How to replace the battery on Xiaomi Redmi 4: step-by-step repair

Redmi 4 series smartphones have earned a reputation for being “unkillable” thanks to the combination of metal housing and autonomy, but even the most reliable lithium-ion batteries lose their capacity over time. If your phone stops holding charge, turns off in the cold or swells, the only effective solution is a physical replacement of the battery. Self-repair saves a significant amount compared to going to the service center, but requires accuracy and understanding of modern electronics.

The process of replacing the battery with Xiaomi Redmi 4 (Prime/Standard) is not a super-complex one, but has its own technological nuances associated with dense layout and use of adhesives. You will need not only a new battery, but also a specific set of tools, including heating elements and suction cups. It is important to understand that leakage of the case when you open sloppy can lead to moisture entering the interior, so all actions must be performed in a dry room with good lighting.

Before you start dismantling, make sure you get a quality copy of the original or a certified counterpart, as the market is oversaturated with fakes with understated real capacity. A poor battery can damage the power controller or even cause fire, so saving on this component is unacceptable. In the next sections, we will discuss in detail the preparation of the workplace, the process of disassembling the case and the correct installation of a new energy source.

Diagnosis and selection of components

The first step before any manipulations are initiated is to accurately diagnose the battery status ##6485## c) "calling", allow the current capacity (parameter) MB_06) and number of recharge cycles (MF_05), But they don't always show the real wear of the chemicals. 20-30% charge or back cover deformed from the inflated battery, replacement is necessary immediately, regardless of the indications of the software.

When choosing a new battery for Xiaomi Redmi 4 (model BN41), pay attention to the marking and appearance of contacts. the original elements have a clear engraved, protective hologram and smooth plumes without traces of oxidation. The charge controller located on the battery board itself must be securely fixed and not have bloating. Using cheap analogues often leads to the fact that the phone after a month of operation again begins to quickly discharge or completely stops turning on.

• 🔋 Be sure to check the date of production on the package - lithium cells age even when stored, and the battery, which has been in storage for 3 years, has already lost some of the properties.
• 🔍 Check the connection connector: it should perfectly match the response part on the motherboard of your smartphone, as different versions of the Redmi 4 they may differ.
• 🛡️ Make sure that the protective film is on the contacts of the new battery – this is a sign that the element was not in use and is protected from short circuit.

⚠️ Warning: Never use batteries that have bloating, body damage or electrolyte marks on the contacts to replace them!

Tools and training required

To successfully perform the replacement procedure, you will need to assemble a certain set of tools, without which a safe disassembly of the Redmi 4 is almost impossible. The key is to warm the perimeter of the body, since the screen and frame are held on a fairly strong adhesive layer. The use of a hair dryer in this case is inefficient, you need a building hair dryer or a special heating pad that can maintain a temperature in the region of 80-100 degrees Celsius.

In addition to thermal impact, mechanical tools will be required to snap latches and unscrew screws. screws in Xiaomi often have a custom head, so a regular cross screwdriver may not fit or damage the fastener cap. All tools should be placed in a convenient order on a magnetic mat or in the organizer, so that small details do not get lost in the process of operation.

Special attention should be paid to the organization of the workspace. The surface of the table should be clean, dry and do not conduct static electricity, which can damage the sensitive electronics of the smartphone. It is recommended to prepare the screw folding capacity in advance, since Xiaomi uses screws of different lengths, and confuse them during assembly is extremely easy, which can damage the motherboard.

The process of disassembling the Redmi 4 hull

Start disassembling Xiaomi Redmi 4 is necessary by removing the tray for SIM-cards to provide air exit when heated and avoid pressure inside the case. After that, turn on the building hair dryer and evenly warm the perimeter of the device, paying special attention to the angles and places of connection of the screen with the frame. The heating temperature should not exceed 100-110 degrees, so as not to damage the display matrix or melt plastic elements of the internal structure.

