Xiaomi Redmi 4 Pro, also known as Redmi 4 Prime, has proven to be a reliable device with excellent autonomy. However, time is not spared lithium-polymer batteries, and after a few years of active use, the battery capacity is significantly reduced. The screen goes out by 20%, the phone turns off in the cold or when the camera starts - these are sure signs that the resource of the chemical element is exhausted.
Self-replacement of the battery is an economical way to bring the device back to life without overpaying in service centers. It requires care and a minimal set of tools, but it is quite possible for a person who knows how to handle small equipment, the main thing is to follow the algorithm of actions and take precautions to avoid damaging the plumes or the case.
Before you start, make sure that the problem is in the battery, not the software failure or the power controller. If the reset and calibration did not help, and bloating or rapid discharging is present, then replacement is inevitable. In this article, we will discuss in detail each step of dismantling and installing a new component.
Preparation of the workplace and necessary tools
Good repairs start with the right organization of space. You'll need a clean, well-lit surface, free of foreign objects. Small screws are easily lost, so prepare a magnetic mat or a container with cells to sort the fastener by disassembly steps.
The Xiaomi Redmi 4 Pro will require a specific set of tools, because the design of the smartphone involves the use of screws of different types. The main element of the fastener here are screws with a Torx slash that can not be twisted with a conventional cross screwdriver, and you will need plastic mediators to open the case without damage.
- 🛠️ Screwdriver Set: Phillips #00 cross and Torx star T5.
- 🧰 Plastic blade or mediator for snapping latches.
- 🌬️ A hair dryer or heating platform for softening glue.
- 🧲 Magnetic mat or organizer for screws.
⚠️ Note: Using metal tools (knives, needles) to open the case is strictly prohibited.You risk damaging the display plume or, worse, breaking the battery, causing it to ignite.
Pay special attention to the state of the battery before work, if the old battery is very swelled, you need to work with it with extreme caution, trying not to press it with tools, the billowing element can burst from mechanical impact, releasing caustic vapors of the electrolyte.
Diagnostics and selection of a new battery
The component market is full of offers, but finding a quality battery for the Redmi 4 Pro is not easy. Original batteries are labeled BM46 or BM47 (depending on the revision of the board and region), and these are the codes to look for first. Buying cheap counterparts without a brand often leads to re-disassembly after six months.
When choosing, pay attention to the capacity, which should be 4100 mAh. Understated performance or the absence of a protective board with a controller is a sign of poor quality. QR-code and clear printing of all parameters.
Comparative table of characteristics will help to orientate when buying:
| Parameter | Original | Quality copy | Cheap analogue |
|---|---|---|---|
| Capacity | 4100mAh | 3800-4000 mAh | 2500-3000 mAh |
| Protective fees | There is. | There is. | Often absent |
| Weight. | ~65g | ~60g | ~45g |
| Cycle resource | 500+ | 300-400 | 100-150 |
Be sure to check the connection connector. In some versions of Xiaomi connectors may differ in the location of the contacts, although for the Redmi 4 Pro model, the standard is a connector compatible with the Redmi Note 4X. Visual comparison of the old and new element before installation will help to avoid errors.
How to check the battery multimeter?
Rear cover removal process
Xiaomi Redmi 4 Pro design involves disassembling from the rear panel, because it is glued around the perimeter. Unlike older models with removable covers, there are no latches that can be opened with a nail.
Use a dryer at medium temperature, warming the edges of the device during 2-3 Do not hold the jet of hot air in one place for a long time, so as not to overheat the display matrix or the battery itself. 80-90 degree.
After warming up, insert the plastic mediator into the junction between the frame and the back cover in the area of the charging connector or volume button. Carefully drive the tool along the perimeter, feeling the resistance of the glue. If the cover does not respond, repeat the heating.
⚠️ Warning: Don't try to pull the lid off the camera or fingerprint scanner with force, and these are places where plumes pass under the plastic that can be easily torn by sloppy movement.
When the glue is softened, the lid is removed with a light movement, and underneath it you'll see a plastic safety panel covering the bottom of the board and the battery, and it's also attached to the screws, which you need to unscrew before you can manipulate it further.
Disassembly of the interior and disconnection of plumes
When you remove the back cover, you'll see the inside of the smartphone, and the main board is protected by a metal screen and a plastic lining, and you'll need to disassemble the lining to access the battery, twisting out all the screws you can see.
The first step is to disable the interconnect flex cable, which connects the lower board to the motherboard, which is a critical step because it shuts down the device and prevents short circuits from accidentally contacting the tools with the board.
- 🔌 Carefully tuck the plume connector with a plastic blade.
- 🔩 Unscrew the screws that attach plastic protection over the battery.
- 📱 Disconnect the fingerprint scanner plume if it is glued to the cover.
- 🧹 Remove the glue residue from the frame for a quality installation of a new cover.
And then there's the battery line. In the Redmi 4 Pro, it's glued to the middle frame with double-sided tape, and you have to be very careful about pulling the tongue, and if the battery is sitting tight, you can lightly tuck it in with a plastic card on the opposite side of the plume.
☑️ Ready to retrieve the battery
Installation of a new battery and assembly of the device
Before installing a new battery, a seat must be prepared, the old glue and residues of tape removed with alcohol or a special solvent, and the surface must be clean and defatted so that the new adhesive layer holds securely.
A new battery is usually already adhesive. If it's not there, use a quality double-sided electronics tape. Don't apply liquid glue directly to the battery, which, if replaced, will create huge problems and risk damage to the new cell.
Put the battery in a frame, press it tightly all over the surface, connect the connector plume to a characteristic click, make sure the plume is flat, not clamped, not clamped, then you can put a plastic shield and twist the screws.
When you install the back cover, also use a new adhesive layer or a special adhesive B-7000. Apply a thin strip of glue to the frame, avoiding hitting the camera and speaker. Press the cover and lock with rubber bands for 15-20 minutes.
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Use rubber rubber rubber rubber rubber bands to tightly press the back cover during drying of the glue, which will ensure that the case is tight and there are no gaps.
First start and calibration of the battery
After physical assembly, take your time to turn on the smartphone immediately. It is recommended to first put the device on charge for 15-20 minutes, which will allow the power controller to “see” the new battery and stabilize the voltage before starting the system.
When you first turn on, the phone can boot longer than usual. If the screen catches fire but it doesn't charge, check the density of the connector, you may need to open the device again and reconnect the plume.
To correctly display the percentage of charge, you need to calibrate it, completely discharge the phone before turning it off, then charge it to 100% when it's off, then you can use the device as normal, and the system will remember the real limits of the capacity.
⚠️ Warning: If after the replacement the phone shows the wrong percentage of charge or turns off on the phone 30-40%, Don't panic. It's normal for the first cycles of a new battery. 3 before 5 charge-discharge.
Watch the heating temperature during operation. The new battery should not warm much under normal load. If heating is present, there may be a software problem or a malfunction of the power controller on the board.
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High-quality battery installation extends the life of the smartphone, but only if you use original or certified components and accuracy during installation.