How to remove the battery Xiaomi Redmi Note 4: Full instructions

Xiaomi's mobile devices are famous for their autonomy, but over time, even the most reliable lithium-polymer batteries lose capacity. If your Redmi Note 4 starts to quickly discharge or turn off in the cold, it's likely time to replace the power source. The replacement process is not trivial, since modern smartphones are designed with the monolithic body, which requires accuracy and special tools.

Before you start physical intervention, you need to be aware of the risks, the internal components are tightly packed, and the battery is often attached to a powerful adhesive layer. Wrong actions can damage the display plumes or, worse, puncture the battery itself, which is fraught with ignition, so the preparation of the workplace and tools here plays an even greater role than in normal situations.

In this article, we will discuss in detail how to safely remove the Xiaomi Note 4 battery, what tools you will need and what nuances you should pay special attention to. You will learn about the technical features of the Xiaomi Redmi Note 4 model (codenamed "mido"), which distinguish it from other devices of the brand. Careful adherence to the algorithm will extend the life of your gadget without contacting the service center.

Preparation of the workplace and necessary tools

Quality training is half the success of the whole operation. Mobile electronics require not only straight hands, but a specialized set as well. You'll need a screen lifting suction cup, plastic mediators (scapula) to snap latches, a set of Phillips screwdrivers of various sizes, tweezers with thin curved ends and, preferably, a thermophen or heating pad for softening the glue.

Particular attention should be paid to lighting. Small screws and plumes are poorly visible in dim light, and the loss of one micro-screw can be fatal to build. The work surface should be clean, flat and preferably have a magnetic mat or tray for sorting screws, since the Xiaomi Redmi Note 4 uses fasteners of different lengths.

⚠️ Warning: Before starting any work, be sure to turn off the device. Attempting to remove the battery when the phone is turned on can lead to a short circuit on the board and failure of the power controller.

You don't need to use metal tools like a knife or steel ruler to open the case. Metal can damage plastic frames, scratch the display glass or, worse, damage the internals if the tool slips. Plastic blades and mediators are the industry standard precisely because of their safety for components.

Also prepare a heating tank. If you don't have a professional thermophen, you can use a regular household heating pad or even a hair dryer, although the latter is less effective for evenly warming large areas. The heating temperature should not be extreme, just warm the perimeter to a comfortable hand condition to activate the thermoglue.

The process of dismantling the back cover and protective screens

The Redmi Note 4 has an all-metal body, making it harder to access the insides compared to plastic counterparts. The first step is always to remove the tray for the scaling. SIM-This is a critical point, as screws are often hidden under or near the tray, and trying to open the case with the card installed can damage it.

Once you remove the tray, look at the bottom end of the device, and you'll find two screws that lock the frame near the charging socket. Use a thin cross screwdriver to unscrew them. Act without undue effort to avoid breaking the thread in the aluminum case. The screws are best placed in a separate cell of the organizer.

Now, to the most difficult phase of the initial disassembly, heat the perimeter of the back cover, move evenly throughout the circuit, paying special attention to the corners, when the case heats up, install a suction cup at the bottom of the rear panel, just above the dynamic grille, and pull up to create a gap, insert a plastic mediator into the gap.

Drive the mediator along the edges, carefully cutting the adhesive layer. Do not enter the tool too deep so as not to touch the plumes coming from the buttons or antenna wiring. Move slowly, feeling the resistance of the glue. If the lid does not respond, warm up the problem area again. Sharp jerks can lead to deformation of the metal frame.

Disconnection of plumes and removal of the main board

When you successfully remove the back cover, you'll see the interior of the smartphone, and most of the space is occupied by the battery, but at the top is a motherboard that's covered by a metal screen, and this screen is screwed with a few screws that you also need to unscrew. Be careful, there may be plumes underneath these screws.

The main challenge at this point is to turn off all the connectors that connect the board to the rest of the components. First of all, the battery plume is turned off. It is located closer to the center or top, depending on the revision of the board. Use a plastic blade or nail to plug the connector up. Never pull the plume wires, only the hard part of the connector.

Then the display and touchscreen plumes are turned off, and they're usually next to each other, and they can be protected by an extra metal bar, and once all connections are turned off, you can carefully remove the motherboard, and lift it evenly, making sure nothing gets caught in the frame or the antenna contacts.

