Replacement of the battery with Xiaomi Redmi Note 4X: Full guide to photo and video

Xiaomi Redmi Note 4X — One of the most popular smartphones of the brand, released in 2017 Despite the reliability of the year, 3-4 When you're in active use, your battery starts to discharge rapidly, swell or shut down in the cold, and if you're on a battery for less than a day, it spontaneously shuts down when you're in the cold. 20-30% Or the back cover crumpled - it's time to replace the battery.

In this article, you will find a step-by-step instruction for replacing the battery with a Redmi Note. 4X (The code name mido, including the choice of original or analogue, the necessary tools and typical errors of beginners, we also will discuss how to check the new battery before installation and what to do if the smartphone does not turn on after replacement. 4X 3/32 GB, 4/64 GB and global version of Redmi Note 4 Global.

We warn you right away: the procedure requires accuracy and basic electronics skills. If you've never disassembled a smartphone, you'd better go to a service center. But if you're willing to take the risk, follow our recommendations to avoid damaging the plumes, the display or the motherboard.

Signs of a faulty battery on the Redmi Note 4X

How do you know if your battery is failing and it's time to change it?

• 🔋 The smartphone is running out of power. 4-6 with moderate use (previously kept) 1-2 day-day).
• 🔌 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
• 🌡️ The phone warms strongly during charging or playing (the battery is swollen and presses on the body).
• ❄️ It is turned off in the cold or at low temperature (even at low temperatures). 30-40% charge).
• 📵 Not activated after full discharge, although the charger is connected.
• 📱 The back cover or screen started to “curve” (a sign of battery bloating).

If you're watching at least 2-3 item from the list, the probability of battery wear is close to 100%. Check the status of the battery through the engineering menu or applications like AccuBattery (showing real capacity and wear). 4X capacitance 4100 mAh, and then 500 charging cycles lose to 30-40% from.

⚠️ Warning: If the battery is swollen, you can't pierce it or try to "flow" the gas - this can lead to a fire or explosion.

What battery to choose for Redmi Note 4X: original?

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

1. Original (from Xiaomi or authorized suppliers) – the most reliable, but expensive (1500-2500 ₽). They have factory markings. BM47 or BM48, capacity 4100 mAh and built-in protection controller.
2. Licensed analogues (e.g. from ZMI, Baseus, Remax - cheaper (800-1200 ₽), But the quality depends on the batch. You'd better choose with Li-Polymer labels and a capacity not lower than that. 4000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.
3. No-name batteries (with AliExpress, markets) are the cheapest (300-600 ₽), They often have a low capacity (really). 2500-3000 mAh) and no overheating protection.

We recommend buying the original or proven analogues from official sellers (for example, in the Mi Store, Messenger or on Wildberries with reviews).

• 🏷️ Marking: Must match the original (BM47 4100mAh 3.85V).
• 📦 Packaging: the original is in a proprietary box with a hologram and QR-code.
• 🔧 Contacts: the battery must have 3 outputs (plus, minus, thermistor).
• 📅 Production date: fresh batteries (2023-2026 d) will last longer.

Before buying, check the reviews of the seller and request a photo of the battery labeled.Fakes often give off a low price (less than 700). ₽) and lack of certificates.

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Before replacing the battery completely discharge the smartphone to automatically shut down – this will reduce the risk of short circuit during dismantling.

Battery replacement tools for the Redmi Note 4X

For a self-replacement, you will need:

• 🔧 Screwdriver kit: cross-haired PH00 flat-shell.
• 📱 Plastic blades/mediators (2-3 (S) - to remove the latches.
• 🔥 Dryer or thermo-air station - to soften the glue under the battery.
• 🧲 Suction - will help to suction the screen (if you need to remove it).
• 🔋 New battery with double-sided tape or glue.
• 🧴 Isopropyl alcohol (90%+) — glue-residue.
• 🛠️ Tweezers – to work with small details.
• 📦 Container for screws - so as not to lose fasteners.

If you do not have a hair dryer, you can use a regular household one, but be careful: do not overheat the body above. 60-70°C, so as not to damage the screen or board. Alternative to the hair dryer - special glue for batteries (for example, B-7000), But it's less reliable.

⚠️ Warning: Do not use metal tools (knives, screwdrivers) to tweak the battery, this can puncture the battery and cause fire. Only plastic blades!

The cost of a full set of tools - about 500-1000 ₽. If you do not plan to repair regularly, you can buy only a screwdriver, shoulder blades and alcohol, and a hairdryer to borrow from friends.

Make a backup copy of the data|Turn off the smartphone and remove SIM-map|Prepare the workplace (clean table, good lighting)|Check the new battery for integrity|Discharge the phone to 0%-->

Step-by-step: how to remove the old battery

Redmi Note's breakdown 4X It starts with the back cover being removed, and unlike modern smartphones, this model doesn't have a battery glued to the lid, it's underneath:

1. Turn off the phone and remove the tray for SIM-Use the factory reset (Settings) → Additionally. → Recovery and reset if you plan to sell the device.
2. Heat the back cover with a hair dryer during 2-3 minutes, keeping him at a distance 5-10 See, it'll soften the glue.
3. Put a plastic blade on the lid, starting at the bottom edge (near the microUSB connector). Be careful, there are plumes under the lid!
4. Disconnect the plumes from the motherboard (they are latched), remember their location or take a picture.
5. Unscrew 10 screws that fix the metal plate over the battery (use a cross screwdriver). PH00).
6. Carefully tuck the battery into a plastic spatula, starting at the top edge. If it's stuck, heat it up again with a hair dryer.
7. Disconnect the battery connector from the board (it's under black insulation).

