Did you get Xiaomi wireless headphones out of the case, but the right earphone is dead and the left one is working fine? Or is the charging indicator flashing, but the battery percentage is not growing? This problem is familiar to many owners of Redmi AirDots, Mi True Wireless Earphones and others. TWS-In 80% of cases, the fault is not due to battery failure, but to software failures or mechanical contamination.
In this article, we’ll look at all the possible reasons why Xiaomi’s right-hand earphone refuses to charge, from the banal oxidation of contacts to hidden firmware errors, you’ll get step-by-step instructions for diagnosis and repair, and when to contact a service center. We will pay special attention to Xiaomi Buds models 3/4 Pro and Redmi Buds 4 Active where the problem is most common.
Before you rush to disassemble headphones or carry them to the workshop, check three key points: the cleanness of the case contacts, the density of the headphone and the firmware version. In 6 out of 10 cases, this is enough to solve the problem.
1.Contamination or oxidation of contacts is the most common cause
Contact areas on the headphone and inside the case eventually become covered with dust, sweat fat deposits or oxidized, leading to unstable connection and intermittent charging, especially for owners who wear headphones during training or outside.
How to check:
- 🔍 Visual inspection: Take a magnifying glass and flashlight on the contacts of the headphone and the socket in the case. Oxidation looks like green/white coating, and pollution looks like dark spots.
- 🧴 Conduction test: gently wipe the contacts with a cotton swab soaked in isopropyl alcohol (90%+). If the charge went after that, the problem was pollution.
- 🔋 Multimeter test: If you have a tester, measure the resistance between the contacts of the case. Norm: 0.5-2 ohms. Infinite resistance indicates a cliff.
For Xiaomi Buds 3 Pro and later, use a special electronics wipe – their contacts are covered with a protective layer that alcohol can damage. Complete with headphones comes cleaning fabric (if you have not lost it).
⚠️ Warning: Never use abrasive materials (paper sandpaper, metal brushes) or aggressive solvents (acetone, gasoline) to clean, which will damage the gilded contact coating and exacerbate the problem.
Mechanical damage: from falls to factory defects
If the right earphone stopped charging after a fall, impact or moisture, the cause may be:
- 💥 Cracks on the board - even a microcrack disrupts the power chain. Common in thin-body models (Redmi AirDots 2).
- 🌊 Corrosion after water - if the earphone gets wet, oxidation can spread to the inner tracks.
- 🔌 Torn contact plume - in budget models, the plumes are soldered poorly and break off with sudden movements.
How to diagnose:
- Shake the headphone – if you hear any extraneous noise or rattle, it is a sign of a detached part.
- Light a flashlight into the charging socket - if you see black soak, it is a short circuit.
- Try charging the headphone in the upside down position - if contact appears, the problem is mechanical backlash.
| Symptoms. | Probable cause | Can I fix it myself? |
|---|---|---|
| Charging is only at a certain angle. | Luft contacts or bent spring in the case | Yeah (neat spring bending) |
| The headphone warms up when charging | Short circuit or bloated battery | No (fire risk) |
| The indicator flashes red and goes out | Charging controller failure | Yeah (setting reset) |
| There is sound, but the battery is not charging. | Battery plus contact cut off | No (needs ration) |
⚠️ Warning: If the earphone smells like a burn or if the body has bloating, stop charging immediately. These are signs of a decomposition of the lithium-ion battery, which can lead to fire.
3. Software failures: when firmware is to blame
In 20 percent of cases, the problem is with the firmware of the headphones or the case.
- 🤖 Synchronization failure – after updating, the right earphone “falls off” from the case and is not defined as a chargeable device.
- 🔄 The charging controller freezes -- the indicator is on, but the current is not going.
- 📱 Conflict with the Mi Home app – if the headphones are tied to the account, resetting settings through the app can block charging.
How to fix it:
- Reset the headphones to factory settings: 1. Place both headphones in the case 2. Press the button on the case for 15 seconds (until white-red flashes) 3. Wait for the reboot (the indicator will turn blue)
- Update your firmware through Mi Home: Open the app → Devices → Your headphones → Software Update
- Untie the headphones from the Xiaomi account and tie them back.
