Replacement of the battery with Xiaomi Redmi Note 4X: detailed instructions with photos and nuances

Why Change the Battery on the Redmi Note 4X and when it's necessary to do it

Xiaomi Redmi Note Smartphone 4X (codename mido) came out in 2017 year and even through 7 It's still popular because of its robust stuffing and upgrade capability, but no battery lasts forever, and lithium-ion batteries are lost to the scaling up of the battery. 20-30% post-container 500 If you have your Redmi Note, 4X It is discharged in a couple of hours, it is turned off when 30-40% When you are overheated or charged, it is time to think about replacing.

Typical signs of a “dying” battery:

• 🔋 Sudden shutdowns at charge level above 15%
• ⚡ Slow charging (longer) 3 hourly 100%) or hanging on 80-90%
• 🌡️ Strong heating of the body in the battery area
• 📉 A sharp drop in the percentage of charge (for example, from 50% to 10% in 10 minutes)
• 🔌 Refusing to charge for no apparent reason (check the cable and power supply first!)

Should you change the battery yourself? If you have experience disassembling the equipment or are willing to act carefully - yes. 4X (articular BM47) worth 800-1200 RUB, and in the service for replacement will take more 1000-1500 Self-substitution will save half the budget, but will require patience and the right tools.

Which battery to replace: original vs analogues

There are three types of batteries for the Redmi Note 4X:

1. Original (BM47, 4100 mAh capacity – manufactured by Xiaomi or partners (e.g. Desay) and compatible with the power controller, but often forged.
2. Licensed analogues (Baseus, Remax, Patrona brands) – cheaper on the market 20-30%, But they may have a smaller resource (300-400 cycle 500-600).
3. No-name (without brand) – a risky option: capacity is often underestimated (3500-3800 mAh instead of the stated 4100), a) the power controller may conflict with the motherboard.

How do you tell the original? Notice that:

• 🏷️ Hologram on the package with QR-code (can be checked through the Mi Verify app)
• 🔍 Marking: the original must have the Mi logo, article BM47, production date and serial number
• ⚖️ Weight: The original battery weighs ~85 gram (forgery is easier on the 10-15 gram)
• 🔌 Contacts: original 4 contacts (2 for power, 2 for thermistor), cheap analogues can be 3

⚠️ WARNING: If you buy a battery on AliExpress or an unknown online store, check the reviews with the photo! Often sellers send batteries from Redmi Note 4 (without the letter X), which look similar but have a different capacity (4000 mAh) and may not fit the connector.

Preparing for replacement: security tools and measures

To disassemble the Redmi Note 4X, you will need:

Purchase a new battery (proven by the manufacturer)

Buy or borrow a set of tools (plastic blades, tweezers, screwdrivers)

Prepare the workplace (clean table, good lighting)

Backup of data (in case of unforeseen problems)

Charge your smartphone to 30-50% (to avoid short circuits)

Turn off the phone and remove it. SIM-memory-card-->

Tool list:

• 🔧 Plastic blades (2-3 (p) or mediator for disengaging the shell
• ⚙️ Cross screwdriver (PH00 or PH0 rear-cover)
• 🧲 Magnetic mat or screw box (so as not to lose)
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 🧴 Isopropyl alcohol (90%+) clean-up
• 📏 Plastic scraper (for careful tweaking of the battery)

Security measures:

1. Work on a non-conductive surface (wooden table, rubber mat).
2. Do not use metal tools to tamper with the battery - the risk of puncture!
3. If the battery is swelling, don't prick it. There's an electrolyte inside, which ignites when it comes into contact with air.
4. Do not turn on the phone with the battery disconnected – this can damage the power controller.

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Before disassembling, take a photo of each step on a friend's phone or tablet, which will help to properly assemble the smartphone back, especially if you are doing repairs for the first time.

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

The replacement process will take 30-60 Follow the instructions carefully:

Step 1: Removing the back cover

1. Turn off the phone and remove the tray for SIM-map.

2. Heat the edge of the back cover with a hair dryer (temperature) ~60°C) during 1-2 minutes to soften the glue.

3. Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is located). Carefully drive the blade along the perimeter, separating the latches.

4. Remove the cover. Be careful, because it has fingerprint scanner and antenna contacts.

Step 2: Disconnecting the plumes and removing the motherboard

1 Unscrew 10 screws (marked in the photo below) with a cross screwdriver. Rotors of different lengths - remember which ones were standing!