If the battery is swelling, don't try to take it out by force, it could burst.

1. Stick paint tape to the battery to lock it.
2. Slowly scapula around the perimeter, pouring isopropyl alcohol to dissolve the glue.
3. After removal, immediately pack the old battery into a bag and dispose of it at the hazardous waste point.

At this point, the key is not to damage the flexible plumes of the display and the camera, and if you accidentally cut the contact, it can be soldered, but it requires experience.

Installation of a new battery and assembly of the phone

Before installing the new battery:

• 🧼 Clean the seat from glue residues with alcohol and a napkin.
• 🔍 Check the contacts on the board – they should be clean and not bent.
• 📏 Make sure the new battery is fit for size (length) ~145 mm, width ~70 mm).

Then proceed with the steps:

1. Connect the battery connector to the motherboard. It should snap with a click.
2. Check the polarity: red wire plus (+), black-minus (−).
3. Stick the battery: If you have double-sided tape, stick it on the case, then press the battery. If you don't have tape, use glue. B-7000 (slap).

Install a metal plate

Connect the plumes.

Close the lid.

After assembly:

• ⚡ Don’t turn on your phone right away – let the glue dry. 10-15 minute.
• 🔌 Connect the charger and check if charging is underway (the indicator should burn).
• 📱 Turn on your smartphone and check: Is the charge level displayed correctly, is the sensor, cameras and speakers working, is there overheating (normal to 40)°C when charging).

⚠️ Warning: If the phone doesn't turn on after you've replaced it, check: Is the battery connector properly connected (sometimes it "departs" when you build it), is the display plumes or power buttons damaged, is the contacts on the board closed (look for foreign objects). In 90% of cases, the problem is solved by re-disassembly and checking connections.

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After replacing the battery, perform 2-3 full charge/discharge cycle (from 0% before 100%), calibrate the battery controller.

Common Mistakes When Replacing a Battery and How to Avoid Them

Even the most experienced craftsmen sometimes make mistakes that cause the phone to break down.

Another common problem is the incorrect display of the charge level after replacement (for example, it shows 100%, and after 5 minutes it drops to 20%).

• 🔄 Uncalibrated controller (solved by full charging cycles).
• 🔋 A non-original battery with a different voltage (3.7V instead 3.85V).
• 📱 Failure in firmware (helps reset settings via Recovery).

If the phone is discharged faster than with a new battery after replacing it, check:

• 🔌 Charger quality (use the original Xiaomi unit) 5V/2A).
• 📵 Background apps (turn off auto-start via Settings) → Annexes).
• 🔍 The status of the new battery (maybe you were sold a fake).

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If the battery warms more than usual after replacement, check if the negative contact is closed on the body. This can occur due to improper installation of the metal plate.

What if the phone doesn’t work after the battery is replaced?

If Redmi Note 4X It doesn't turn on after you change the battery, don't panic. 80 percent of the time, it's solved without a service center:

1. Check the battery connector: Take the phone apart and make sure the connector is sitting tight in the socket. Try to move it gently with your finger, sometimes the contact is disrupted due to oxidation.
2. Connect the charger: If the charging indicator is on, the problem is in the power button or the plume. If it is not on, check the battery itself (it may be faulty).
3. Try charging the phone for 30 minutes: The new battery may be completely discharged and not display charge.Use the original Xiaomi cable (low-quality cables may not transmit current).
4. Perform a "forced reboot": Press the power button + louden 10-15 If the phone vibrates, release the buttons and wait for it to turn on.
5. Check plumes and board: Check the motherboard for damage (blackened elements, swollen capacitors). Make sure the display plume and power buttons are connected correctly.

If nothing has worked, the following problems may occur:

• 🔋 Faulty battery – check it on another phone or multimeter (voltage must be 3.7-4.2V).
• 📱 Damaged power controller on the board – requires soldering in the service.
• 🔌 Short circuit – if the charging connection the phone warms up, but does not turn on.

In difficult cases (for example, if the smartphone does not respond to charging and buttons) will help only diagnostics in the service center — 2000-5000 ₽.

How much does it cost to replace the battery in the service?

If you are not sure of your abilities, it is better to entrust the replacement to professionals, the cost of the service depends on the type of battery and the region.

Xiaomi service centers (such as Mi Service) will cost you to replace the original battery. 2500-3500 ₽, But you'll get a guarantee. 6-12 Small workshops are cheaper, but the risk of running into an unskilled craftsman is higher.

Savings can be made if:

• 🛒 Buy the battery yourself (for example, on Wildberries or Ozon with reviews).
• 🔧 Find a master who only charges for the job (about 800) ₽).
• 📱 Use the promotion (some services make discounts on battery replacement).

Before you give the phone for repair, check:

• 📋 Availability of a warranty card for the battery and work.
• 🔧 The experience of the master (ask how many times he changed the batteries on the Redmi Note) 4X).
• 🕒 Time limit (average — 1-2 hour).

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