Xiaomi’s current smartphones, whether they’re budget-friendly Redmis or flagship Mis, are designed to be as tight as possible and aesthetically consistent as possible. Unlike a decade ago, you won’t find a removable back cover that can replace the battery in seconds without additional tools. Manufacturers deliberately make it harder to access internal components to protect the device from moisture, dust and inexperienced user intervention.
However, the need to get to the power source is quite common: the battery may swell, lose capacity or simply stop holding charge after several years of active use. The process of removing the lithium polymer battery requires not only special tools, but also a clear understanding of the physical principles of the adhesives that fix the battery. Errors at any stage can damage the plumes, screen or, in the worst case, to ignite a damaged battery.
In this article, we will discuss in detail the algorithm of actions that will allow you to safely remove the battery from your device.We will discuss the preparation of the workplace, the choice of the right tools and the specifics of working with different models of Redmi Note and Xiaomi Mi. It is important to realize that opening the case automatically deprives you of warranty support, so weigh all the risks before starting work.
Preparation of the workplace and necessary tools
Before disassembling, you need to organize a space that meets the requirements of safety and convenience. You need a smooth, well-lit surface, preferably with an antistatic coating or ordinary clean fabric, so that small screws do not get lost and roll into inaccessible places. The absence of dust in the air is also critical, since when you open the housing, debris can enter, which will subsequently cause closure or contamination of contacts.
The toolkit should be tailored to the specific design of Xiaomi smartphones. The standard set of “homemaster” will not work here, since special screws are used, and adhesive connections require careful heating. Ignoring this rule often leads to slicing of the screw faces or damage to the frame of the device.
- 🔧 Set of screwdrivers: mandatory presence of a cross screwdriver size PH000 or PH00 for twisting the screws of the body, as well as a flat screwdriver for careful tweaking of plumes.
- 🌡️ Hair dryer or thermophen: necessary to soften the factory glue holding the back cover and the battery itself; household hair dryers often do not give the desired temperature.
- 💳 Plastic mediators: thin blades or old plastic cards are needed to separate the lid and tweak the battery without damaging the surrounding components.
- 🧲 Magnetic mat or organizer: screws in Xiaomi smartphones can be of different lengths, and confusing their installation places means the risk of breaking through the motherboard when assembly.
Special attention should be paid to the safety of the battery. Lithium polymer batteries when damaged housing (puncture) can instantly ignite or even explode, so all manipulations should be carried out away from flammable materials. It is recommended to keep a sand container or a class D fire extinguisher at hand, although for home repairs it is enough to simply follow the utmost care and not use metal tools in close proximity to the battery body.
Diagnosis of battery condition and precautions
Before you start physical impact on the housing, you need to assess the current condition of the device. If the battery is swelled, it may already put pressure on the screen or back cover, which makes them more fragile. In such cases, the heating should be used with extreme caution, as overheating of the bloated battery can cause heat discharge.
The optimal charge level for starting work is considered to be a range of 15% to 40%, a fully charged battery carries more energy and poses a higher risk when shorted, and a fully discharged one may not allow the device to be turned on for inspection after repair. Before starting work, be sure to turn off the smartphone and remove SIM-map.
⚠️ Warning: If you smell chemicals or see that the battery is severely deformed and pressing on the screen, do not try to heat the device.
It's also important to check if the battery has changed before, if the device has been repaired, it may have been fitted with an unoriginal power cell or used an inappropriate glue that behaves differently when heated. Visual examination through a magnifying glass (if there is access to the ends) can provide clues about previous interventions.
Work in a well-ventilated environment, where the adhesive bases and body plastics can heat up, and volatile substances that are not good for breathing can be released, and using a medical mask or respirator is a reasonable precaution, especially if you plan to perform these operations regularly.
Removing the back cover and accessing internals
The first step in any Xiaomi smartphone disassembly is to dismantle the back. Modern models like the Redmi Note 10 or Xiaomi Mi 11 have glass or plastic covers planted on double-sided tape around the perimeter. First, you need to unscrew all the visible screws, which are often hidden under stubs or the brand logo.
After removing the screws, you need to warm up the perimeter of the device. Use a hair dryer, evenly warming the edges for 2-3 minutes. The temperature should not exceed 80-90 degrees Celsius, so as not to damage the screen matrix, which can also suffer from overheating on the back. You can check the heating with your finger: the body should be hot, but tolerant to touch.
