Xiaomi Redmi 4 is deservedly considered one of the most reliable devices in the budget segment, but time does not spare even the highest quality components. Over time, the lithium-ion battery loses its capacity, which leads to rapid discharge, unexpected shutdowns in the cold or bloating. If your device stopped holding the charge during the working day, I came to think about replacing the battery.
The power supply replacement process on this model has its own characteristics, which distinguish it from more modern smartphones with non-shatterable cases. Owners need to consider the design of the device, where the back cover is a non-removable part of the frame, and access to the insides is only through the display module, this requires accuracy and the presence of a specific set of tools.
Before you start disassembling, it is important to assess your skills and risks. Mishandling can damage plumes, break the screen or, in the worst case, fire a damaged battery. This article will help you understand the nuances of the procedure, choose the right tools and safely perform the replacement, returning the phone to a second life.
Quality repairs start with the right organization of the space. You'll need a clean, well-lit table, preferably with an antistatic coating or a regular cotton fabric, so that small screws don't get lost and scratch the case. The absence of dust is critical, as it can get under the display or into the connectors.
To work with Xiaomi Redmi 4 will require a specific set of tools, which is not always in the standard home first aid kit. The main element will be the heater, since the screen is planted on a sufficiently strong adhesive layer. Without preheating, there is a risk of damage to the matrix when trying to separate it from the frame.
- 🔧 Precision screwdrivers (cross-haired) P2/P3 hull-rotor).
- 🔥 Hair dryer building or household heating pad for heating glue.
- 💳 Plastic card or thin mediator for snapping latches.
- 🧲 Magnetic mat or organizer for sorting screws.
- 🧤 Thin plastic blades (poodgers) for working with plumes.
Special attention should be paid to the suction cup, which is necessary to create an initial gap between the screen and the body after heating, the use of metal tools at this stage is strictly prohibited, as they can split the glass of the display or damage the touch scan.
⚠️ Warning: Before starting any work, be sure to turn off your smartphone. Working with current under voltage can lead to a short circuit and failure of the power controller.
Diagnosis of the battery status and the choice of a new
Before you disassemble the device, make sure that the problem lies in the battery. Software failures can also cause rapid discharge. Check the usage statistics in the section Settings → Battery. If the discharge schedule looks linear and predictable, but the run time has been reduced by many times, most likely, the resource of the chemical element is exhausted.
Visual inspection can also provide answers, because if the back of the smartphone has started to recede or the screen has arched, it is a sure sign that the battery is swelling, in which case the device is dangerous to operate and you need to replace it immediately. The new battery must be labeled according to the model BM45.
📊 Have you experienced battery bloating?
Yeah, the body's open.
No, just sit down fast.
Not yet.
Changed the battery preventively
When buying a new battery, pay attention to the manufacturer. Xiaomi original parts have holograms and QR-Copies often have lower real capacity than claimed and may incorrectly display the percentage of charge in the system.
How to check the date of production of the battery?
