charging: If you need to quickly restore charge (for example, before exit), wired charging at 27 watts will cope 2 times faster.
- 🔋 Long-term storage: If the phone lies idle for more than a week, wireless charging can lead to battery degradation due to constant heating.
- 💻 Use while charging: When used actively (games, video) wireless charging may not cover the energy consumption and the phone will run out.
If you still prefer the wireless method, consider buying a multifunction charging station that supports:
- 📱 Simultaneous charging of the phone and headphones.
- 🖥️ Built-in USB-hub.
- ⏱️ Auto-Switch Off Timer (Useful for Night Charging).
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Wireless charging is convenient for night use or office desk, but for quick charge recovery it is better to use the original 27W wired adapter.