Replacement of the battery with Xiaomi Redmi 4X with your own hands: detailed instructions with photos and tips

Xiaomi Redmi 4X

4100 mAh

This article includes a step-by-step photo guide, the choice of an original or high-quality battery analog, and key nuances that are not covered in short instructions, such as how to avoid damage to the touchscreen plume or why you can not use metal mediators to disassemble. If you’ve never taken a smartphone apart, don’t worry: Redmi 4X It is more structurally simple than many modern models.

⚠️ Important: Bloated battery is dangerous! If the body of the phone is deformed, do not try to open it - the risk of fire. FAQ, How to safely remove the battery in this case.

Average life of lithium polymer batteries — 500-800 charge cycles, when used intensively through 2-3 year-over-year 30-50%, The controller is starting to crash. 4X:

• 🔋 The phone turns off when 15-30% charge and only activated from charging.
• ⚡ Charging jumps (for example, from 40% immediately to 15% or vice versa).
• 🔥 The body warms more than usual, even in simple.
• 📉 Battery life has been reduced in 2-3 once.

If you have one of the things you want, you're going to need a battery replacement, and then we're going to figure out what tool you need, how to pick up a good battery, and then we're going to take a step-by-step disassembly of the Redmi. 4X intact.

1.Preparation: Tools and battery selection

Before disassembling, prepare everything you need, and without the right tool, you risk damaging the plumes, the housing, or the battery itself.

• 🔧 Plastic mediators (2-3 - To gently lash the lid and disconnect the battery. Metal mediators are prohibited! They scratch the body and can puncture the battery.
• 🔨 Cross screwdriver (PH00 or PH0) — I'll even fit a screwdriver from the glasses set.
• 🧲 Magnetic mat or tray - so as not to lose the screws (there are 12 pieces!).
• 🔥 A hair dryer or a thermo-air station to soften the glue under the battery. Alternative: isopropyl alcohol 90%+.
• 📦 New battery – original or proven analogue (more on this below).
• 🧴 Clay. B-7000 or double-sided tape - to fix a new battery.

⚠️ Warning: Don't use superglue or instant glue! They can damage the battery controller or plumes. Xiaomi's original glue is heat-melting, so when heated, the battery detachs more easily when heated.

Now for the battery choice, the original batteries for Redmi. 4X articulate MBJ416540 or BM43 (capacity 4100 MACh, voltage 3.85V). They can be found on AliExpress, in Xiaomi parts stores or at official distributors.Price: 800-1500 Alternatives:

💡 Tip: Check seller reviews before buying.On AliExpress, look for 98-rated stores%+ and number of orders >The original battery should weigh 1,000. ~45 grams and have a holographic sticker with QR-code.

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If you're not sure about the battery, order it in advance and check it with a multimeter. 3.7-3.9V.

2.The Xiaomi Redmi Disassembly 4X: We're taking the back cover off.

Start by turning off your phone. Don't disassemble the smartphone that's on! It can short-circuit.

1. Extract. SIM-The card and the memory card, the tray is on the left end, use a paper clip or a special key.
2. Heat the back cover with a hair dryer — 60-70°C (not higher!) Warm up the edges around the perimeter. 2-3 minutes to soften the glue.
3. Put the lid on a plastic mediator, start at the lower right corner (near the charging connector), and carefully drive the mediator along the body, separating the clips.

⚠️ Attention: Don't use force! If the lid doesn't lend itself, warm up the problem area again. 4X fragile and can break.

After removing the cover, you will see:

• 📱 Battery – takes up most of the space.
• 🔧 12 screws - 10 under the lid and 2 under the sticker near the camera.
• 📶 Antenna contacts – thin metal stripes on the sides.

📌 Important: Don't touch the antenna contacts with your hands, it can degrade the network signal.

Turn off the phone.|Extract SIM-map|Warm up the lid with a hair dryer|Prepare plastic mediators|Unscrew all 12 screws-->

3. Battery disconnection: how not to damage the plumes

Now you have to disconnect the battery from the motherboard, and that's the most critical part, because a mistake here can make the phone go down.

1. Unscrew all the screws. They're of different lengths, so remember where you were. The screws under the camera sticker are the shortest.
2. Raise the board with the antennas. It's mounted on the clips. Carefully put it on the right side with the mediator (from the volume buttons).
3. Find the battery plume. It's located at the top of the board, under a metal screen, a black plume with red and black wires.
4. Unplug the connector. Use a plastic mediator or a nail. Don't pull the wires! Raise the latch of the connector up, then carefully pull the plume out.

🔍 Signs of a damaged plume:

• 🔌 The phone does not turn on after charging.
• 📉 Charging is jerky or does not go at all.
• 🔥 The hull is warming in the jack area.

If the plume is broken or damaged, you can sell it back, but it takes experience, and then you better contact the service.

⚠️ Warning: If the battery blows up, don't try to remove it by force, it may burst or catch fire:

1. Disconnect the battery plume from the board.
2. Place your phone in a sealed bag.
3. Contact the service for safe extraction.

