Xiaomi Mijia Quartz smartwatches have proven to be a stylish and functional accessory that combines classic design with modern technology. However, like any self-powered electronic device, they require periodic replacement of the energy source. Many users face the dilemma of whether to carry the gadget to the service center or try to replace the battery yourself. In this article, we will discuss in detail what battery is used in this model, and whether to perform the procedure at home.
A standard battery typically lasts between one and two years of active use, after which the watch quickly discharges or stops turning on. It is important to understand that timely replacement will prolong the life of the device and avoid the leakage problems that can occur with prolonged oxidation of the old cell. We will look at the technical nuances, necessary tools and step-by-step algorithm of actions for successful completion of the task.
Before you start disassembling, you need to make sure that the problem lies in the discharge, and not in the software failure or malfunction of the charge controller. If your Mijia Quartz stopped responding to the connection to the charger or show the wrong percentage of charge even after a long connection, most likely, the resource of the chemical element is exhausted, in which case replacing the battery will be the only effective solution to restore the functionality of the gadget.
Technical characteristics of the power source
At the heart of the Xiaomi Mijia Quartz watch power system is a lithium-polymer battery specifically designed for compact wearables. The main identifier of the element is a marking that indicates its physical size and chemical composition. This model most often uses an element with an LIR code or a specific form factor other than standard button batteries, which often causes confusion among beginners.
The nominal voltage of a standard battery is 3.7 Volts, which is the standard for lithium batteries. The capacity usually varies between 200-250 mAh, which ensures the manufacturer's declared autonomy. It is critical when looking for an analog to pay attention not only to voltage, but also to the overall dimensions, since even a minimal deviation in thickness can lead to the fact that the housing cover will not close or damage the display.
Below is a table with the main parameters that must be considered when choosing a replacement element:
| Parameter | Meaning | Note |
|---|---|---|
| Type of element | Li-Po (Lithium polymer) | Rechargeable |
| Nominal voltage | 3.7 V V | Permissible range 3.6-3.8 B |
| Form factor | Specific (Custom) | Often requires soldering or connector |
| Operating temperature | -10°C... +60°C | Standard for Wearable Electronics |
It is worth noting that in some modifications or revisions of the board, the manufacturer may have used elements with slightly different characteristics. Therefore, before ordering a new part, it is strongly recommended to open the device and visually inspect the marking on the old battery.
Tools and workplace preparation required
A high-quality and safe replacement of the battery in Xiaomi Mijia Quartz will require a minimum set of tools that most home craftsmen will find. However, the use of specialized equipment will significantly reduce the risk of damage to fragile components, the main tool will be a thin plastic blade or mediator that will open the case without scratches.
You'll also need a suction cup to gently pull the back cover or the screen apart, depending on the design of the watch. If the model involves soldering contacts, you need to prepare a soldering iron with a thin sting, flux and solder. Don't forget about isopropyl alcohol to degrease surfaces and remove glue residue.
- 🛠️ A set of precision screwdrivers (cross and flat)
- 🧲 Plastic blades and mediators for opening
- 🔋 New battery with appropriate characteristics
- 🧪 Isopropyl alcohol and lilac-free wipes
- 🔍 Lunch or magnifying glass for small parts
Workspace management is half the success. Choose a well-lit table with a flat surface. It is recommended to use an antistatic mat to eliminate the possibility of damage to electronics by a static discharge. Safety should be a priority, especially when working with lithium cells that are sensitive to punctures and short circuits.
⚠️ Warning: Before starting work, be sure to turn off the device. If the watch does not respond to buttons, wait until the screen goes out, or disconnect the battery plume immediately after opening the case to avoid short circuit.
The process of dismantling and replacing the element
The replacement procedure begins with a careful opening of the body. Depending on the design of the Mijia Quartz, the back cover can be held on the latches or glued. If glue is used, it is recommended to slightly warm the perimeter of the cover to a temperature of 40-50 degrees Celsius to soften the adhesive. Do not overheat the device, so as not to damage the display or internal battery.