2. Unplug the plumes:

• 📱 Display (at the top of the board)
• 🔊 Dynamics and microphone (bottom)
• 📡 Antenna contacts (sides)

3. Carefully tuck the motherboard and put it aside. Don't pull the plumes!

Step 3: Remove the old battery

1. Battery glued to the body. Push it with a plastic blade from any edge and slowly pull up (not on yourself!). If the glue is too strong, heat the battery with a hair dryer (maximum 70).°C!).

2.Do not use metal tools - the risk of puncturing the battery and causing fire.

3. After removal, clean the body of glue residues with isopropyl alcohol.

Step 4: Installation of a new battery

1. Check the contacts of the new battery – they must match the old ones (4 pin: +, –, BAT_TMP, BAT_ID).

2. glue bilateral tape (comes complete with battery) or apply a thin layer of glue B-7000.

3. Connect the battery plume to the motherboard and gently put it in place.

Step 5: Assembly of the phone

1. Set the motherboard back and spin the screws (starting with the long ones!).

2. Connect all the plumes (make sure the latches are fixed!).

3. Stick the back cover. To be reliable, warm up the edges with a hair dryer and press on the back. 1-2 minute.

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Don't turn on the phone right after assembly! 10-15 Just take a minute to get the glue, and then test it.

Calibration of the new battery and check of performance

After the replacement of the Redmi Note battery 4X It can show a wrong charge level. It's normal -- the power controller needs to be trained:

1. Charge your phone to 100% (use the original power supply!).
2. Turn off charging and use your smartphone until it is automatically turned off (do not turn it on until it is completely discharged!).
3. Connect charging and charge up to 100% without interrupting the process (even if the phone turns on earlier).
4. Repeat the charging-discharge cycles 2-3 once.

Check the operability:

• 🔋 Charging time to 100% (should be reduced to 1.5-2 hours)
• 🌡️ Body temperature (must not exceed 40)°C when charging)
• ⚡ Stability of charge level (no sudden jumps)
• 📊 Autonomous operation time (with active use - at least 4-5 hours)

If the phone is not turned on after replacement:

1. Check the connection of the battery plume to the motherboard.
2. Make sure your contacts are not contaminated (wipe with alcohol).
3. Put the charger on. 10-15 Minutes – sometimes the controller needs time to initialize.
4. If it does not help, it is possible that the power controller is damaged (diagnosis is required in the service).

⚠️ Warning: If the battery swells, warms up, or the phone turns off at 50% charge, you probably installed a defective battery!

Frequent Battery Replacement Mistakes and How to Avoid Them

Even the most experienced craftsmen make mistakes sometimes, and here are the most common ones:

A few more nuances:

• 🔧 Do not pull the screws - this can damage the thread in the case.
• 🧴 Do not use superglue to lock the battery – it conducts current and can cause a circuit.
• 📱 Don’t turn on your phone without a battery – it could burn the power controller.
• 🔋 Don’t buy batteries with AliExpress without checking reviews – 70% of the originals are fake.

Alternative ways to extend the life of the battery (if replacement is not an option)

If you are not ready to change the battery yourself, but want to extend its operation, try these methods:

Program settings:

• 📵 Turn off Auto Brightness and set the brightness to 50-60%.
• 🔄 Reduce screen timeout to 15-30 seconds (Settings) → Screen).
• 📴 Enable Power Saving Mode (Settings) → Battery).
• 🚫 Turn off background activity for unnecessary applications.
• 📶 Switch to the switch. 2G/3G instead 4G, If the speed of the Internet is not critical.

Hardware solutions:

• 🔌 Use a quality power supply unit (5V/2A). Cheap charging ruins the battery.
• 🌡️ Avoid overheating (do not leave your phone in the sun, do not play heavy games while charging).
• 🔋 Every 3 months, do a full discharge-charging cycle to calibrate the controller.
• 📵 Turn off Wi-Fi, Bluetooth and GPS, when they're not needed.

If the battery is swelling:

• ❌ Don't stab her! It could lead to a fire.
• ⚠️ Do not charge your phone – the risk of fire increases.
• 🔧 Contact the service or replace the battery as soon as possible.

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If the phone is turned off when 20-30% It's a charge, but it's normal after the reboot, and it's not the battery, it's the power controller on the motherboard, and it's not going to help if you change the battery, you need to repair the board.

FAQ: Frequent questions about replacing the Redmi Note battery 4X