Smartphone Xiaomi Mi 5s Plus, released in 2016, still remains in service with many users thanks to its high-quality metal body and efficient at the time processor Snapdragon 821. However, time does not spare lithium-polymer batteries, and after a few years of active use, battery capacity inevitably drops. The device begins to quickly discharge, spontaneously turn off in the cold or under load, and also to charge for a long time. If you are faced with such symptoms, replacing the battery will be the only effective solution to prolong the life of the gadget.
The Mi 5s Plus recovery process requires precision and understanding of the design of the device. Unlike today’s glass-backed models, this smartphone has a Unibody all-metal non-removable body, which makes it difficult to access the internal components. You will have to dismantle the display module to get to the battery, since the rear panel is not removed separately. This increases the risk of screen damage, so it is important to strictly follow the sequence of actions and use a quality tool.
In this article, we will take a look at all the steps of replacement, from the preparation of the workplace to the final calibration of the new battery. You will learn how to safely unzip the screen, which plumes require special care and how to properly install a new battery. Safety when working with lithium batteries is critical, since damage to the battery shell can lead to fire. We will also look at the typical mistakes that beginners make and how to avoid them.
Tool preparation and selection of components
For the Xiaomi Mi 5s Plus, a standard unscrew-and-open set will not be enough because of the complex disassembly. You will need a dryer to soften the glue, suction cups to lift the display, a set of screwdrivers (cross and flat), plastic blades (mediators) and tweezers. It will also be useful to have isopropyl alcohol on hand to clean the surfaces and a new glue B-7000 or similar sealant for the final assembly.
Special attention should be paid to the choice of the battery itself. The market is oversaturated with fakes that can not only quickly fail, but also damage the phone's power controller. The original battery for the Mi 5s Plus is marked BM37 and has a capacity of 3800 mAh. When buying, pay attention to the presence of holograms, the quality of the fonts on the battery case and the voltage, which should be 3.85V. Cheap analogues often have a real capacity of half the declared.
⚠️ Attention, never use a ballooned battery, if an old battery is inflated, it puts pressure on the display and can damage it from the inside, and you should remove it with the utmost care, trying not to puncture the shell.
For comfortable work, it is also recommended to use an antistatic mat or just a clean, dry surface of the table with good lighting. Small screws are better folded into a magnetic tray or cells, marking the dismantling stages, since the Mi 5s Plus uses screws of different lengths. When you mix them up, you can damage the thread or break the motherboard with a too long screw.
- 🛠️ Precision screwdriver set (PH000, PH00, P2)
- 🔥 Dryer or heat pack for heating glue
- 🧲 Magnetic card for sorting screws
- 💳 Plastic card or mediator for snapping plumes
- 🧴 Clay. B-7000 and syringe
Dismantling process of the display module
The riskiest step of replacing is removing the display. 5s Plus has no removable back cover, the filling is only accessed through the screen. SIM-maps to depressurize the case and facilitate air output when heated. Then turn on the hair dryer and evenly warm the screen perimeter during the heating. 2-3 minutes, holding the instrument at a distance 3-4 Do not overheat one point so as not to damage the matrix or adhesive base.
Once warmed up, place the suction cup at the bottom of the screen, closer to the Home button, and gently pull up to create a small gap. Insert a thin plastic blade or a special blade into the resulting gap. Lead the tool along the perimeter, cutting the glue layer. Move slowly, without sharp jerks, constantly warming the cooling areas with a hairdryer. It is important not to insert the blade too deep, so as not to damage the internal plumes located at the edges.
When the screen is completely separated from the frame, don't try to remove it immediately. It's connected to the motherboard with multiple plumes. Turn the phone over and remove the metal protective plate that covers the connectors. It's usually screwed with several screws. After removing the protection, be sure to turn off the battery plume first to turn off the device and avoid short circuits when the other modules are disconnected.
☑️ Checking before removing the display
Only after the power is turned off can the plumes of the display and touchscreen be gently disconnected, use a plastic shoulder blade or nail, avoiding metal tools that can damage the contacts, and now the screen module can be completely set aside to a safe place with the screen upwards so as not to scratch the matrix.
Removal of the old battery
After removing the screen, you will see the inside of the smartphone. 5s Plus is attached to double-sided tape and is further fixed by a metal plate or frame, which is also glued. NFC-module and wireless charging (depending on the regional version), which requires additional attention when disassembling.
Removing the battery will require heating again. Carefully warm up the battery area through the open space, trying not to direct hot air directly to the battery for more than a few seconds. Lithium polymer cells are sensitive to temperatures above 60-70 degrees. Push a plastic blade from one angle and, sliding from side to side, gradually separate it from the body. If the battery sits very tight, you can use a thin line or a special string, passing it under the battery and moving it with sawing movements.
