Why not charge one headphone Xiaomi: reasons and solution

When one headphone from a pair of Xiaomi stops charging, it is one of the most common problems of wireless speakers. It can happen suddenly, after a walk in the rain, or manifest itself after a long idle device in the drawer. Owners of models Redmi AirDots, Mi True Wireless Earbuds and other series often face the fact that the indicator on the case does not light up, or the earphone simply does not respond to the installation in the charging compartment.

In most cases, the problem is not a physical battery failure, but a contact failure or a software failure of the power controller. Contact oxidation is the first thing that comes to mind, but there are deeper reasons to calibrate the battery. It is important to understand that modern TWS-Headphones have a complex logic of operation, where charging one channel can be blocked by the protection system when anomalies are detected.

Before you bring your device to the service center, you need to do a series of diagnostic procedures that bring it back to life in 80% of cases. Don't panic and consider the earphone finally out of order. In this guide, we will discuss all possible causes of malfunction in detail and provide a step-by-step algorithm for restoring the health of your device.

Mechanical causes and contamination of contacts

The first and most obvious factor that affects the charging process is the physical condition of the contact areas. When you use gold or silver patches on the headphone case and inside the case, earwax, dust, pile from pockets and oxides accumulate. Even a microscopic layer of fat can create enough resistance to interrupt the supply chain.

⚠️ Warning: Never use sharp metal objects (needles, pins) to clean contacts inside the case.You may damage the spring mechanism or close contacts, which will lead to a short circuit.

For quality cleaning, it is recommended to use a cotton swab, slightly moistened in isopropyl alcohol or a special electronics cleaner. Dry cleaning is often ineffective, since greasy plaque requires a solvent. Carefully walk with a stick through the contacts on the earpiece itself and on the spring-loaded pins inside the charging case.

After treatment with alcohol, be sure to let the device dry for 5-10 minutes before installing the headphone back.

Another mechanical cause may be a loose fit of the headphone in the socket. If the magnet in the case is weakened or contaminated, the earphone may not reach the charging contacts. Check if the indicator on the case lights up when you install the earphone. If the indicator only lights up when you press your finger hard, then the problem is the geometry of the landing or contamination of the deep parts of the socket.

Deep battery discharge and its consequences

If you haven't used Xiaomi headphones for a long time and left them dead, you could have a deep discharge of the lithium polymer battery, in which the voltage on the cells drops below the threshold at which the standard charging circuit is able to recognize the device and start the current supply. The power controller goes into protective mode and blocks charging to prevent bloating or fire.

In such cases, the standard charging from USB-A computer port or weak wireless charging may not be enough to "swing" the battery, requiring a more powerful current source or a long wait. Sometimes the process of withdrawal from deep discharge takes from 30 minutes to several hours, and at this time the indicators may not show any signs of life.

⚠️ Warning: Do not try to charge headphones that have been left in the cold immediately after applying them to a warm room.

To resuscitate the battery after a deep discharge, put the case with headphones on a powerful wired charging.

There's a pulse charging technique: insert the headphones into the case for 1-2 minutes, then take them out and re-insert. Repeat this cycle 5-10 times. This can help raise the battery voltage to a level where the standard BMS (Battery Management System) circuit will allow a full charging current. If the indication does not appear after 2-3 hours of intensive charging, the battery cell probably degrades irreversibly.

Software failures and the need to reset settings

Sometimes the hardware is completely functional, but the headphone software is "hanging." The internal controller can mistakenly determine the charge level or connection status, blocking the power supply, in which case you need to perform a full reset to factory settings.

The reset procedure for different Xiaomi and Redmi models may be different, but the overall algorithm is usually the same: you need to place both headphones in the case, open the lid and pinch the touch areas or physical buttons on the headphone cases.

In some models, such as the Redmi AirDots 2 or Xiaomi Earbuds Basic 2, you need to remove the headphones from the case and simultaneously press the touch panels, holding them for about 20 seconds until the indicators flash red several times.