With the fee, you will have full access to the bottom of the case, where the battery itself is located. However, before you start removing it, you need to dismantle the vibrator, the lower board with the charging connector and the antenna cable if it passes over the battery. Antenna cable is often glued to the battery, and it needs to be carefully separated, heating the joint.

Technology of safe recovery of the battery

The battery in the Xiaomi Redmi Note 4 is glued to the case throughout the area, which is made for better heat transfer and fixation, but makes it difficult to replace. You can't just pull the tongue (if you have one and you have one) - it's almost guaranteed to break. The only safe method is using a thread or a thin line.

Take a strong thread (like a dental floss or fishing line) wind it over the top edge of the battery. Move the thread left-right like a saw, slowly descend, cutting the glue layer. Movements should be smooth, without jerks. If the thread gets stuck, don't pull harder - it's better to add a little heat on the back of the case (if it's not already removed completely) or just warm up the area of work.

⚠️ Note: It is strictly forbidden to use metal objects (knife, screwdriver) to tweak the battery.Puncture of the li-Pol battery shell causes an instant chemical reaction with ignition and release of toxic gases.

When you retrieve, watch the battery, and if you notice the bloating, it's a sign that the chemicals inside are already going irreversible, and the bloated battery needs to be removed with double caution, because the shell is thinner and the risk of puncture is high, and in these cases it sometimes makes sense to completely deplete the device to reduce the chemical activity, although it takes time.

Once the glue is cut around the perimeter and in the center, carefully remove the old power cell. Don't throw it into a regular garbage can - lithium batteries require special disposal.

Installation of a new power supply and assembly

Before you put a new battery in, you need to clear the bed of the residue of the old glue. Use an isopropyl alcohol and a plastic card or a spatula. The surface should be smooth and clean so that the new battery will fit flat and tightly to the housing for effective cooling. The residue of the old glue can create an air cushion, which will overheat the new battery.

To fix the new element, use a special glue B-7000 or double-sided electronics tape. Apply a thin layer of glue around the bed perimeter or stick strips of tape. Don't overdo it with the amount of glue, the excess can leak out when heated and damage other components. Let the glue dry a little (if it's B-7000) to a sticky state, then carefully install the battery.

Then the assembly process goes in reverse. Connect the battery plume to the board. This is the first and most important connector. Make sure it snaps to the characteristic, barely audible click. Then set the motherboard in place, plug the display plumes, touchscreen, bottom board and antennas. Check visually if all the connectors are sitting tight and even.

Install metal shields and twist all the screws. Don't forget the screws at the bottom of the case. Before the final sealing of the back cover, it is recommended to perform a test turn on. If the phone is turned on, shows the image and reacts to touch, you can apply glue to the frame and press the back panel.

Diagnostics and calibration after replacement

Once assembled successfully and first turned on, the system may show an incorrect percentage of charge. This is normal for a new power controller or a new battery that has not yet passed the calibration cycle. Android must "learn" to correctly read the capacity of the new element.

Calibration process is simple: discharge the phone to full shutdown (0%), then charge when off to 100%. After reaching 100%, hold on charging for another 1-2 hours. Then turn on the phone. If the indicator shows less than 100%, re-connect the charge. Repeat the cycle 2-3 times. This will help the system correctly display the charge level.

It's also worth checking the basic functions of the camera, the speakers, the microphone, the vibration and the touch screen, and sometimes, if you don't build it properly, you can forget to plug in the vibrator plume or damage the antenna contact, which will lead to poor reception of the network, and if everything is stable, then the replacement is successful.

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Use only original or certified high-quality batteries. Cheap analogues can have a real capacity of 2-3 times less than the declared one and quickly fail, as well as carry the risk of bloating.

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The key to the whole procedure is to handle the plumes carefully and not to rush when the battery is unstuck, and patience is more important than physical strength.

If you see a rapid discharge or heating after the replacement, it may not be the battery itself that is the problem, but the software or other components, such as the processor or communication module, in which case it is worth checking the running processes in the Settings → Battery section or resetting the settings.

Frequently Asked Questions (FAQ)