⚠️ Attention! It is strictly forbidden to use metal tools (knife, screwdriver) to smack the battery.
Once the old battery is removed, you need to thoroughly clean the seat of the old glue residue. Use isopropyl alcohol and a plastic card. The surface should be perfectly clean and defat-free for the new element to be firmly fixed. Also check the contact area on the phone body - it should be clean and oxidized.
It is important to check the connector of the new battery. Sometimes the contacts will have a factory protective film that must be removed before installation. Make sure that the battery connector matches the connector on the Xiaomi Mi 5s Plus board in terms of the location of the contacts and shape. Using incompatible models can lead to improper operation of the charge controller.
Installation of a new battery and assembly of the device
Before installing a new battery, it is recommended to apply a new layer of glue to the body. You can use a special adhesive layer (sold with batteries) or a liquid adhesive B-7000. When using liquid glue, apply a thin strip along the perimeter of the seat, avoiding getting glue into the center where the controls are located. Let the glue dry a little (1-2 minutes) so that it becomes less fluid.
Install the new battery in the case, combining the connector with the connector on the board. Do not press the battery immediately hard, first gently connect the plume. After connecting, check if the phone responds to charging (should light up the indicator or appear on the screen if you temporarily plug the display). If everything works, gently press the battery to the case throughout the area for fixation.
| Parameter | Original | Quality copy | Cheap forgery |
|---|---|---|---|
| Capacity | 3800mAh | 3600-3800 mAh | 2000-2500 mAh |
| Tension. | 3.85V | 3.85V | 3.7V - 3.8V |
| Weight. | ~65-70g | ~60-65g | Less than 55g |
| Marking | BM37 | BM37 | BM37 (often erased) |
Now you can start to reverse assemble. Connect the display and touchscreen plumes, make sure that the characteristic lock click. Put the metal plate in place and twist all the screws. Before the final glue of the screen, it is recommended to check the health of the phone: make a test call, check the touch screen in all areas, make sure that there are no dead zones.
Put new glue around the perimeter of the frame of the case. Spread it evenly and connect the screen to the body. Press tightly around the perimeter. For better fixation, you can use stationery gums, stretch them across and along the smartphone, and leave them to dry for 2-3 hours. Don't turn the phone on immediately, let the glue grab.
What if the phone doesn’t turn on after assembly?
Calibration and initial setting
After successful battery replacement and device assembly, a calibration procedure is needed to help Android correctly determine the percentage of charge and avoid the situation where the phone turns off at 20-30% or shows 100% immediately after charging. For the Mi 5s Plus with a MIU shell, this is especially important, since the system can “remember” the parameters of an old worn-out battery.
Calibration is simple, but it takes time. Completely discharge the phone before you turn it off. Then set it on charge when it's off and wait 100 percent. Once you reach full charge, don't disconnect the phone for another 1-2 hours. Then turn it on without being off the charger, and make sure the indicator is 100 percent. After that, you can use the phone normally until it's fully discharged.
- 🔋 Discharge the phone to 0% (automatic shutdown)
- ⚡ Charge to 100% in the off state
- ⏳ Keep it on the charger for more. 1-2 half-hour
- 🔄 Repeat the cycle 1-2 time-in-time
In some cases, it may be necessary to reset battery statistics through an engineering menu or special applications, but for most users, the method described above is enough.
Typical errors and troubleshooting
When you repair yourself Xiaomi Mi 5s Plus users often face a number of problems. One of the most common is damage to the plume of the touchscreen or display when you sloppy open. If after assembly the screen is working, but the touchscreen does not respond or does not work correctly, check the density of the connector. If this did not help, it may be that the plume was squeezed or torn.
Another common mistake is using too much glue. Excess B-7000 glue can squeeze out into the case and get on the camera, speaker or even motherboard, which will break these nodes.
⚠️ If after the battery change, the phone warms up in the camera or processor area even in a simple one, turn off the device immediately.
If the phone can't see SIM-map after assembly, check if the plume of the antenna module, which is often located next to the battery, has been displaced or damaged. SIM-cards inserted before clicking and correctly oriented.
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Use a magnetic mat for screws. The screws in the Xiaomi Mi 5s Plus come in different lengths and threads. If you confuse the motherboard mounting screws, you can break through the tracks on the board or damage the body.
Frequently Asked Questions (FAQ)
How long does it take to replace the battery with Xiaomi Mi 5s Plus?
Can I replace the battery without removing the screen?
Why does the phone say "Unknown battery" or not charge?
Do I need to reset my phone to factory settings after replacement?
Where to find the original BM37 battery?
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A high-quality battery replacement can return the Xiaomi Mi 5s Plus to a second life, making its autonomy comparable to new budget models, provided that the original components are used.