After a successful reset, you need to go to the Bluetooth settings on your smartphone, find the device in the list of previously connected devices, and select the option Forget the device or Unpair the pairing. Only then you can re-coup the headphones. This is a clear cache of connections and eliminates logical errors in the data protocol.

Diagnostics of the charging case and power source

Now, the problem is not the headphone itself, but the charger case, and the case has its own battery and control board, and if the battery is dead or the controller is defective, it can't transfer the charge to the headphones, even if it's connected to the network.

Check the case charging separately. Connect it to the cable and look at the indicator. If the case indicator doesn't light up at all, try replacing the USB cable or the power supply. Use a cable with known serviceability and power of at least 1 Amp.

It is important to check whether the case itself works with another, obviously serviceable headphone (if possible).

Also worth paying attention to the type of charger used. Power Delivery (High Power Charge) can work incorrectly with cheap controllers in budget headphone models. Try using an old 5V/1A power supply or a USB port on a computer that delivers a stable 500mA without voltage surges.

Features of Xiaomi and Redmi AirDots

Xiaomi's various wireless headphone lines have their own design features that affect charging. For example, the first-generation Redmi AirDots series often had the problem of sticking spring-loaded contacts inside the case. Over time, the spring weakened, and the contact simply didn't reach a dime on the earpiece.

More advanced models, such as the Xiaomi Mi True Wireless Earphones 2, use wireless case charging and magnetic fixation, where metal shavings or ferromagnetic dust are a frequent problem on wireless charging contacts or inside the case, which creates interference.

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For models with wireless case charging, use the original cable or certified analogue. Cheap cables may not provide the necessary power to start the charging process.

Owners of models with active noise cancellation (ANC) should take into account that their batteries discharge faster even when turned off due to the work of background processes.

Also worth mentioning are software updates. Some users have noticed that after updating the firmware through the Xiaomi Earbuds or Mi Wear app (for older models), the charging algorithm has been optimized. Check for updates for your device if it is even partially functional.

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The design of budget models often does not provide for the replacement of the battery, so careful handling and regular cleanliness of contacts is the key to a long life of the device.

When repairs or replacements are needed

If all of these methods — cleaning, resetting, long-term charging and replacing cables — have not helped, there is likely a hardware malfunction, which can be the failure of the battery itself (capacity loss, internal circuit), the break of the plume inside the earphone or the combustion of the charge controller.

Self-repair TWS-Headphones are extremely complex because of their miniature size and the adhesive connection of the cases. Opening the case almost always leads to damage, and to assemble the device back tightly and aesthetically without special equipment and skills is almost impossible.

⚠️ Warning: Trying to replace the battery yourself with a soldering iron requires high qualifications. Overheating of a lithium cell can lead to its ignition or explosion right in the hands.

If the headphones are guaranteed, the best solution is to contact an authorized Xiaomi service center.

If the warranty expires, the cost of repairing the service is often 70-80% of the price of a new device, as the entire headphone module changes. Therefore, for budget models (Redmi AirDots), it is more economical to buy a new pair than to repair the old one.

Prevention and proper operation

To extend the life of your Xiaomi wireless headphones, it is important to follow simple rules of operation: do not leave the device discharged to zero for a long time. If you plan not to use the headphones for more than a month, charge them to a level of 60-70% and remove them from the case, storing in a dry place.

Regularly wipe the contacts with dry soft cloth. After training, when the headphones are sweating, they should be wiped, as the salt solution aggressively affects the metal contacts, causing rapid corrosion.

Avoid extreme temperatures: Do not leave your headphones in your car in summer or on the balcony in winter.

Use quality charging cables. Cheap unprotected cables can have power surges that harm low-power controllers in a case. Follow these simple guidelines will allow you to enjoy quality sound for much longer.

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Regular maintenance and proper storage mode (not in a discharged state) increase the service life of TWS-earphones by 2 times.

Frequently Asked Questions (FAQ)