Replacement of the battery in Xiaomi Redmi Note 4X: the complete guide

Xiaomi Redmi Note 4X has earned legendary status due to its reliability and autonomy, but even the highest quality lithium-polymer cells lose capacity over time. If your device stops holding charge or turns off by 20-30%, most likely, battery life is exhausted. Self-replacement is a real way to return the gadget to a second life without overpaying service centers.

However, the replacement process requires precision and understanding of design. Unlike modern solid glass models, the Redmi Note 4X has a metal body, which makes it easier to access, but requires careful handling of plumes. It is important to understand that any interference with the design of the device carries risks, so you need to assess your strength and prepare the workplace before starting work.

In this article, we will discuss how to safely remove the battery without damaging other components of the system, you will learn what tools you need, how to turn off the power correctly and what nuances you should pay special attention to.

Tools and workplace preparation required

To replace a battery properly, you don't need to have a screwdriver on hand, you need a dedicated toolkit that will keep your hands safe, and you will need a set of precision screwdrivers that include PH00 and PH000 cross bits.

In addition, to work with the body and plumes will need:

• 🔧 Plastic mediators (scapula) for opening the body without scratches
• 🔧 Suction cup for gently lifting the back cover
• 🔧 Tweezers with curved ends for extracting small details
• 🔧 A hair dryer or thermophen to soften glue

So, you can organize your workspace so that all your tools are within reach, the surface of your desk is clean, flat, and you can't conduct electricity, and you can do it with an antistatic mat, but you can use a regular wooden board, and you can also use static electricity to disable sensitive electronics.

⚠️ Before starting work, be sure to remove metal rings and bracelets from your hands to avoid short circuits when accidentally touching internal components.

Diagnosis and safety measures before disassembly

Before you start physically disassembling, you need to make an initial diagnosis, make sure that the problem is in the battery, not a software failure or power controller. If the phone quickly discharges, warms or inflates the battery, then replacement is inevitable. In case of bloating, you need to act with the utmost care, because a damaged Li-Pol cell can be a fire hazard.

The optimal charge level for starting work is about 25-30%. It is not recommended to completely discharge the device before disassembling, as this can make it difficult to enter recovery mode if necessary, and it is also worth backing up the data, although they usually do not suffer when replacing the battery.

It is important to check for traces of moisture in the charging connector or speakers. If the smartphone has previously been in contact with water, there may be oxides inside that complicate the dismantling process, in which case it is better to further treat the contacts with alcohol after opening.

Removal of the Redmi Note 4X Rear Cover

The Xiaomi Redmi Note 4X design involves mounting the rear panel to screws and adhesive base. Unlike many modern models, there is no need to heat the body perimeter with a hairdryer, since the cover is held mainly on mechanical fixtures and several glue points at the bottom.

First, you need to take out the tray. SIM-Then you flip the smartphone down, and you'll see two screws at the bottom of the case, next to the charging socket, and you'll have to unscrew them using a screwdriver. PH00. After that, take a suction cup, attach it to the bottom of the lid and slightly pull up, while inserting a plastic spatula into the resulting gap.

Keep the blade along the perimeter of the case, carefully snapping plastic latches. Pay special attention to the corners and areas around the camera. Do not make excessive efforts not to break the locks. If the lid does not lend itself, you can slightly warm the bottom part with a dryer at low temperature for 30-40 seconds.

Dismantling internal components and access to the battery

When you remove the back cover, you'll see the inside of the smartphone, and most of the space is occupied by a metal screen that covers the motherboard and the plumes, and this screen is mounted with many different sized screws, and to avoid confusion, it's recommended that you use a magnetic mat or spread the screws in the order of their removal.

First of all, you need to turn off the battery plume. Find the connector at the top of the board, and carefully disconnect the connector by putting a plastic blade or nail on it. Only then you can start to unscrew the screws that attach the metal protection. Note that some screws may be hidden under stickers or plugs.

Next, you take off the bottom board, where the charging connector is located, and it's mounted with multiple screws and connected to the main board with a wide plume running along the case. Carefully bend the plume and disconnect it. Now access to the bottom of the battery is open.

Removing it often requires removing the motherboard itself, or at least lifting it partially because the battery is underneath it, a critical moment that requires special attention to the thin plumes of the display and buttons.

⚠️ Warning: Never use metal tools to disable plumes.The metal can damage contacts or cause a short circuit on the board, which will lead to irreversible consequences.

Removing the old battery and installing a new one

The most difficult part is to remove the old battery, which is attached to glue, as mentioned earlier, and it's strictly forbidden to pull the battery or try to pull it out while holding the wires, because they can come off, and you can't use sharp metal objects to avoid piercing the battery case.

The ideal method is to use a plastic card or a special hood. If the battery is sitting very tight, you can use a thread (for example, a dental floss) by passing it under the battery and cutting the adhesive layer with sawing movements, before this, it is recommended to apply a little isopropyl alcohol under the edges of the battery to soften the glue.

After removing the old element, clear the niche of glue residues.The new battery should be compatible with your model.The original marking for the global version of the Redmi Note 4X (snapdragon) is BN41. Make sure the voltage and capacity match the original (usually 3.85V and 4100 mAh).

The new battery is installed in reverse order. Apply a new double-sided tape to the bottom of the niche, gently insert the battery, straightening the plume. Connect the battery connector to the board before you click, making sure that positioning is correct.

Device assembly and initial start

The Xiaomi Redmi Note 4X is a process that requires consistency, first installing the motherboard (if it was removed) and slinging a metal shield, then plugging all the plumes: display, buttons, bottom board, each connector must be fixed with a pinch bar.

Once all the components are connected, you can test without turning the screws permanently. Press the power button. If the screen catches fire and the phone starts charging, you've done everything right. If the device doesn't respond, double-check the battery plume and the main plume.

If you're successful, turn off your phone, set the bottom board, put the plumes through the channels, and close the case. Twirl all the screws, paying attention to their length -- long screws in short holes can damage the board. Twisted two screws at the bottom of the case and install plugs.

For the first few charge-discharge cycles, try to keep the phone from completely discharging to zero, which will help calibrate the controller and accurately display the percentage of charge, and it is also useful to test for heating during charging and active operation.

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Use isopropyl alcohol to clean contacts and soften glue – it evaporates quickly and does not conduct electricity, unlike water or other solvents.

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The main challenge of replacing the Redmi Note 4X is access to the battery through the upper part of the case, requiring partial dismantling of the motherboard.

Frequently Asked Questions (FAQ)