Modern wireless headphones Xiaomi Redmi Airdots 2 have proven to be an affordable and high-quality solution for listening to music, but over time the capacity of their lithium-polymer batteries inevitably decreases. If your headphones stopped holding charge or discharge in just 15-20 minutes of active use, this is a direct signal that the resource of the chemical element is exhausted. Many users mistakenly believe that the device with a monolithic case is not subject to repair, but practice shows that replacing the battery is quite real with minimal soldering skills.
The process of restoring autonomy requires care, because the interior space of the case and the ears themselves is extremely limited. You have to work with miniature components where the cost of error can be high. The main difficulty is to carefully open the case without damaging the plastic latches and then work with the thinnest power wires. In this material, we will discuss each step of the procedure in detail so that you can return life to your gadget.
Before starting a disassembly, it is important to prepare the workplace and make sure that the necessary tools are available. Don’t try to replace the battery on the knee or using improvised means like a paper knife, as this can damage the control board. Quality repair begins with proper preparation and understanding of the design of the Redmi Airdots 2 device.
Tools and workplace preparation required
The success of a battery replacement operation depends on the quality of the tool used. To work with microelectronics, which include wireless headphones, a regular set of screwdrivers will not work. You will need specialized tools that allow you to manipulate tiny parts without risking damage or loss.
First of all, you need to get a thin metal scalpel or a special mediator to open the cases. Plastic cards may not cope with the dense adhesive connection characteristic of Xiaomi. Also critical is a soldering iron with a thin sting, preferably with temperature adjustment, so as not to overheat the tracks on the board.
- 🛠️ Thin scalpel or blade for neat opening of the body seams.
- 🔥 A soldering iron with a thin sting and solder with flux for micro soldering.
- 🔍 Loop or microscope to monitor the quality of soldering contacts.
- 🧲 Magnetic mat for fixing small screws and parts.
Special attention should be paid to the choice of a new battery. The native battery in Redmi Airdots 2 has a specific shape and size, so finding an exact copy can take time. It is allowed to use analogues with similar dimensions, but the voltage must strictly correspond to the original, usually 3.7V. The nominal capacity must also be close to the factory for the charging system to work correctly.
⚠️ Warning: Before starting work, be sure to discharge the old battery to zero or the minimum value if possible, this will reduce the risk of short circuit and fire if accidental damage to the cell shell during dismantling.
Organize good lighting of the work area. Small details, such as contact areas on the headphone board, are poorly distinguishable in dim light, which increases the risk of error. Using a desk lamp with the ability to focus light will greatly facilitate the soldering and assembly process.
Design features of Redmi Airdots 2
Understanding the internal Xiaomi Redmi Airdots 2 is key to a successful repair, and these headphones are made in the TWS (True Wireless Stereo) form factor, which implies full autonomy for each module and the availability of a charging case. Inside each ear is a compact board, speaker, microphone and, in fact, the battery itself.
The charging case also has a battery that powers the charge of the headphones. Often users confuse the discharged case with the malfunction of the headphones themselves. If the indicators on the case do not light up when you put the headphones inside, the problem may be both the case battery and contacts. In this article, we will focus on replacing the elements in the headphones themselves, as this is the most common cause of loss of autonomy.
Distribution of elements
The Airdots 2's component attachment is done with minimal screws, and the main fixation method is a plastic case assembled on latches and adhesive sealants, which makes it moisture-proof, but makes it difficult to access the insides, and the tightness of the structure requires the use of force at the opening, but the force must be dosed.
The electrical circuitry of the headphones is simple: the battery is connected to the charge controller and Bluetooth module. When disassembling, it is important not to damage the antenna, which is often made in the form of a track on the board or soldered wire.
The process of disassembling headphones and removing the battery
The beginning of the disassembly is the most critical stage, where often breaks occur, find a seam that connects the two halves of the headphone body. In the Redmi Airdots 2, it runs along the perimeter. Carefully insert the scalpel blade into the joint and, as you make reciprocal movements, gradually move along the seam.
Don't try to unpack the body at one point, your job is to cut the adhesive layer all over the circle, and after the blade has passed a significant portion of the perimeter, you can use a thin plastic blade to finally untie the halves, and inside you'll see a board and battery filled with glue or fixed with plastic stops.
