Xiaomi Redmi 4X has earned a reputation for being "unkillable" thanks in large part to its autonomy. However, even the best lithium polymer battery loses its original capacity over time. If your phone starts to run out in a couple of hours, shut down 20% charge or inflated body, it's time to think about replacing the battery. It's a standard procedure that can be done on your own with a minimum set of tools and accuracy.
In this article, we will discuss the replacement process in detail, paying special attention to the specifics of disassembling this particular model. It is important to understand that non-original batteries can work unstablely, so you should pay as much attention to the choice of spare parts as the installation process itself. Before starting work, make sure that you have free space and good lighting.
Replacing a power source is not just a mechanical act, it's also the ability to clean the internal components of dust. A properly done procedure will extend your gadget's life for a few more years of active use. Let's get ready to do this to avoid common rookie mistakes.
Tools and workplace preparation required
To do this successfully, you'll need a specific, but accessible toolkit, a set of screwdrivers that necessarily have a PH000 or PH00 cross-bit, and this tool you'll be using to twist the screws that lock the motherboard and the protective plates, and using the wrong screwdriver can lead to the slicing of the screw faces, which will make it much more difficult to build.
A plastic blade or mediator will also be an indispensable assistant. Metal tools are highly undesirable, as they can easily damage plumes or break through insulation. To work with adhesives that hold the battery, you will need a hair dryer or a special heating pad. The heating temperature of the back cover should not exceed 80-90 degrees Celsius, so as not to damage the display matrix or plastic elements of the case.
- 🔧 Precision screwdrivers (cross-haired) PH000)
- 🧸 Plastic blade or mediator for opening
- 🌡️ A dryer for softening glue (or suction cup)
- 🧲 Magnetic screw-sorting mat
Prepare the workspace in advance. The surface should be clean, flat and well-lit. It is recommended to use an antistatic mat, although this is not always critical for home repairs. The main thing is not to lose small screws, as their sizes may vary in different nodes of the smartphone.
Diagnostics and selection of a new battery
Before you disassemble the device, make sure that the problem lies in the battery. Software failures or “heavy” applications can also quickly put the charge. However, if a visual inspection revealed bloating or the phone is only running from the charger, a replacement is inevitable. When choosing a new battery, pay attention to the marking BM47 is a standard model for the Redmi 4X.
The market is full of copies that look identical to the original, but have a real capacity of half the declared. The original battery has a capacity of 4100 mAh. If you see the inscription 5000 mAh on a budget copy is a marketing ploy, it is physically impossible to fit such a charge into the dimensions of a regular battery without changing the chemistry, which is not used in cheap models. Use applications to check the charge cycles and current state of the battery before buying.
How to distinguish the original from the fake?
When purchasing components, make sure that the kit includes duct tape or double-sided tape for fixation. Some vendors complete the battery with the necessary kit for installation, which eliminates the need to search for glue separately, which simplifies the process and ensures the reliability of the fixation.
The process of disassembling the Redmi 4X hull
Disassembly begins with the device being turned off, and it's a safety rule that will prevent short circuits from breaking off the plumes. SIM-Next, you need to unscrew the two screws located at the bottom of the smartphone on the sides of the charging connector. USB Type-C (in this micro-USB model) Be careful not to lose them.
The Redmi 4X back cover is plastic and is mounted on perimeter latches as well as double-sided scotch. Carefully warm the perimeter of the lid with a hairdryer for 1-2 minutes. Don't heat the center part where the battery is located. Using a suction cup or plastic card, snap the lid starting at the bottom corner. Move along the edges, freeing the latches.
- 📱 Turn off the phone and remove it. SIM-tray
- 🔩 Unscrew 2 lower screws near the charging connector
- 🔥 Carefully warm the perimeter of the back cover with a hairdryer
- 🪛 Click the lid with a plastic spatula in a circle
When you remove the lid, you'll see the inside of your smartphone, and you'll immediately disconnect the battery plume from the motherboard if you're planning to do long-term work with other components, but you can do that later when you get to the safety plate, and in the Redmi 4X, the battery is covered with a metal lid that's screwed up with a few screws.
Dismantling an old battery and installing a new one
To access the battery, remove the metal protective plate covering the top of the battery and the plume connectors, which is attached to 4-5 screws of different sizes. Remember or write down the location of each screw, as they may differ in length. After removing the plate, disconnect the battery plume from the connector on the board, detach it with a plastic blade.
The hardest part is removing the old battery, and it's glued to the body with a powerful two-way tape, and in no case try to pull the battery out by the wires or pick it up with metal objects from the bottom, because the risk of puncture and fire is very high, and put a plastic card on the bottom end of the battery (where the contacts are) and carefully, slowly separate it from the body, warming the area under the battery with a hairdryer.
☑️ Pre-assembly check
Install the new battery by applying a new layer of glue or using the pre-made adhesive strips from the kit. Make sure the contact group sits tightly in the connector. Press the battery over the entire area for a secure fixation. Now you can put the metal protective plate back in place and twist all the screws in reverse sequence.
| Work phase | Tool. | Implementation time | Difficulty |
|---|---|---|---|
| Removal of the back cover | Fen, spatula | 5-10 minutes | Low. |
| Dismantling of the protective plate | Screwdriver PH000 | 3 minutes | Low. |
| Battery recovery | Fen, map | 10-15 minutes | Medium |
| Assembly of the device | Setting screwdrivers | 10 minutes | Low. |
First start and calibration of the battery
Once the new battery is physically installed, you need to properly start the first battery. Connect the phone to the charger without turning it on. Let it charge to 100% when it's off. This will help the power controller correctly determine the capacity of the new battery. After you fully charge, turn the device on.
In Android, it may take some time to recalculate the power consumption statistics. If the indicator shows incorrect percentages (for example, jumps from 90% to 50%), it is recommended to conduct a calibration procedure. It consists of completely discharging the device before turning off, followed by charging to 100% when off. Repeat the cycle 2-3 times for best results.
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To extend the life of a new battery, try to avoid a full discharge of 0% in everyday use, the optimal range for lithium polymer cells is from 20% to 80%.
Check the touchscreen and display after assembly. Sometimes, if you build it in a sloppy way, you accidentally hit the plume of the display, which will lead to stripes or broken zones. If everything is functioning normally, congratulations, you have successfully updated your smartphone.
⚠️ Warning: If after the battery replacement the phone does not turn on or warms up in the battery area, immediately turn off the charging and check the connection of the plume.
Possible problems and solutions
Unforeseen situations can occur during the replacement process. One of the common problems is that the phone does not see charging, this can be due to oxidation of the contacts or damage to the plume during installation, and software freezes the power controller, which is solved by holding the power button for a long time (15-20 minutes).
If you find that the speaker or microphone is not working after assembly, check the clamping slats. In the Redmi 4X, some components are pressed by metal plates, and the absence of one screw can disrupt contact.
- 🔋 Phone does not turn on: check the battery plume
- 🔌 No charging: Clean the connector or check the controller
- 📉 Fast discharge: perform calibration or check background processes
In rare cases, a new battery may be defective. If after 5-10 charge-discharge cycles, autonomy has not improved, it is worth contacting the seller to replace the product under warranty.
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Replacing the battery gives the smartphone 80-90% of its original autonomy, making the procedure cost-effective compared to buying a new device.