Smartphone Xiaomi Mi 5, released in 2016, has long been the benchmark of a compact flagship, but time does not spare lithium-polymer batteries. If your device began to quickly discharge, turn off at 20-30% charge or inflated, the only right solution will be a complete replacement of the power unit. Self-replacement of the battery allows you to save a significant amount and extend the life of your favorite gadget for another year or two of active use.
The replacement process is not a very complex one, but it requires carefulness, because the internal layout of the Mi 5 is quite dense. You will need a toolkit, a new quality component and a clear understanding of the sequence of actions. In this article, we will discuss each step in detail, from the preparation of the workplace to the final calibration of the system.
It is important to understand that the quality of the new battery directly affects the stability of the Snapdragon 820 processor. Cheap analogues may not give the necessary current under load, causing unexpected reboots. So before starting work, make sure that you purchase a reliable component element with a capacity of at least 2900 mAh, which is the standard for the original model.
Tools and workplace preparation
Before starting disassembly, you need to organize a safe space, working with small electronic components requires good lighting and no static electricity, it is recommended to use an antistatic mat or just work on a clean wooden surface, avoiding synthetic fabrics.
To successfully perform the procedure, you will need a specific set of tools, which is often sold as a smartphone repair kit, the main tool being a suction cup to lift the glass and a set of plastic blades (mediators) that will not scratch the case.
- 🔧 Set of screwdrivers: mandatory presence of cross PH000 and a small flat screwdriver.
- 🔥 Hair dryer or heating platform: necessary to soften the factory glue under the back cover.
- 🧲 Magnetic mat or organizer: for sorting screws of different lengths, so as not to confuse them when assembling.
- 🧴 Isopropyl alcohol and a thin line or special string: for careful separation of modules.
Note that using a metal scalpel while lifting the back cover is highly undesirable.The Xiaomi Mi 5 glass is brittle, and one awkward move can cause it to split, requiring the entire body to be replaced.
⚠️ Warning: Before starting any work, be sure to turn off the smartphone. Attempting to disconnect the battery plume when the device is on can lead to a short circuit and failure of the power controller on the motherboard.
Diagnostics and selection of a new battery
Choosing the right components is half the success of a repair. The market is full of copies that look like the original, but have cheap cells of poor quality inside. For the Xiaomi Mi 5, it is critical to choose a battery with the correct labeling and protective board.
The original model is labeled BM22. When buying, pay attention to the availability of holograms, the quality of the type print and the weight of the element. The original battery weighs about 50-55 grams, whereas cheap fakes are often lighter due to the use of less dense materials.
| Parameter | Original BM22 | Quality copy | Cheap forgery |
|---|---|---|---|
| Capacity | 2900 mAh | 2800-2900 mAh | 1500-2000 mAh |
| Tension. | 3.85V | 3.85V | 3.7V - 3.8V |
| Weight. | ~52g | ~48-50g | ~35-40g |
| schleife | Flexible, chip-wielding. | Hardened | Very tough. |
If you plan to use your smartphone in intensive navigation or gaming, you don't need to save on the battery. A weak recoil current will cause the phone to "suck" the voltage when you run heavy applications, which the system perceives as a discharge and turns off the device.
Disassembly of the hull and removal of the back cover
The most difficult step for many users is opening the body without damage. The Mi 5's rear panel is glued around the perimeter to double-sided tape, which hardens over time. Heat is a key factor in success at this stage.
Turn on the dryer at the average temperature and warm the perimeter of the back cover evenly for 2-3 minutes.Do not hold the hair dryer at one point for too long so as not to overheat the display matrix or the battery itself if it is swollen.The glass should become warm, but not hot for the hands.
Once warmed up, place a suction cup at the bottom of the back cover, closer to the Home button, and pull up slightly to create a gap. Insert a plastic mediator into the gap, gently, and drive it along the edges, cutting the glue layer. The movements should be sliding, not stabbing.
- 🔥 Heat the body gradually by checking the temperature with your hand so as not to damage the internal components.
- 🛠 Enter the blade at an angle of no more than 15 degrees to the plane of the body to avoid breaking the glass.
- 🧩 Move in a circle, starting from the bottom, then the side faces, and only at the very end - the upper part of the camera.
⚠️ Attention: At the top of the smartphone, next to the lens of the main camera, the adhesive layer is special. Do not put excessive effort in this area, so as not to damage the flash plume or the camera module.
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If you don’t have a hair dryer on hand, you can use a powerful table lamp by pointing it at the back cover at a distance of 10-15 cm for 5-7 minutes, but this is less effective.
Dismantling protective screens and disconnecting plumes
Once the back cover is successfully removed, you will see the inside of the smartphone, but you can't immediately remove the battery, because it's covered by a metal shield that's screwed and attached to the plumes.
The first thing you need to do is unscrew all the visible screws on the metal screens that cover the connectors. The Xiaomi Mi 5 uses a system of screws of different lengths. It's critical to remember or record which screw was twisted from where. A long screw screw screw screwed into a short hole can break the circuit board and put the phone out of action forever.
Carefully remove the metal plates. Underneath them, you'll see the connectors of the display plumes, the touchscreen and, most importantly, the battery pack. Use a plastic blade or nail to shut down. You'd better not touch the contacts on the board with metal tools.
Sequence of disconnection:
1. Battery connector (always the first!)
2. Display connector
3. Touchscreen connector (if required)Once the main power plume is turned off, you can consider the device to be de-energized, then you unscrew the frame that holds the battery itself, in some versions it is held on adhesive basis, in others on perimeter screws.
☑️ Check before removing the battery
Removing the old battery and installing a new one
The old battery in the Mi 5 is often glued quite firmly, so if you're planning on saving it for recycling or just gently removing it, use a thin line or a special string. Stretch it under the battery and cut the adhesive layer with sawing movements.
Do not attempt to swell the battery with a screwdriver or knife. A puncture of a lithium polymer cell will cause an instant chemical reaction, emitting smoke and fire. If the battery is swelling, act with extreme caution, as its shell is thinned.
The new battery before installation, it is advisable to clean the factory film (if it is on the contacts) and check visually for no defects. Insert the battery into the seat, making sure that it lies flat and does not bulge above the level of the frame.
- 🧹 Degrease the seat with alcohol for better adhesion of new glue.
- 🔋 Connect the new battery plume before installing protective plates to check operability.
- 🧪 Click on the battery throughout the area for a tight fit to the case.
After the physical installation, plug the plume into the motherboard before the characteristic click. Make sure the connector lock (if any) is closed. Now you can check the device without sticking the back cover. Press the switch on.
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Successful turn on the phone and display the correct percentage of charge immediately after connecting is the main sign of the correct installation and serviceability of the new battery.
Device assembly and battery calibration
If the phone is on and showing charging, you can start the final assembly. Put all the metal screens in place, twist the screws according to their length. Make sure that no plume is clamped or bent.
To fix the back cover, use a special glue B-7000 or E-8000, or ready-made adhesive frames for the Xiaomi Mi 5. Apply a thin layer of glue on the end of the body, apply the lid and press tightly around the perimeter. Lock the device with money bands for 15-20 minutes before the initial grasp.
Once assembled, you need a calibration procedure to ensure that the power controller correctly displays the charge level. Completely discharge the phone before turning off, then charge it when off to 100%. Then turn on the phone and, if the rate is less than 100%, continue charging.