Smartphones series Xiaomi Mi Max became famous for their huge displays and impressive autonomy, but over time, even the most capacious battery loses its original capacity. If your phone began to quickly discharge, turn off in the cold or show the wrong percentage of charge, then it's time to think about replacing the battery. Self-repair allows you to save a significant amount and extend the life of your favorite gadget, turning it into a practically new device.
The process of disassembling this phablet has its own peculiarities due to the large dimensions of the body and the specific design of the rear cover. Unlike modern monolithic units, here the design allows you to conduct the procedure at home with a minimum set of tools and a certain amount of accuracy. The main thing is to take your time and follow the algorithm of actions clearly so as not to damage the plumes or the body itself.
Before you start, make sure you understand the risks of tampering with the internal electronics. Mistakes can damage the display, which in the Mi Max occupies most of the front panel, or short circuit. In this article, we will take a look at each step in detail, from the workplace preparation to the final calibration of the new battery so that you can perform the replacement safely and efficiently.
Diagnostics and selection of a new battery
Before you start disassembling, you should finally make sure that the problem lies in the physical wear of the chemical battery. Software failures can sometimes simulate a quick discharge, so first try to do a full reset or flashing. If after reset the phone continues to behave unstable, the body is swollen or the device turns off at 20-30% charge, then replacing the battery is the only right solution.
Choosing a new battery is a critical milestone as the market is overflowing with low-end copies.The original battery for the Xiaomi Mi Max has a capacity of 4850 mAh, and deviations in the big way are often a sign of fake. BM46, This is the case with this model, and note the presence of protective holograms and QR-authentication codes on the manufacturer's official website.
⚠️ Never buy batteries without a protective charge (BMS) Cheap analogues may not have protection against overheating and overcharging, which creates a risk of fire or explosion of the device.
When buying, you should also pay attention to the date of production of the battery. Lithium-ion batteries age even when turned off, so the battery, which has been in storage for several years, will have a reduced resource. The best option is a product released no more than 6-12 months ago, which guarantees the preservation of factory characteristics.
How to check the date of production of the battery?
Tools and workplace preparation required
To successfully replace the battery in Xiaomi Mi Max will require a specific set of tools that differ from the standard set for repairing conventional smartphones. Due to the large area of the back cover and the use of powerful glue to fix it, conventional suction cups may not cope or damage the glass.
In addition to thermal exposure, mechanical tools are needed to accurately open the case. Thin plastic mediators, a suction cup with a metal ring and a set of precision screwdrivers are a base that you can not do without. Metal tools such as blades or needles, it is better not to use in the initial stages, as there is a high risk of damage to the plume of the fingerprint scanner or antenna modules.
- 🔧 Thermophen or heating platform for softening glue.
- 📱 Suction and a set of plastic blades (mediators) of different thickness.
- 🪛 A set of screwdrivers with a cross slit (PH000, PH00) charge-pen.
- 🧤 Antistatic gloves and tweezers with dielectric linings.
- 🧴 Special glue B-7000 or double-sided scotch for assembly.
The organization of the workspace is no less important than the presence of tools. The surface should be clean, well-lit and, preferably, have a magnetic mat or organizer for screws. The screws in Xiaomi Mi Max can have different lengths and threads, and if you confuse their places during assembly, you can damage the thread in the plastic or break the board with a long screw.
☑️ Preparation for repairs
The process of disassembling the body and dismantling components
The beginning of work is always the same: the device must be completely turned off and removed tray SIM-Then we turn on the thermophene and start warming the perimeter of the back cover. 80-90 Celsius, so you don't damage the back of the display matrix. 2-3 minutes, periodically checking the softening of the glue with a thin mediator.
Once the glue has given in, gently insert the suction cup at the bottom of the lid, closer to the charging socket, and create a small gap. Insert a plastic mediator into the gap, and without removing it, swipe the entire perimeter of the device, gradually peeling off the lid. Move slowly, feeling resistance, and reheat the places where the lid does not move, so as not to break the plastic.
When you remove the back cover, you'll see the internal layout, where the first thing you need to do is turn off the fingerprint scanner plume if it's attached to the lid. Then you'll unscrew all the visible screws that lock the plastic frame that covers the motherboard. In the Mi Max, this frame can also be glued, so sometimes you need to warm up easily. Once you remove the frame, you'll have access to the main display plume and the battery connector.