Then the suction cup and the mediator come in, and you attach the suction cup to the bottom of the back cover, you create tension, you put a thin plastic blade in the gap, and you have to move along the edge, and you have to slid the glue gradually, and you don't try to force the lid at one point, and you're guaranteed to crack.
☑️ Preparation for lid removal
After successfully removing the lid, you will see an internal layout, and in most Xiaomi models you will see a plastic or metal plate covering the main part of the hardware, including the battery plume and connectors, which also needs to be carefully snapped or unscrewed if it is fixed by screws.
Disabling the plume and retrieving the battery
This is the most critical stage, requiring composure: the battery in Xiaomi smartphones is connected to the motherboard through a connector, which is often located under or near the protective plate.
Use a plastic blade or nail (if convenient and safe) to snap the connector. The movement should be directed upwards, from the plane of the board. It is strictly forbidden to tamper with the connector itself with a metal screwdriver, since there is a great risk of closing contacts on the board and disabling the power controller.
Once the plume is turned off, the battery will still be attached to the body or the inner frame on adhesive basis. Manufacturers use a rather aggressive adhesive that only strengthens its properties over time.
- 🧪 Isopropyl alcohol: it must be gently introduced under the edge of the battery using a syringe or pipette to dissolve the glue.
- 🎣 Line or thin string: used to "re-saw" the adhesive layer under the battery with sawing movements.
- 🔥 Reheating: if the battery fails, you can carefully warm the area under it through the front panel (if the design allows) or behind, but very dosed.
Do not try to pick out the battery with a screwdriver from the bottom, which is almost guaranteed to cause the shell to puncture and fire. Act slowly, gradually separating the surface behind the surface. If the battery is very swelled, it can burst from the slightest pressure, so be extremely sensitive.
Specificity of models with non-removable housing and hidden screws
Some Xiaomi models, especially the protected series or wireless charging devices, have added protection. The screws can be hidden under a layer of graphite heat pad or stickers.
In devices with a glass back cover, the risk of damage when disassembled above. The glass does not bend like plastic, and when heated can burst from a thermal shock. For such models, it is recommended to use special suction cups with a lock or even vacuum heated platforms to warm up the entire area evenly.
| Xiaomi model | Type of lid attachment | Location of the plume | Difficulty of extraction |
|---|---|---|---|
| Redmi Note 8/9 | Glue + screws | Side, easy to access. | Low. |
| Xiaomi Mi 11 | Strong glue, glass | Under the central plate | Tall. |
| Poco X3 NFC | Glue + screws under the logo | Side, under the radiator. | Medium |
| Xiaomi Mi 9 | Glue, glass. | Side, access after lid removal | Medium |
It's important to remember that some flagships have a complex system of tubes and graphite layers that are also glued together, and if you take the battery off gently, you can damage the heat pads, which will overheat the processor in the future, and it's advisable to replace them with new ones when you build them.
Installation of a new battery and final assembly
Once the old cell has been successfully removed, a place must be prepared to install the new one, and the glue residues from the housing must be carefully removed using a plastic card and isopropyl alcohol, and the surface must be clean and fat-free, otherwise the new battery will not be securely fixed.
A new battery usually comes with an already applied adhesive layer, a closed protective film. Don't remove the film until the final fitting. Set the battery in the bay, check if it interferes with the plumes, and then, combining the connector, connect the plume to the motherboard before the characteristic click.
Before you stick the lid permanently, it is recommended to conduct a test turn on: connect the display plume (if it has detached), press the on button and make sure that the smartphone reacts, shows the image and, most importantly, sees charging, this will avoid re-disassembly in the event of a new battery failure.
To fix the lid, use a special electronics sealant (e.g., B-7000 or T-7000) to apply it with a thin strip along the perimeter of the frame, avoiding contact with the cameras and the speaker. After pressing the lid, it is desirable to lock the device with rubber bands for 1-2 hours until the glue is completely polymerized.
⚠️ Warning: Don't use superglue (cyanacrylate) to fix the lid or battery! it highlights the fumes that settle on the camera lenses and sensors, making them cloudy, and also makes the plastic brittle and can corrosive the contacts.