How to change the battery on the phone Xiaomi Redmi 4X

Xiaomi Redmi 4X has earned its status as a favorite thanks to a combination of price and performance, but time is not spared lithium-polymer batteries. If your device began to quickly discharge, spontaneously turn off when charged 20-30% or inflated, then it’s time to think about replacing the battery. This is a standard procedure for gadgets released several years ago, and it allows you to return the device to its former autonomy without buying a new phone.

Owners often face a dilemma: carry the device to a service center or try to perform repairs on their own. The process of replacing the battery in the Redmi 4X model requires care, but it is quite accessible to a person with minimal technical skills and the right set of tools. It is important to understand that the internal layout of modern smartphones is dense, and careless movement can damage the plumes or break the screen, so careful preparation and calm are key factors for success.

In this article, we will take a look at all the steps from choosing a new battery to final assembly of the case, what tools you will need, how to safely turn off the plumes and what to pay special attention to when installing a new power module. A properly executed replacement will not only solve the energy problem, but also prolong the life of your favorite gadget for several more years of active use.

⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to disassemble the enabled device can lead to short circuit and irreversible damage to the motherboard.

Diagnostics and selection of a new battery

Before starting disassembly, you need to make sure that the problem lies in the physical wear of the battery, and not in software failures or malfunction of the charge controller. If the phone is warming in standby or discharged abruptly, these are sure signs of degradation of the chemical composition of the element. For the Redmi 4X, the standard capacity is 4100 mAh, and the deviation from this value in a smaller way indicates the need for replacement.

The choice of a new battery is a critical step, which depends not only on the time of operation, but also on the safety of operation. The market is saturated with fakes that can not hold a charge or, worse, swell after a month of use. The original is usually marked with the code BN41, and this is the model to look for. Avoid nameless analogues and too cheap offers, as a quality cell can not cost suspiciously little.

When buying, pay attention to the date of production indicated on the package or the element itself. Lithium polymer batteries tend to age even without use, so buying a battery that has been in storage for three years does not make sense (BMS) at the end of the battery, which is responsible for controlling overcharging and overdischarge.

• 🔋 Look for the markings. BN41 Battery-based compatibility is guaranteed with Redmi 4X.
• 📅 Check the production date: optimally, if no more has passed since the release 6-12 months.
• 🛡️ Make sure there is a protective chip on the battery board to prevent overheating.
• 🏪 Buy components only from trusted suppliers with positive reviews.

⚠️ Warning: Never use a bloated battery, mechanical pressure on such a battery during disassembly can cause fire or chemical burns.

Tools and workplace preparation required

You can't repair quality without the right tools. You'll need a specific set to disassemble the Xiaomi Redmi 4X, because it's built on different types of screws and has a plastic case that's easy to damage. The main tool is a set of screwdrivers that includes a cross PH000 and maybe a small flat screwdriver to work with latches.

The most important element of preparation is the organization of the workspace. All screws should be folded into separate cells or on a magnetic mat, signing the dismantling steps. Redmi 4X uses screws of different lengths, and if you confuse them during assembly, you can damage the thread in the plastic or penetrate the body through, and you will need a mediator or plastic card to crack the case.

To work with adhesives, if present, or to soften the glue residue under the battery, you may need a hairdryer. However, with a plastic back cover Redmi 4X you need to be extremely careful: overheating will lead to deformation of the plastic. It is better to use minimum temperatures and not keep the flow of hot air in one place for a long time.

• 🔧 Precision screwdrivers (cross-haired) PH000, flat).
• 📱 Plastic mediator or unnecessary plastic card.
• 🌡️ Hair dryer for softening glue (use with caution).
• 🧲 Magnetic mat or organizer for sorting screws.
• 🧤 Antistatic gloves to protect contacts from oxidation.

The process of disassembling the smartphone body

We start disassembling from the bottom of the device, where the charging connector is located. There are two screws that hold the bottom of the case. After they are unscrewed, do not immediately try to remove the lid, it is held on latches around the perimeter. Carefully insert the mediator into the junction between the frame and the back cover and drive them along the perimeter, snapping the locks.

