Replacement of the battery on Xiaomi Redmi 4X: a full analysis with photos and videos

Xiaomi Redmi 4X is one of the most popular budget smartphones of 2017, but even its reliable 4100 mAh accumulator after 5-6 years of operation begins to “set” in half a day, suddenly turn off or inflate. If your device stopped holding the charge, and the original battery is not able to cope, it’s time to replace it. In this article, we will discuss how to do it yourself without going to the service center, saving up to 70% of the cost of repair.

The process of replacing the battery with a Redmi 4X (codenamed santoni) is a medium-sized difficulty: there is no removable back cover like the old Nokia, but no soldering iron or programmer is required. The main thing is to prepare properly, buy a quality battery and follow the instructions. We took into account all the nuances from the choice of tools to testing a new battery after installation.

Note: if your Redmi 4X is swollen in the battery area (the body is deformed, the screen is “stepping away”), do not try to disassemble it at home – the risk of short circuit and fire is extremely high!

1. Signs that the Redmi 4X battery is time to change

How do you distinguish between natural battery wear and software problems? Here are the key symptoms of a dying battery:

• 🔋 The smartphone is running out of power. 2-3 hour with minimal load (messaging, calls).
• 📉 The percentage of charge “jumps”: for example, from 30% immediately drops to 5% or turns off by 20%.
• 🔥 The phone overheats when charging or in idle (especially in the battery area).
• 📱 Redmi Corps 4X It was swelling – there were gaps between the screen and the frame.
• ⚡ Charging is extremely slow or interrupted (even with the original adapter).

If you have at least 2-3 items on your device list, it's probably the battery's fault.

1. Type on the keyboard ##4636##.
2. Select Battery Information.
3. If you look at Battery Health, if it's below 70 percent, you should change the battery.

2.What battery to buy for Redmi 4X: original vs analogues

The original battery for the Redmi 4X is BM47 and has a capacity of 4100 mAh. However, after 2019, Xiaomi officially stopped supplying spare parts for this model, so only analogues remained on the market.

🔹 Expert advice: The best option is a Green Cell or an original used battery with a proven parsing (for example, with Avito or AliExpress from sellers with a rating above 98%). Avoid "nouneime" batteries without labeling - they often have a real capacity 2 times lower than the declared one.

⚠️ Note: If you buy a battery on AliExpress, pay attention to the reviews with photos! Often under the guise of the original sell fakes with a capacity of 2000-2500 mAh, which will last for a month.

3.Redmi 4X battery replacement tools

To disassemble the Redmi 4X, you will need:

• 🔧 Plastic mediators (2-3 (S) for a careful sleeve of the lid.
• 🔨 Cross screwdriver (PH00 or PH0) — hull-rotor.
• 🧲 Magnetic mat or tray – so as not to lose small details.
• 🔥 Hair dryer or thermo-air station - for softening the glue (optional, but simplifies the task).
• 📏 Suction cup – helps to remove the screen if the glue is too strong.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.

💡 Where to buy? Smartphone repair tools will cost between 300 and 500. ₽ If you don't plan on doing regular repairs, you can only take the mediators and the screwdriver, and you can find the rest at home.

Prepare the workplace (clean table, good lighting)

Disconnect the smartphone and remove SIM-map

Charge the battery to 30-50% (for safety)

Prepare tools and a new battery

Take a picture of the process of disassembly (in case of errors)-->

Step-by-step: How to disassemble the Redmi 4X and replace the battery

📌 Important: Turn off your phone before you start and wait until it cools (if you've been in use). Work on a flat surface without carpets or fabrics - a lost cog can shorten the fee!

Step 1: Removing the back cover

The Redmi 4X has a solid metal body, so the lid is held on latches and glue.

1. Heat the hair dryer edge of the body (temperature 60-70 ° C, not higher!).
2. Insert the plastic mediator into the gap between the screen and the frame (start at the bottom edge where the charging connector is).
3. Carefully drive the mediator around the perimeter, snapping the clamps. Don't force it, if the lid doesn't respond, warm it up again.

Step 2: Turn off the plumes

After removing the cover, you will see:

• 🔋 Battery (stick to the body).
• 📶 Antenna modules (do not touch!).
• 🔌 Camera plumes, speakers and power buttons.

First thing you do is turn off the battery connector (it's black insulated).

1. Put a plastic spatula on the connector.
2. Take care to pull up (not to the side!).

⚠️ Warning: If you skip this step and start to unfurl the battery with the plug in, short circuit is guaranteed.

Step 3: Remove the old battery

The battery in the Redmi 4X is glued to double-sided tape to remove it.

1. Pick up the battery from any corner with a plastic spatula.
2. Pull slowly with the glue. If the battery doesn't go, moisten the glue with isopropyl alcohol (don't overdo it!).
3. Recycle your old battery according to your region’s rules (don’t throw it away in the trash!).

Step 4: Installation of a new battery

Before installing the new battery:

1. Clean the landing site of glue residues with alcohol.
2. Remove the protective film from the contacts of the new battery.
3. Stick bilateral tape (comes with battery) or use the original glue.
4. Connect the battery connector to the motherboard.

🔹 Check: Connect the charger and make sure the phone starts charging. If not, check the contact density of the connector.

Step 5: Assembly of the phone

Collect the phone in reverse order:

1. Put the plumes in their places.
2. Close the lid starting at the top (where the camera is).
3. Tighten the screws (do not pull!).

Do the volume and power buttons work?

Are there any sensor glitches (check the multi-touch)

— Is the charge level correctly displayed?-->

5. Calibration of the new battery: why it matters

Once the battery is replaced, it needs to be calibrated so that the power controller can correctly determine the level of charge, otherwise you can see "jumping" percentages or sudden blackouts.

1. Full discharge: Use your phone before automatically shutting down (0%).
2. Charging up to 100%: Connect the original RAM and wait for full charging (don’t interrupt the process!).
3. Recycle: Discharge to 0% and recharge to 100%.

📊 Tip: Repeat the cycle 2-3 times, then the controller will learn how to display the charge correctly. Also install the AccuBattery app (available on Google Play) to track the health of the new battery.

6. Frequent battery replacement errors and how to avoid them

Even experienced users sometimes make mistakes that cause their phones to break down.

• ❌ Use of metal tools → risk of short circuit or damage to plumes Solution: plastic or wooden sticks only.
• ❌ Hydrogen overheating → Solution: heat for no more than 30 seconds in one area.
• ❌ Installation of the battery without checking contacts → Solution: Before assembly, check the multimeter voltage at the terminals (should be 3.7-4.2 V).
• ❌ Ignoring bloating → Solution: if the battery is even slightly swelling, it needs to be replaced urgently.

🔧 Emergency: If the phone doesn't turn on after the replacement, check:

• Is the battery connector connected to the motherboard?
• Are the power button plumes damaged?
• Are there any contacts closed (call the multimeter).

💡

If you've changed the battery, the phone stops charging, 90 percent of the time, the problem is the oxidized contacts on the connector, clean them with alcohol and eraser, and then reconnect.

7.The cost of replacing the Redmi 4X battery in the service vs independently

Prices for battery replacement in 2026:

💰 Conclusion: If you're confident in your abilities, self-replacement will cost 3-5 times less than in the service.

FAQ: Answers to Frequent Questions