⚠️ Warning: When unscrewing the screws of the metal frame, be extremely careful. One wrong movement of the screwdriver can lead to a breakdown of the battery or damage to the display plume, which will make the repair economically inefficient.
The next step is to turn off the plumes, and the battery connector is disconnected first, so you can completely turn off the device, and then you can turn off the display and touchscreen plumes, and then you can use a plastic blade or nail, and you can put the connector up from the bottom up, and you can't use metal tweezers here, because it can close the contacts on the board.
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Before disconnecting the plumes, take a picture of the location of all the screws and their length, which will help avoid confusion when building, especially if you do not have a magnetic map to sort the fasteners.
Removing the old battery and installing a new one
In the Xiaomi Mi Max, the battery is located at the bottom of the body and is often attached to double-sided tape or glue. To extract it, you can not pull wires or use sharp metal objects that can pierce the cell shell. There is a risk of lithium burning when in contact with air, so act as carefully as possible.
The best way to extract it is to use a thin line, a dental floss, or a special flexible plastic card, and you can thread it under the end of the battery on one side, and as you do the sawing movements, you can gradually cut the glue off over the entire area of the cell, and if the battery is swelling, you need to do this with great care so that you don't damage the shell of the swelled cell.
| Work phase | Action. | Important nuances |
|---|---|---|
| Preparation | De-energizing fees | First disable the battery plume, then the display |
| Extraction | Cutting glue | Use a thread or plastic card, heat no more than 60 ° C |
| Cleanup | Removal of glue residue | Wash with alcohol without leaving the villi |
| Installation | Fixing the new element | Apply new B-7000 glue or scotch, press for 5-10 minutes |
Once the old battery is removed, you need to thoroughly clean the seat of the residue of the old glue. Use a soft cloth soaked in isopropyl alcohol to degrease the surface. At the bottom of the case, apply a new B-7000 glue layer or stick strips of double-sided tape. Set up the new battery, press it tightly and let the glue grip for 5-10 minutes before connecting the plume.
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The key to replacing the battery is never to plug the new battery plume until it is locked in the case, and any movement can cause the contacts to detach and the power controller to fail.
Assembly of the device and check of performance
After installing the new battery and connecting it, don't rush to close the case right away. The first thing you need to do is check the device's open-ended performance. Press the power button and make sure the smartphone reacts, the Mi logo appears on the screen, and the system starts to boot. If the screen catches fire but there's no image, check the density of the adhesive of the display plume.
If the phone is successfully turned on, check the display of the percentage of charge. It should be adequate (not 1% or 100% immediately if the battery was not charged), and it is worth running a touchscreen test, swiping your finger over the entire screen area to make sure that the digitizer’s plume was not compressed during the assembly. Make sure that the speakers and microphone are working, since their modules are in close proximity to the work area.
- 🔋 Check the stress stability under load (start the heavy app).
- 🖥️ Make sure there are no artifacts on the display and dead touch screen zones.
- 🔊 Test the sound through the speaker and the speaker.
- 📶 Check the operation of communication modules (Wi-Fi, Bluetooth, cellular network).
Only after successful testing of all the features can you start the final assembly. Put all the plumes exactly in your channels so that they are not clamped with a frame. Press the plastic frame of the motherboard, twist all the screws into the appropriate holes. The back cover also needs to be warmed up around the perimeter and apply a fresh layer of glue to ensure tightness and density of the fit.
Calibration and Frequently Asked Questions
After replacing the battery in Xiaomi Mi Max, it is recommended to conduct a calibration procedure so that the power controller correctly displays the charge level. To do this, completely discharge the phone before automatically turning off, then put it on charge when turned off to 100%. After reaching full charge, keep it charging for another 1-2 hours. This procedure is useful to repeat 2-3 cycles.
Many users are wondering if replacing the battery affects warranty and water resistance. It is worth noting that any opening of the case violates factory sealing, so you should not rely on moisture protection after repair. Also, if the screws have preserved seals, their violation automatically removes the device from warranty service in authorized centers.
Why does the phone not turn on after the battery is replaced?
Should I use my phone after replacing the battery?
How long does it take to replace the battery?
Can I use a larger battery capacity?
Replacing the battery in Xiaomi Mi Max is a realistic task for a home craftsman, requiring only care and the right tools. By following the safety precautions and sequence described in this guide, you can return your device to its former autonomy. Remember that a quality battery and accuracy of execution are the key to a long and stable operation of your smartphone.