And when you take the back plastic panel off, you'll see the inside of the smartphone, and the first thing you need to do is to unscrew the screws that hold the decorative plastic lining that covers the main components, and they're usually around. 10-12 Note that screws can be hidden under stickers or rubber plugs, although in Redmi 4X They're open most of the time.

When you remove the plastic protection, you get access to the motherboard and the battery. The key is to turn off the plumes. Before pulling the connectors, make sure the phone is off. The display plume and touchscreen, as well as the main board plume, are neatly detached using a plastic blade or nail, putting them upwards. Metal tools are better not to use here, so as not to damage the contacts on the board.

Replacement of the battery and connection of plumes

Now that the insides are open, you can start removing the old battery, which is mounted with double-sided tape in the Redmi 4X, and you can never try to rattle the battery with a metal object, which is guaranteed to cause a puncture and fire. Use a plastic card or a special spatula, gently sticking it under the battery and slowly separating it from the body.

If the battery is sitting very tightly, you can slightly warm the back of the body with a hairdryer (with the lid already removed) or use a thread (for example, a dental one), passing it under the battery and cutting through the adhesive layer with sawing movements. After removing the old battery, carefully clean the seat of glue residue so that the new element lays flat and tight.

Put the new BN41 battery in place, making sure the contact group matches the connector on the board. Carefully press the battery, but don't use the new glue until you use it. Connect the battery connector to the motherboard before the characteristic click. After that, you can temporarily turn on the phone (without assembling the body completely) to check if the system sees the new battery and if the charge is going.

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If the phone doesn't turn on after installing the new battery, check the density of the connector. Sometimes you need to remove the protective film from the contacts on the battery plume.

Assembly of the device and check of performance

Once you make sure the phone is powered on and charging, you can start the final assembly. Wipe the screen on the inside of the dust that might have gotten there during the repair. Carefully put the plumes in their channels so that they are not clamped when you install the plastic lining. Twisted all the screws that fix the protective plate, observing the order and force of the puff.

Install the back cover, starting at the top and gradually pressing it around the perimeter until all latches click. Insert two lower screws at the charging connector. After assembly, turn on the phone and wait for the system to fully load. The first minutes of the device can work unstable, as the power controller needs time to calibrate the new battery.

To work properly, it is recommended to conduct a calibration cycle: discharge the phone until it is completely turned off, then set it to charge when it is turned off to 100%, and then hold it for an hour or two on charging. After that, you can use the smartphone in normal mode, this procedure will help the system correctly display the percentage of charge.

• 🔍 Visually inspect the assembled device for gaps between the lid and the frame.
• 📶 Check Wi-Fi and cellular service – antennas are often located on or near the back cover.
• 📸 Take a test shot with the camera to make sure the integrity of the module plume.
• 🔋 Monitor the heating temperature during the first hours of using the new battery.

Typical errors and security measures

The most common mistake of beginners is to ignore the rules of electrical safety and rush. Damage to the touchscreen plume when the battery is not neatly disconnected is a common problem. Many also forget to turn off the battery before turning off other plumes, which can cause a voltage surge. Always act consistently and without sudden movements.

Another mistake is the use of inappropriate adhesive: some craftsmen use superglue (cyanacrylate), which is deposited on the camera and optics, causing blurred images. To fix the battery and elements inside the smartphone, use only special adhesive tapes (B-7000 or bilateral tape for electronics) that do not emit aggressive fumes.

Keep static electricity in mind. In dry weather, static discharge can disable sensitive electronics, work on an antistatic mat, or just touch a grounded metal object periodically to take the charge off the body. Careful attention to detail is key to successful repairs.

⚠️ Warning: If you have damaged the plume during the dismantling, do not try to seal it with tape.Damaged current tracks require a replacement of the module, otherwise a short circuit may occur.

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The main secret of success is to take your time and use only plastic tools to work with internal components to avoid short circuits.

Frequently Asked Questions (FAQ)