The need to open the charger case for Xiaomi AirDots Pro 2 (also known as Mi True Wireless Earphones 2) often occurs when the device stops holding charge or stops charging the headphones themselves. Inside the compact case, a lithium polymer battery is hidden, whose life is limited by the number of recharge cycles. Over time, the capacity drops, and the case ceases to perform its main function.
The disassembly process requires extreme caution, as the manufacturer uses adhesives to protect against moisture and dust. A careless opening can damage the internal plumes or rupture the body, making further operation impossible. It is important to understand that any self-manipulation automatically deprives you of the right to warranty service.
In this guide, we will take a detailed look at the steps of dismantling, the necessary tools and the typical mistakes that beginners make when working with small electronics, the right approach will allow you to replace the battery or fix a mechanical defect without serious consequences.
Preparation of the workplace and tools
Before work begins, you need to organize a comfortable space with good lighting. Small details are easily lost, so the surface of the table should be clean, flat and preferably light, so as not to lose screws or tiny structural elements.
To successfully disassemble, you'll need a specialized toolkit, and using inappropriate items like kitchen knives or thick screwdrivers can significantly increase the risk of plastic damage, and you'll need to pay special attention to adhesive joint tools.
Here is a basic list of what should be at hand:
- 🔧 Thin cross screwdriver (size) PH00 or PH000) screw-up.
- 🧤 Plastic mediators or suction cups for neat peeling off of covers without scratches.
- 🌡️ A dryer or thermostole for softening the glue (temperature no more than) 80-90 degree).
- 🩹 Tweezers with curved ends for extracting small details and plumes.
It is also recommended to have on hand isopropyl alcohol or a special solvent of adhesive, which will help dissolve the fixing composition without damaging the plastic elements of the case, and work better in a well-ventilated room.
☑️ Ready to disassemble
Design and access points analysis
The Xiaomi AirDots Pro 2 is a sandwich, where the two halves are held together around the perimeter, and unlike the older models, there are no visible screws on the outside, which creates the illusion of monolithicity. All the fasteners are hidden under decorative plugs or layers of glue.
The challenge is that the indicator plume and the contact group pass through a narrow gap between the halves of the housing, and if you open it, you can break the slim conductors that transmit the charging signal, and you need to look at the location of the internal components before you use force.
⚠️ Warning: Don't try to lid the strap hinge. This is where the most sensitive mounting elements are located, and the plastic is the thinnest, leading to chipping.
Look at the bottom of the case. This is often where the USB Type-C port and the main control board are located. The insides are usually accessed through the bottom or side face opposite the loop. Heating the case with a hairdryer for 1-2 minutes will make it much easier to separate parts.
Why is the case glued?
The process of opening the case case case case
Start heating the case perimeter, paying special attention to the angles. The glue should become elastic. After warming up, insert a thin plastic mediator into the junction between the top and bottom halves. The movements should be progressive, without sharp jerks.
Move along the perimeter, gradually increasing the gap. If you feel strong resistance, stop and warm up again. Trying to turn the tool can lead to deep scratches or cracks on the glossy surface.
After the separation of one of the sides, you will see the internal layout:
- 🔋 Lithium polymer battery glued to one of the halves.
- 💾 Principal circuit board (PCB) charge-controller.
- 🔌 Trains connecting indicators and contact areas for headphones.
Carefully bend the halves, but don't separate them completely until you disconnect the plumes. Often the board is fixed to screws that only become visible after the outer lid is removed. Use tweezers to work with miniature connectors.
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Heat the case evenly from all sides to avoid deformation of the plastic. Local overheating can lead to bubbles on the glossy coating of the case.
Battery replacement and diagnostics
The most common cause of disassembly is battery failure. Xiaomi AirDots Pro 2 uses a battery with a voltage of 3.7V or 3.85V. When replacing, it is important to choose a member of the same capacity and, critically, dimensions. Even a millimeter of difference can not allow to close the case.
The old battery is usually glued to double-sided tape. To remove it, carefully tuck the edge of the battery with a plastic blade. Under no circumstances use metal objects that can puncture the battery shell and cause a fire.
Compare the parameters of the new and old battery:
| Parameter | Standard value | Permissible deviation |
|---|---|---|
| Tension. | 3.7V - 3.85V | Not more than 0.1V |
| Capacity | 300-400 mAh | Minimum 280 mAh |
| Thickness | 3.0 - 4.0 mm | Strictly niche sized |
Once the new element is installed, you need to check the polarity of the connection. The entangled contacts can instantly disable the charge controller. If you change the battery because the case is not charging, check the state of the USB Type-C port for oxidation.
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The main difficulty of replacing is to find a battery of the correct thickness, since even a small thickening will not allow you to close the lid without damaging the plume.
Assembly and sealing of the device
The assembly is done in reverse order. Before connecting the halves, make sure that all the plumes are packed into their channels and not clamped. Any extra pressure on the wires can cause them to break during operation.
Use a special adhesive B-7000 or T-7000 to fix the body, which remains elastic after drying, allowing you to reopen the device if necessary, and apply a thin strip of glue around the perimeter, avoiding getting inside the contacts.
Procedure for gluing:
- 🧹 Degrease glued surfaces with alcohol for better adhesion.
- 💧 Apply a thin layer of glue along the contour of the lower part.
- 🤲 Put the halves together and hold them tightly together.
- ⏳ Set the case with a rubber band or clip on 2-4 half-hour.
Excess glue that has come out can be gently removed with a toothpick or finger until the compound is frozen. Once dried, it is easily removed with film. Complete polymerization of the glue takes about 24 hours, so don't rush to connect the charging immediately.
Typical errors and precautions
When self-repairing, enthusiasts often neglect safety or underestimate the fragility of components. One of the most common mistakes is to use superglue (cyanacrylate) instead of an elastic sealant, which becomes brittle and can crumble, and its vapors can settle on contacts and cause corrosion.
Another problem is that the plume of the indicator is damaged, and it's very thin, and it runs right next to the edge of the housing, and if you open it in a sloppy way, it's easy to break, and if it does, the indicator will stop burning, although charging can go.
⚠️ Attention: When working with lithium batteries, avoid puncture. Damage to the shell can cause the electrolyte to ignite. If the battery is swelling, dispose of it properly without throwing it into household trash.
Static electricity is also worth remembering: in winter or in dry rooms, the charge on the body can reach thousands of volts, which is deadly for chips, it is advisable to use an antistatic bracelet or periodically touch a grounded metal object before touching the board.