Replacement of the battery on Xiaomi Redmi Note 4X: a complete guide with photos and tips

Xiaomi Redmi Note 4X (codenamed mido) remains one of the most popular smartphones in the budget segment even 7 years after its release. However, time does not spare lithium-ion batteries: capacity drops, the phone runs out in a couple of hours, and sometimes even refuses to turn on. If your Redmi 4X began to “hold on the socket” like sinking by a straw, it’s time to think about replacing the battery.

In this article, you will find detailed instructions for replacing the battery, taking into account all the nuances of the model, from choosing a quality battery to properly assembling the case, we will analyze what tools you will need, how to avoid damage to the plumes, and what to do if the phone does not turn on after replacing, and also a list of proven sellers of original and analog batteries from AliExpress and other sites.

And let's warn you right away, it takes care and patience, and if you've never taken a smartphone apart, you might want to go to the service, but if your hands are growing out of the right place and your budget is limited, replacing yourself can save you up to 70 percent of the repair cost in the workshop.

1. Signs that it is time to change the battery

How do you know if the battery is the problem, not the software failure or the board damage?

• ⚡ Fast discharge: the phone sits down in 2-3 hours with moderate use (previously kept the day on).
• 🔋 Sudden shutdowns: the smartphone turns off at 20-30% charge, and after connecting to charging shows 0%.
• 🔥 Overheating: the case is strongly heated in the battery area even without load.
• 🐢 Slow charging: from 0 to 100% in 5-6 hours (with a serviceable power supply).
• 📉 Battery bloating: back cover moves away from screen, display 'lifts».

If any of these signs are visible, check the battery status through an engineering menu or apps like AccuBattery. For the Redmi Note 4X, a drop in capacity below 2000 mAh (the original is 4100 mAh) is critical.

⚠️ Attention: If the battery is swelling, you can't pierce it or try to flatten it. Lithium-ion batteries can ignite or explode if damaged.

2. Which battery to choose for Redmi Note 4X

The original battery for Xiaomi Redmi Note 4X is marked BM47 (or BM48 for some batches) with a capacity of 4100 mAh and a voltage of 3.85V. However, the market is full of fakes that can last for six months.

Where to buy:

• 🛒 AliExpress: Xiaomi official stores or sellers with a rating above 98% (look for reviews with a photo of the installed battery).
• 🏬 Local services: in phone parts stores (ask for a battery certificate).
• 🌍 eBay/Amazon: This is good if you need an original battery with a guarantee.

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Before buying, check that the battery has a sticker with QR-Fresh batteries (2023-2026) will last longer than the rest (2020-2021).

⚠️ Warning: Don’t buy batteries with a capacity above 4200 mAh is a marketing hoax.The actual capacity of such batteries rarely exceeds 3800 mAh, and the Redmi charging controller is a real-life hoax. 4X Not optimized for them.

3. Battery replacement tools

To disassemble the Xiaomi Redmi Note 4X and replace the battery, you will need:

• 🔧 Plastic blades / mediators (2-3 pcs) - to disconnect the cover and plumes.
• ⚒️ The screwdriver (PH00) — hull-rotor.
• 🔥 Dryer or thermo-air station - to soften the glue under the battery.
• 🧲 Suction - will help to lift the lid (optional).
• 📏 Plastic card or guitar mediator – for battery separation.
• 🛠️ Tweezers – to work with small details.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.
• 🔋 New battery - with double-sided tape or glue base.

If you don't have a dryer, you can use hot air from the kettle (carefully!) or put your phone on the heater for 10 to 15 minutes, and the key is not to overheat so as not to damage the display.

⚠️ Warning: Do not use metal tools to tamper with the battery, this can break through the battery body and cause a short circuit. Also avoid acetone or solvents to remove glue: they can damage the plastic parts of the case.

4. Step-by-step instructions for replacing the battery

Now, to the process itself, follow the instructions carefully so that you don't damage the plumes or the motherboard.

Step 1: Turning off and disassembling the phone

1. Turn off the Redmi Note. 4X and extract SIM-memory-card.
2. Heat the hair dryer back cover around the perimeter for 2-3 minutes (temperature - 60-70 ° C).
3. Insert a plastic blade into the gap between the lid and the body (start at the bottom corner where the charging connector is).
4. Carefully drive the blade along the body, disconnecting the latches. The cover should be removed with a characteristic click.

Step 2: Disconnecting the plumes and batteries

1. Unscrew 10 screws with a cross screwdriver (they are of different lengths - remember the location!).
2. Disconnect the plumes: 📱 Battery plume (red connector). 🔊 Dynamic plume. 📷 The camera plume (if disturbing).

80°C

3-5 minutes

Put a plastic card on the battery, starting at the top edge, and move slowly so you don't break the plumes.

Step 3: Installation of a new battery

1. Remove the remnants of old glue from the case (use alcohol and a napkin).
2. Remove the protective film from the new battery and glue it to the old one (align by contacts!).
3. Connect the battery plume to the motherboard.
4. Make sure all the jacks are tightly fixed.

Step 4: Assembly of the phone

1. Place a metal plate (if removed).
2. So, turn all the stains (not to be worn).
3. Connect the plumes in reverse order.
4. Set the back cover starting at the top and snap it around the perimeter.

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After assembly, don't turn the phone on right away! Wait 10-15 minutes for the glue under the battery to "grab" or it may move and damage the plumes.

Possible problems after replacement and their solution

Even if you did everything right, you might have problems after you replace the battery, and here are the most common ways to fix them:

If the battery runs out in a few hours after replacing, try resetting to factory settings (Settings → Additional → Recovery and Reset). Sometimes old energy consumption data interferes with the new battery's proper operation.

⚠️ Warning: If the phone doesn't respond to the power button after assembly, but when you connect to charging, the indicator shows - the problem is in the plug of the power button. It is easy to damage when disassembling, so be careful!

6. How to prolong the life of a new battery

To make the new battery last longer, follow these guidelines:

• 🔌 Avoid full discharge: Charge your phone at 15-20% charge.
• ⚡ Do not use “fast” charging: for Redmi 4X optimum current 1–1.5A.
• 🌡️ Do not overheat your phone: Do not leave it in the sun or near heat sources.
• 📵 Disable unnecessary functions: GPS, Bluetooth and mobile data in the background reduce the time.
• 🔄 Calibrate the battery every 3 months (full discharge/charging cycle).

Also, you should turn off auto-update applications and background activity for unnecessary programs. To do this, go to Settings → Battery → Battery Optimization and select Power Saving mode.

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If you don't use your phone very often, store it with a charge of 40-50%, and a fully charged or discharged battery degrades faster with a long downtime.

7. Alternative ways to solve battery problems

If replacing a battery seems too difficult, try these methods:

• 🔧 Resetting: Sometimes software failures cause increased charge consumption. Make a backup and reset to Settings → Recovery and discharge.
• 📱 Firmware Replacement: Custom firmware (like LineageOS) can better optimize power consumption.
• 🔋 External battery: powerbank for 10000-20000 mAh will help to “hold on” longer without an outlet.
• ⚙️ Disabling unnecessary services: Google Play Services and other background processes put a lot of battery on the ground.Use Greenify to "freeze" them».

If the phone is running out of charge because of a damaged charging connector, it can be replaced by itself, which requires a soldering iron and a new connector (USB Type-C for Redmi 4X), but this procedure is more difficult to replace the battery and requires soldering skills.

Frequently Asked Questions (FAQ)