☑️ Checklist for safe disassembly
Removing the battery, which is usually glued to the inner wall of the case or board, may require heating. Use a dryer at a minimum temperature to soften the glue. The temperature should not exceed 60-70 degrees, so as not to damage the polymer shell of the battery and the board itself.
Once you've removed the element, look at how you connect it. In Xiaomi, wires are often soldered directly to the board, less often a connector is used. If the wires are soldered, you need to gently solder them off, warm the contacts with a soldering iron. Try not to pull the wires so as not to tear the contact pads off the board itself.
⚠️ Attention: It is strictly forbidden to pierce or bend an old battery at an acute angle. Damage to the internal structure of the lithium-polymer cell can cause instant ignition or a chemical reaction with the release of caustic vapors.
Installation of a new battery and soldering contacts
Preparing a new battery requires careful fitting. If you purchase a cell with wires, make sure that their length corresponds to the distance to the contact areas on the board Redmi Airdots 2. Too long wires can prevent the body from being assembled, and too short will create tension, which is unacceptable.
The soldering process should be fast. Clean the ends of the new battery wires from insulation by 1-2 mm and get them soldered, also get the contact areas on the board, where they will connect + (plus) and - (minus), Polarity is critical: the error will cause the charge controller to burn.
| Parameter | Original | Permissible analogue | Note |
|---|---|---|---|
| Tension. | 3.7V | 3.7V - 3.85V | Strictly observe the voltage |
| Capacity | 40-45 mAh | 40-60 mAh | Affects working hours |
| Jack | Pike. | Pike. | Connectors are rare |
| Type | Li-Pol | Li-Pol | Li-Ion will not fit in the shape |
Seal the wires to the board, holding the soldering iron stinger for no more than 2-3 seconds at each contact. Use tweezers to fix the wire so that it does not shake when the solder cools. After soldering, be sure to check the connection for "cold soldering" or closing neighboring contacts.
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Use active flux for soldering, it provides better spreading of solder on oxidized contacts of old boards, but requires mandatory subsequent cleaning with alcohol.
Lock the new battery in the case. This can be done with double-sided tape or a drop of special electronics glue (B-7000), the main thing is to ensure that the battery does not shift when the body is assembled and put pressure on other components.
Device assembly and initial inspection
The Xiaomi Redmi Airdots 2 is assembled in reverse order. Make sure the battery wires are in the channels reserved for them and are not clamped with halves of the body. When connecting parts of the body, first snap the main locks, and then gently press the perimeter until a characteristic click.
If the case has been opened in violation of the adhesive layer, you may need to apply a new layer of sealant to restore the moisture protection, but for everyday use, often enough dense fitting of plastic parts, let the glue dry for a few hours before the first switching on.
The primary health check is done by placing the headphones in the charging case. The indicators should light up, signaling the start of the charging process. If the indicators do not respond, the polarity of the soldering or the contact of the wire with the board may be disturbed.
Connect your headphones to your smartphone and check the charge level in your MIUI or Android system. Correct display of charge percentage and stable operation of the Bluetooth connection indicate a successful completion of the repair. The charge-discharge cycle of the new battery may require calibration: fully discharge and charge the device 2-3 times.
Typical errors and security measures
When you repair electronics yourself, it's easy to make a mistake that can be fatal to the device. One of the most common problems is that the board is overheated with a soldering iron. Prolonged exposure to high temperatures can peel off tracks or damage the Bluetooth module, after which the headphones will no longer see the phone.
Another common mistake is using the wrong glue. Cyanacrylate-based superglues can release fumes that settle on speakers and microphones, degrade the sound quality or completely disable them. For Redmi Airdots 2, use only specialized electronics adhesives or double-sided tape.
- 🚫 Do not use aggressive solvents to clean the board, they can wash away the labeling and damage the plastic.
- 🚫 Avoid static electricity, work on an antistatic mat or just on a wooden table.
- 🚫 Do not force the assembly if the body does not converge - check the stacking of wires.
⚠️ Warning: If your headphones warm up during charging or operation after battery replacement, stop using immediately, which may indicate a short circuit inside the case or a new battery failure.
Remember, self-repairing deprives you of an official warranty if it was still in effect, but for models released a few years ago, this factor is no longer relevant, and replacing the battery saves you a significant amount compared to buying a new device.
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High-quality soldering and polarity are the two main conditions for successful battery replacement, without which further operation is impossible.