Once the body is sufficiently warmed up (usually it takes 2-3 minutes), carefully insert the suction cup at the bottom of the screen or on the side where there is a slight gap. Pull the suction cup up, creating tension, and simultaneously insert a thin plastic card or mediator into the resulting gap. Move the map along the perimeter, cutting the adhesive layer, but try not to immerse the tool too deeply, so as not to touch the plumes coming from the control buttons.

Once you've separated the screen from the frame, you need to remove the metal shield that covers the main nodes of the smartphone, and it's attached to a lot of screws of different calibers, so you can be methodical, remembering the location of each fastener. Under the plate, you'll find the camera module, the plume connectors and the battery itself, closed with another layer of glue or locks.

Dismantling the old battery

The most critical step in replacing the battery is to disconnect the battery plume from the motherboard. Before touching any internal components, you need to turn off the device by disconnecting the battery connector, and do this with a special plastic blade or nail, avoiding the use of metal tools that can cause short circuits or damage the connector contacts.

In the Redmi 4, the battery is often glued to the body with double-sided tape, so it will require reheating to re-extract it. Heat the back of the case (now the internal metal frame) in the area of the battery. After warming up, use a plastic card to gently tuck the battery, trying not to damage its shell and not deform.

It is strictly forbidden to try to pull the battery over one edge or pierce it to make it easier to extract.Mechanical damage to the lithium polymer cell can lead to instant ignition or chemical burn. If the battery sits very tightly, it is better to spend more time gently loosening and warming up than risk the integrity of the smartphone.

⚠️ Warning: If you damage the battery shell during the extraction process and smell a sharp chemical smell or smoke, stop working immediately, take the device out into an open space and fill it with sand.

Installation of a new battery and assembly

Before installing a new battery, you need to carefully clean the seat of the residue of old glue and tape. Use soft fabric soaked in isopropyl alcohol to degrease the surface of the metal frame. The cleanliness of contact is important for efficient heat sinking, as the battery heats up during operation, and the presence of air pockets due to dirt can worsen temperature regime.

Apply a thin layer of new adhesive (such as the B-7000) to the perimeter of the seat, or use special adhesive tapes complete with quality batteries. Set the battery, press it tightly and plug the plume until the characteristic click. Make sure the connector is flat and unskewed, as improper connection can lead to a lack of charge or unstable phone operation.

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Before the final sealing of the case, test the phone turn on. This will make sure that the new battery is working and the plumes are correctly connected without fully assembling the device.

The assembly is done in reverse order: first, a protective metal plate is installed and all screws are twisted, then the buttons and touch screen are checked, only after making sure that the device is fully functional, you can apply glue around the perimeter of the frame and press the screen or back cover (depending on the design of the specific modification), the polymerization time of the glue is from 2 to 4 hours, during which it is better not to use the phone.

First start and calibration of the system

After successful battery replacement and body assembly, calibrate the phone to ensure the power controller correctly displays the charge level. Android may "not realize" that the capacity is restored, and show incorrect percentages or quickly discharge at the beginning of the cycle. First, completely discharge the phone before automatically turning off, and then put on charging when off to 100%.

After reaching full charge, don't take the device off the grid for another 1-2 hours to go through the low-power saturation stage. Then turn on the phone and check the indicator. If the system is 100 percent, but after a minute of use drops to 90-80%, the full discharge-charge cycle procedure is worth repeating. In some cases, resetting to factory settings through the Recovery menu helps, but this is an extreme measure.

• 📉 Take it. 2-3 full charge-discharge cycle for training the chemistry of the new battery and setting up the controller.
• ⚙️ Turn off aggressive modes in the energy saving settings that can artificially limit the operation of background processes.
• 📱 Install a battery monitoring app (such as AccuBattery) to track real capacity and wear rate in the dynamics.

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High-quality battery calibration takes up to 3 days of cyclic charging, but it ensures the correct operation of Xiaomi’s energy saving system.