4. Removing the old battery: glue and patience

Battery at Redmi 4X It's glued to the body with double-sided tape, and it takes patience and precision to remove it:

Method 1: Heating with a hairdryer (recommended)

1. Warm up the battery with a hair dryer at temperature 60-80°C during 3-5 Keep the hair dryer at a distance. 5-10 See to avoid overheating the fee.
2. Put a plastic mediator on the battery from any angle, and if the glue softens, it starts to move away.
3. Carefully pull the tongue (if any) or continue to poke the mediator, warming up the problem areas.

Method 2: Isopropyl alcohol (alternative)

1. Apply a few drops of isopropyl alcohol 90%+ battery-side.
2. Wait. 2-3 minutes - alcohol dissolves glue.
3. Tap the battery with a mediator and slowly separate it from the body.

⚠️ Warning: Do not use acetone, gasoline or other solvents! they can damage the plastic of the case and plumes.

💡 Tip: If the battery is not going away, don't use force. You better warm up the problem area again.

Once the old battery is removed, clean the case of any glue residues. Use a wooden stick or a plastic scraper. Don't scratch the case with metal!

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Never remove the battery by putting metal objects on it. The risk of a puncture or short circuit is extremely high!

5. Installation of a new battery: glue and connection

Before installing a new battery, check its voltage with a multimeter. 3.7-3.9V. If the voltage is lower 3.5V, The battery is discharged and must be charged before installation.

📌 Step-by-step installation:

1. Put the glue on. Use it. B-7000 Or double-sided tape, put a thin layer on the body at the contact point with the battery, and avoid getting glue on the plumes!
2. Put the battery in place carefully, and put it back in place, and you put it in the contact with the connector on the board. 10-15 fixation.
3. Put the battery connector in the socket on the board and snap the lock, make sure the contacts are not bent.
4. Check the work. Connect the charging and make sure the phone is charging. If the charging is snatching, check the density of the plume.

⚠️ Note: If after connecting the battery phone does not turn on, but responds to charging (light indicator), the problem may be in the battery:

• 🔌 Flawed contact of battery plume.
• 📱 Damaged board (check for oxidation).
• 🔋 Defective new battery (check multimeter).

💡 Tip: After replacing the battery, calibrate the battery:

1. Charge the phone to 100%.
2. Turn off charging and use the phone until it is fully discharged (before it is turned off).
3. Charge again to 100% without interruption.
4. Repeat the cycle 2-3 times.

This will help the controller to correctly determine the capacity of the new battery.

6. Assembly of the phone: reverse order of action

Build Redmi 4X After the battery replacement occurs in reverse order, but there are several nuances:

• 🔧 Screw them cross-curl to avoid board skewing.Start with corner screws.
• 📶 Antennas: Make sure the antenna contacts are not bent and fit tightly to the board.
• 🔋 Back cover: Before installation, clean it of dust and glue residue. Clips should snap with a slight click.

📌 Assembly procedure:

1. Set the board with antennas in place and secure with screws.
2. Connect the camera plumes, speaker and buttons (if they were disconnected).
3. Lay antenna contacts and secure them with clips.
4. Warm up the edges of the body with a hairdryer (60)°C) for better cap fixation.
5. Set the back cover starting at the bottom edge and click the clips around the perimeter.
6. Twisting all the screws.

⚠️ Note: If the phone does not turn on after assembly, check:

• 🔌 Correct connection of all plumes.
• 🔧 All screws (extra screws can shorten the fee!).
• 📱 Battery contacts (possibly oxidized).

💡 Tip: After assembly, check the work of all functions:

• 📞 Calls and mobile internet (check the signal).
• 🔈 Speakers and microphone.
• 📷 Camera (front and main).
• 🔋 Charging and discharging the battery.

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If the battery changes, the phone gets worse at catching the network, check the antenna contacts. They might have left when you build them.

7. Frequent mistakes and how to avoid them

Even with a careful battery replacement, you can make mistakes that will cause your phone to malfunction, and here are the most common ones and ways to prevent them:

🔧 How to Know If You Made a Mistake?

• 🔥 The phone is warming up more than usual → Possibly short circuit or damaged controller.
• 📵 No network or weak signal → antenna contacts are not connected or damaged.
• 🔋 The battery is discharged in a few hours. → poor battery or poor plume contact.
• 📱 Phone's off. → Check all the plumes and screws (maybe something shortened the fee).

If you're facing one of these problems, take your phone apart again and check all the connections, and 90 percent of the time, the problem is solved by reconnecting the plumes or changing the screws.

8. Alternative methods: if you do not want to disassemble the phone

Replacing your battery with your own hands is not the only option. If you are unsure of your abilities or are afraid of damaging your phone, consider alternatives:

• 🛠️ The cost of replacing the battery with a Redmi 4X in 2026 - from 1000 to 2500 rubles (including work and spare parts.
• 🔄 If the phone is rarely used, you can connect it to an external battery.
• 📱 Use the power saving mode. In the Redmi settings 4X There is an Ultra Battery Saver mode that disables background processes and prolongs the running time.
• 🔌 More charge your phone. Keep the charge level in range. 20-80% — This will slow down the degradation of the battery.

⚠️ Warning: If you decide to give your phone to the service, make sure it uses original parts. Ask to show the battery before installing it - it should have a holographic sticker with an article on it. BM43 or MBJ416540.

💡 Tip: Before you go to the service, back up your data. Sometimes when you change the battery, you reset your settings or you get a phone error.

FAQ: Answers to Frequent Questions