The tail or battery case is often stamped with a date code. The first two digits can mean a year, the next two can mean a month. Avoid buying batteries that have been in storage for more than 2-3 years, even if they have not been used.> The process of disassembling the Redmi 4 smartphone is the most difficult step is to neatly separate the display module. Heat the screen perimeter with a hairdryer to a temperature of about 80-90 degrees Celsius. Keep the hairdryer at a distance of 3-5 cm and constantly move it so as not to overheat one point. After heating, glue the suction cup at the bottom of the media, while simultaneously hurling the over the top of the media, you can not be overloaded to the display. After snapping all the edges, lift the module. ☑️ Ready to disassemble Heat the perimeter of the screen Disconnect the suction pod lower faceTransfer the mediator on the sidesTest the absence of glue at the top plume: 0 / 4 You don't have to lift the screen up high. You first have to disconnect the plumes from the motherboard. The protective metal plate that covers the connectors is usually screwed up with a few screws. Unscrew them, carefully remove the plate, and disconnect the plumes by putting them up with a blade from the bottom up. Replace the battery and connect the plumes After the display module is fully separated and placed in a safe place, access to the internal components is opened. 4 And this is fixed to a double-sided tape, and it's covered with a black metal plate, which also acts as a ground screen, and this plate is screwed to the frame. You're going to have to unscrew all the screws that hold the battery plate, and they can be anywhere from 4 to 6, and they can be of different lengths, and remember or record the location of each screw, so that you don't screw a long screw into a short hole when you build it. Component Type of fastening Features of Risk Removal Display Module Glue + plume heating + Suction Breaking glass, plume break Protective plate of the battery screws (different length) Unscrew screwdriver Damage to thread, loss of screws Battery Two-way Scotch Heating + Plastic blade Puncture battery, fire Trails Clamping connectors Swap the blade Contacts Hall, damage to the tracks To remove the old battery it is also desirable to warm up a little to soften the glue. Filt it with a plastic blade, starting at the bottom edge where the plume is located. Pull carefully, trying not to deform the battery itself. If the battery is swelling, be extremely careful - any puncture can cause a chemical reaction. Put the new battery in place by removing the protective film from the adhesive layer (if any) or applying a new double-sided tape. Press the battery tightly across the area. Connect the battery plume to the motherboard before the characteristic click. ⚠️ Warning: Never attempt to pierce or bend the battery. Damage to the lithium-ion battery's inner shell can cause instant ignition and chemical burn. Assembly of the device and initial start of the Assembly is done in reverse order. Place the metal plate that covers the battery and twist all the screws, make sure that no wires or plume are caught or squeezed. Then, connect the display and touchscreen plumes to the motherboard, and before you finally stick the screen, it is recommended to perform a primary start. Connect the plumes, press the on button and wait for the Mi logo to appear. If your smartphone is switched on, check the sensor and the image display, and this will avoid re-disassembly in the event of a malfunction of the new battery. If everything is functioning correctly, degrease the frame and edges of the display with alcohol or a special cleaner. Apply a new glue (B-7000 Or analogues, a thin strip along the perimeter, attach the screen, press it tightly, and lock it with rubber bands or loads until the glue is completely dry (usually. 1-2 Calibration of the battery other errors After the battery is replaced, the system may not correctly display the level of charge. To make the power controller "understand" that it has a new battery, it is recommended to conduct a calibration procedure, this is especially true if the percentage of charge jumps or the phone turns off when the battery is turned off. 15-20%. The calibration process is simple: discharge the smartphone until completely turned off, then put on charging in the off state until 100%. After reaching full charge, hold it on charging again. 1-2 Then turn on the phone and use it normally until the next full discharge. 💡Battery calibration is a software-based controller setting that helps the system correctly determine the actual capacity of a new battery, and a common mistake is to use poor-quality glue or excess glue. Excess glue can squeeze inside the body and damage components or stain the inside of the glass. It's also important to remember to put all the plastic plugs and screws in place, otherwise the case will get stuffed with dust. What if the phone doesn't turn on after you change? First of all, check the density of the battery plume connection. Often the connector doesn't get up completely the first time. Disconnect and reconnect it, making sure the characteristic click. If that didn't work, check the integrity of the plume for the ruptures and make sure the new battery is charged (sometimes they come completely discharged). Physically installing a larger battery in a standard Redmi 4 case is impossible without damaging the structure, as the dimensions are strictly standardized. Using thicker batteries will cause the screen to be squeezed out and broken. It is recommended to look for original containers or quality analogues with marking BM45. How long does the B-7000 glue dry? The B-7000 glue first gets caught in 3-5 minutes, but it takes 12 to 24 hours to fully polymerize and gain maximum strength. In the first hours after assembly, try not to put the smartphone under stress or use it actively. Should you reset after replacement? Hard Reset is not a requirement when replacing the battery. However, if you have seen software glitches associated with power consumption, reset can help eliminate the remnants of old energy saving configurations.