Check the firmware version in Mi Home|Reset the headphones to factory settings|Remove the headphones from the list of devices and connect again|Update the Mi Home app to the latest version-->
For Xiaomi Buds 4 Pro and later, use the Xiaomi Earbuds app, which has more diagnostic tools. If the right earphone doesn't charge after reset, try a forced reset:
Compulsory reset for Xiaomi Buds 3/4
4. Battery problems: when to replace
Average battery life in TWS-Headphones: 2-3 years (300-500 charge cycles) If your Xiaomi is older, the problem may be in the future:
- 🔋 Capacity degradation - the headphone is charged to 100%, but discharges in 10 minutes.
- ⚡ Battery bloating - the headphone case has become wider, the case cover does not close tightly.
- 🔌 Battery contact break – often occurs after falls.
How to check the status of the battery:
- Completely discharge the headphone (until automatically switched off).
- Put it in a case and record the charging time to 100%. Xiaomi's rate is 40 to 60 minutes. If it's charging >2 hours, the capacity is down.
- Use the AccuBattery app (for Android) to analyze your charging schedule. Abrupt power surges indicate a malfunction.
⚠️ Warning: If the battery is swelling, don't try to prick it or disassemble it. Lithium polymer batteries can ignite if damaged. The only safe option is to replace it at a service center.
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To extend the life of the battery, avoid full discharge (charge at 20-30%) and do not leave the headphones on charging for more than 2 hours after reaching 100%.
5 Case malfunctions: why the headphone is not to blame
In 15 percent of cases, the problem is in the charging case, not the earphone itself.
- 🔌 Breakdown USB-port - the case does not charge itself, respectively, can not charge headphones.
- 🔋 Case battery failure - indicator burns, but the current does not go.
- 📶 Charging controller failure – the case only detects the left earphone.
How to diagnose:
- Connect the case to another cable and power supply, and if it's not charging, it's a problem in the port or the board.
- Try charging a case from Power Bank with Quick Charge support.Some Xiaomi models require high current.
- Take apart the case (carefully!) and check if the battery plume has disconnected. In Redmi AirDots 3, this is a common problem.
If the case does not show signs of life (the indicator does not burn, does not respond to the button), try emergency recovery:
- Connect the case to the charger.
- Press the button for 30 seconds.
- If the indicator flashed red, the controller is alive, but firmware is required.
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If the case charges but does not charge the headphones, 90% of the time the contacts inside the nests are to blame, and they can be gently bent with a thin screwdriver (only for power users!).
External factors: from temperature to substandard accessories
Sometimes the problem lies not in the headphones, but in the operating conditions:
- ❄️ Low temperature - at <0°C lithium-ion batteries refuse to charge. Let the headphones heat up to room temperature.
- ☀️ Overheating – if the case was under direct sunlight, the charging controller could work on protection.
- ⚡ Low-quality cable/power supply – use only original Xiaomi accessories or certified USB-C cable-backed 5V/1A.
- 📶 Electromagnetic interference – if a microwave or router is working nearby 5G, It can disrupt the charging process.
Run the test:
- Charge your headphones in another room (away from home appliances).
- Use a different cable and power supply (preferably from Xiaomi).
- Check the charging from USB-PC port – if everything works there, the problem is the power supply.
For models with wireless charging (Xiaomi Buds 3 Pro), make sure you use a compatible station. Some cheap Qi charging does not provide enough current.
7.When to contact the service: signs of a serious breakdown
If you’ve tried all the ways, but Xiaomi’s right-hand earphone still doesn’t charge, it’s time to contact the service.
- 🔥 The headphone heats up above 40°C when charging.
- 💨 From the case or earphone smells of burns.
- 🔋 The battery swelled (seems to deform the body).
- 📉 Charging is underway, but the earphone discharges in 5-10 minutes.
- 🔌 Case does not detect the right earphone even after resetting.
The cost of repairs in official Xiaomi services (for 2026):
| Type of repair | Cost (₽) | Date(s) |
|---|---|---|
| Replacement of the headphone battery | 800–1 200 | 1–2 |
| Case contacts repair | 600–900 | 1 |
| Replacement of headphone charge | 1 500–2 500 | 3–5 |
| Controller firmware | 500–700 | 1 |
Before the service visit:
- Take photos of headphones and case (especially if you see deformation).
- Keep a check or proof of purchase (for warranty repairs).
- Reset your headphones to factory settings (this is required in 90% of services).
⚠️ Warning: Don't accept repairs in informal workshops if they offer "re-sweeten the battery for 300 rubles." In 70% of cases, after such repairs, the headphones work 1-2 weeks, then the problem returns. Official services give a guarantee of 3-6 months.