The Xiaomi Mi 5, released a few years ago, is still in service with many users due to its compact design and high-quality assembly. However, time does not spare lithium polymer cells, and over time, even the most reliable device begins to quickly discharge or turn off in the cold.
The replacement process is not trivial, as the design of the 2016 flagship involves a tight layout and the use of adhesives to fix the lid.You will need patience, accuracy and a set of specialized tools. Mistakes in the dismantling phase can lead to damage to the plumes or break the glass back, so it is important to strictly follow the algorithm of actions.
In this article, we will take a look at every step of the way, from the workplace to the final calibration of the new battery, how to safely disable the plumes, how to unplug the back cover, and how to check the tightness of the assembly. Properly performed procedure will return your gadget autonomy comparable to factory performance.
Diagnosis and selection of components
Before you start disassembling, you need to make sure that the problem lies in the wear of the battery chemistry, not in software failure or malfunction of the power controller. If the phone turns off at 20-30% charge, the body is swollen or the device is warming even in a simple one, then replacement is inevitable. Visual inspection often shows bloating, which can even lift the back cover or display.
When choosing a new battery for the Xiaomi Mi 5, it is critical to pay attention to the marking and capacity.The original model has a capacity of 3000 mAh and is designated by the code BM32.The market is full of cheap counterparts that can not only quickly degrade, but also damage the motherboard due to the lack of quality protection board.
- 🔋 Original - provides the declared autonomy and correctly displays the percentage of charge in the system MIUI.
- ⚠️ Quality copy – can have a capacity just below the original, but is safe to use if you have certificates.
- 💀 Cheap Chinese equivalent – often has real capacity 1500-2000 mAch instead of the declared 3000+ and the risk of swelling in a month.
⚠️ Never buy batteries without protective film on contacts and holograms. QR-Cheap items may not have a built-in overcharging controller.
It is also worth checking the connector on the motherboard, if the contacts are oxidized or have signs of corrosion, a simple battery replacement will not solve the problem, in which case it may be necessary to clean the board with ultrasound or replace the connector, which is already more difficult repair.
Tools and training required
If you want to do a power replacement operation successfully, you'll need a specific set of tools, because a regular screwdriver won't help. The Mi 5 design uses glue to fix the back cover, so the first step is always to heat the case. Without warming up, opening the phone will cause the glass to break.
Prepare the workspace: it should be well lit and the surface should be clean and non-conductive (for example, a silicone mat). Metal tables should be covered with a dielectric to prevent accidental short circuit of components with static electricity.
Collect the following set of tools before starting work:
- 🔥 Hair dryer or heat heater - to soften the adhesive base under the cover.
- 🛠️ Torx screwdriver set (T5, T6) — screw-off.
- 🎴 Plastic blades and mediators - for safe snapping clips and covers.
- 🧲 Magnetic mat or organizer – to avoid losing tiny screws of different sizes.
Special attention should be paid to the suction cup, which is necessary to create an initial gap between the frame and the back cover. If there is no suction cup, you can use a thin metal spatula, but you need to be extremely careful not to damage the plume of the fingerprint scanner, which runs close to the edge.
| Tool. | Appointment | Importance |
|---|---|---|
| thermophen | Warming up the glue | Critically important |
| Plastic blade | Autopsy of the hull | Tall. |
| dielectric tweezers | Battery extraction | Medium |
| Glue B-7000 | Fixing the lid | I'll be sure. |
☑️ Ready for repair
Rear cover removal process
The riskiest step of replacing the battery on the Xiaomi Mi 5 is to remove the glass back. The glass is brittle, and the glue that's glued to it will polymerize over time and become very durable. Start by turning the device off and extracting it. SIM-tray.
Keep the perimeter of the back cover warm with a hair dryer evenly for 2-3 minutes. Do not hold the jet of hot air at one point for too long to not overheat the display matrix or the battery itself. The heating temperature should not exceed 90-100 degrees Celsius. Periodically check the heating with your finger - the glass should be hot, but not burning.
⚠️ Warning: If you feel the glass is beginning to deform or rainbow spots appear on the screen, stop heating immediately.
After warming up, place a suction cup at the bottom of the lid, closer to the center, and gently pull up to create a gap. Insert a plastic blade or a thin mediator into the resulting slit. Do not use metal objects, as they can break the glass or damage the internal components.
Drive the blade around the perimeter of the device, gradually cutting through the adhesive layer. Be especially careful in the top, where the fingerprint scanner is located. Its plume can be glued to the lid, and a sharp jerking motion can break the contact. disconnect the scanner plume from the motherboard, if the design allows, or just be as delicate as possible.
What to do if the lid is not removed?
Removing the old battery and installing a new one
When you take the back cover off, you'll see the inside of the smartphone. The battery in the Xiaomi Mi 5 takes up most of the space and is usually also attached to double-sided tape. The first thing you need to do is to disconnect the battery plume from the motherboard, and you need to do this carefully, putting on the connector with a plastic blade or nail, but not pulling on the wires.
Use a plastic card or a special spatula to remove the battery, slid it from the bottom and slowly loosen it from side to side. If the battery is swelling, be very careful: a puncture or severe deformation can cause lithium to ignite, in such cases, it is recommended to pre-discharge the device to zero, if possible.
Clean the battery bed of the residues of old glue. The surface should be smooth and clean for the new cell to be securely fixed. Apply a thin layer of special glue or use ready-made adhesive strips, which often come complete with quality batteries.
Install the new battery, making sure that the contact group matches the connector on the board. Do not insert the connector at an angle - this can break the contacts. Carefully press the plume until the characteristic click. Before installing the lid, it is advisable to conduct an initial check: connect the charging plume and make sure that the phone responds to the connection.
💡
To facilitate the removal of the old battery, you can use a drop of isopropyl alcohol under the edge of the battery, but act quickly and do not allow liquid to enter the electronics.
Device assembly and sealing
The final step is to assemble and retrieve the body, and even if you don't plan on putting the phone in water, the glue has an important function: it keeps the lid on and prevents dust and moisture from getting inside, and without the glue, the structure will luft and creak.
Apply the B-7000 glue or analog with a thin continuous line along the perimeter of the frame. Avoid getting glue onto the camera, speaker and connectors. Let the glue dry a little (2-3 minutes) to a sticky film state, then gently apply the back cover.
You can press the lid tightly around the perimeter, and you can use a cage band to get better at fixing it, wrapping it around your phone. 15-20 Remove excess glue that has protruded outside until it has frozen using dry cloth or a lightly soaked napkin.
Once assembled, turn on the device and check all the modules: the camera, flash, fingerprint scanner and touchscreen. Sometimes after disassembly, the touchscreen may not work properly due to static voltage, in which case a full reset or just waiting will help.
💡
Quality sealing is not only water protection, but also a guarantee that the back cover will not fall off in your pocket after a week of use.
Calibration and primary charging
After installing a new battery, the Android system may not display the charge level correctly, since the power controller is not yet “accustomed” to the new capacity. To calibrate, it is recommended to completely discharge the phone before turning off, and then charge it to 100% when turned off.
After reaching 100%, hold your phone on charging for another 1-2 hours. Then turn on the device. If the indicator is less than 100%, recharge. Repeat the cycle 2-3 times. This will help the system re-identify the points of minimum and maximum charge.
In some cases, you may need to reset battery statistics through an engineering menu or ADB-For the Xiaomi Mi 5, it is usually enough to have a natural calibration during operation.The first couple of days, observe the behavior of the device: there should be no sharp percentage spikes or sudden shutdowns.