Once the lid is removed, you will have access to the insides of the device. Find a battery that is usually located under a protective plate or attached to a double-sided tape. If the battery is connected through the connector, it must be carefully disconnected with tweezers. In the case of soldering contacts, you will need to carefully work with a soldering iron: first, the plus contact is soldered, then the minus one to avoid closing.
☑️ Checklist before ration
Install the new element in reverse order. Make sure the polarity is met: plus to plus, minus to minus. If you confuse the contacts, it can cause the power controller to fail or even fire. Once installed, check the reliability of the connection and then start assembling the case.
What to do if the new battery is not charged?
Features of sealing and assembly
Assembling the case is not just a reverse disassembly process; tightness is a key parameter for smartwatches, especially if they have the declared moisture protection. When reassembled, the old adhesive layer tends to lose its properties, so it is recommended to use a new layer of special adhesive B-7000 or T-7000, or replace the sealing gum.
Apply a thin layer of glue around the perimeter, avoiding getting into the internal components, speaker and microphone. Excess glue can harden and block the buttons or dynamic membrane. Once the parts of the case are connected, you need to fix them with rubber rings or stationery gums for 1-2 hours before drying completely.
- 🧹 Carefully clean all surfaces of dust and old glue
- 💧 Use a minimum amount of glue to keep gaps.
- ⏱️ Let the glue dry the manufacturer specified time
- ✅ Check all buttons and vibrations before final fixation
Don't ignore the button check step. If you have difficulty pressing or sticking after you assemble the power button or switch modes, the glue layer is too thick or the lid is skewed, and then you have to repeat the sealing procedure, and the build quality has a direct impact on the durability of the device in everyday wear.
⚠️ Warning: Do not test the watch's waterproofing under the tap immediately after gluing. Complete polymerization of the glue can take up to 24 hours. Early water intake can disrupt the leakage.
First launch and calibration
After the battery is successfully replaced and the housing is assembled, there comes a moment of truth, the first run. Connect the watch to the charger. The charger should light up, confirming that the circuit is assembled correctly and current is coming to the power controller. If there is no indication, recheck the battery connection.
New lithium cells often require calibration procedures, recommending that the device be completely discharged before shutting down and then charge it to 100% without interruption, which will help the battery management system (BMS) correctly determine the actual capacity and display the correct percentage of charge in the Xiaomi Wear or Mi Fitness interface.
The first charge can heat up the device, which is normal chemical process, but the temperature should not exceed 40-45 degrees Celsius. If the heat is excessive, immediately turn off the charge and check the contacts for short circuit or bad fit.
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To extend the life of a new battery, try not to discharge the watch below 15-20% and do not keep on charging longer than necessary after reaching 100%.
Possible problems and troubleshooting
Even if all the instructions are followed, there can be unexpected situations, and one of the common problems is that the device turns on but discharges quickly, which may indicate that the new battery is failing or that the old battery has simply swung and the controller is not working properly with the new capacity, in which case it may be necessary to reset the settings to the factory.
Another common mistake is that the plume is damaged by a careless opening, and if the screen is working with artifacts or the touchscreen is not responding, the display plume is likely to be affected, and the diagnosis requires re-disassembly and visual inspection of the plumes under the magnifying glass.
| Symptoms. | Probable cause | Decision |
|---|---|---|
| No reaction to charging | Connector not connected | Check the battery connection |
| The clock is warming | Short circuit. | Urgently disconnect, check the fee |
| Quick discharge. | Marriage of an element or background process | Calibrate or reset |
| Vibration's not working. | Vibrator damaged. | Replacement of vibrator |
If you are faced with a complex malfunction that cannot be eliminated on your own, it is better to contact a specialized service. Independent attempts to repair complex electronics without experience can lead to a complete loss of warranty and performance of the gadget.
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The main key to success is accuracy when working with small details and the use of high-quality components, rather than cheap analogues with questionable characteristics.