Xiaomi Redmi Note 4X
You can replace it yourself in 30-40 minutes.
Many people are afraid to disassemble a smartphone because of the risk of damaging plumes or displays, but in practice, the Redmi Note 4X is one of the most maintainable models of Xiaomi. The main thing is to take your time and follow the instructions. In this article, you will find a step-by-step guide with a photo, a list of necessary tools, tips for choosing a battery and answers to frequent questions.
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 charger?
- 🔋 Smartphone discharges in 2-3 hours with moderate use (social networks, instant messengers).
- 📉 The percentage of charge jumps: for example, from 40% immediately drops to 15% or the phone turns off at 20-30%.
- 🔌 Charging is very slow or interrupted (especially if the cable and power supply are in good working order).
- 🔥 The body near the chamber or lower part warms more than usual.
- ⚡ The phone spontaneously restarts or shuts down even if the battery is 50%+.
If you have 2-3 items on your Redmi Note 4X, it means that the battery is worn out. The average life of lithium-ion batteries is 2-3 years (or 500-800 charge cycles), after that, the capacity drops by 30-50%, and the smartphone does not hold the charge as new.
Before replacing, check the battery status through the engineering menu: ##4636## → Battery information. If your Health score is below 70%, it's time to act.
⚠️ Warning: Don't confuse battery wear with software problems! if phone discharges quickly after upgrade MIUI, First try resetting to factory settings (Settings) → Additionally. → Recovery and discharge).
What battery to choose for the Redmi Note 4X
The original battery for this model is labeled BM47 and has a capacity of 4100 mAh. But the market is full of fakes that will last six months.
| Type of battery | Capacity | Pluses | Cons | Price (2026) |
|---|---|---|---|---|
| Original (Xiaomi BM47) | 4100 mAh | Warranty 6-12 months, exact size, long service life | More expensive than analogues, it is difficult to find in small cities | 1 800–2 500 ₽ |
| Analogue (quality) | 4000-4200 mAh | Cheaper than the original, often with improved capacity | The risk of a fake may not be the size of the | 1 000–1 500 ₽ |
| Increased capacity | 5000–6,000 mAh | Longer holds charge (20–30%) | Thicker than the original - may not fit into the body, wears out faster | 2 000–3 000 ₽ |
Where to buy:
✅ Official stores (Mi Store, Xiaomi Shop) - the guarantee of the original, but the price is higher.
✅ Verified online stores (AliExpress with a seller rating of 98%+, Beru, Wildberries – look for reviews with photos.
❌ Markets and small stalls – high risk of counterfeiting.
Important: the original battery Xiaomi Redmi Note 4X has a holographic sticker with a serial number and QR-If it's not there, you're looking at a fake.
Battery replacement tools
To disassemble the Redmi Note 4X, you will need:
- 🔧 Plastic blades / mediators (2-3 pieces) - for careful tweaking of the body and plumes.
- 🔨 Cross screwdriver (PH00 or PH0) — hull-rotor.
- 🧲 Magnetic mat or container – to avoid losing small details.
- 🔥 Hair dryer or thermoair station - for softening the glue (optional, but simplifies the task).
- 📏 Tweezers - for working with plumes.
- 🛡️ Protective gloves – to avoid leaving prints on the interior.
- 📱 New battery – check its voltage with a multimeter before installation (should be ~3.7–3.8).
If you don't have a hair dryer, you can do without it, but then you have to work with the shoulder blades. Don't use metal tools to tweak the body, they will scratch the plastic and can damage the plumes!
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Before disassembly, take a photo of each stage on the phone - this will help to properly assemble the smartphone back if you forget the location of the parts.
Step-by-step instructions for replacing the battery
Now, to the most critical stage, turn off the phone and remove it. SIM-card with memory card - they can interfere with disassembly.
☑️ Preparation for battery replacement
Step 1: Removing the back cover
The Redmi Note 4X is mounted on latches and glue to remove it.
- Place the phone down on a soft surface (such as a napkin).
- Heat the edge of the body with a hair dryer (especially near the camera and charging connector) for 1-2 minutes. Temperature - 60-70 ° C (not higher, otherwise damage the plastic!).
- Insert a plastic blade into the gap between the body and the screen at the headphone jack and carefully guide it along the edge.
- Repeat the procedure on the opposite side. The lid should move away with a characteristic click.
Don't force it! If the lid doesn't lend itself, warm it up again with a hair dryer.
Step 2: Disconnect the plumes and remove the battery
After removing the cover, you will see:
- 🔋 Battery (stick to the body).
- 📱 Motherboard with connected plumes.
- 📷 Camera and fingerprint sensor.
Act on the algorithm:
- Unscrew 10 screws that fix the metal plate over the plumes (use the PH00 screwdriver).
- Carefully tuck in and disconnect the battery plumes, the display and the fingerprint sensor. Don't pull the wires, just the connectors!
- Put a plastic blade on the battery, and if it's glued heavily, heat it with a hair dryer (maximum 50°C!).
- Remove the old battery and clean the installation site of glue residues (you can use alcohol or a special cleaner).
⚠️ Warning: If the battery is swelling, don't puncture it! Lithium-ion batteries can catch fire if damaged.
Step 3: Installation of a new battery and assembly
Before installing the new battery:
- Check its voltage with a multimeter (should be 3.7-3.85 V).
- Take the protective tape off the contacts.
- Stick the battery onto double-sided tape (comes with a new battery) or use the original glue.
Next:
- Connect the new battery plume to the motherboard.
- Set a metal plate in place and twist the screws.
- Connect the other plumes (display, camera, fingerprint sensor).
- Close the back cover, starting at the bottom (near the charging connector) and it should snap effortlessly.
After assembly, turn on the phone and check:
- 🔋 Charging is stable (the indicator flashes green).
- 📱 The sensor and display work without failure.
- 📷 Camera focuses, fingerprint sensor recognizes finger.
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If the battery is not turned on after the battery is replaced, check the connection of the power plume to the motherboard. 90% of the time, the problem is that it is.
Frequent Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when replacing batteries.
- 🔧 Display plume damage occurs when you pull too hard on the connector. Solution: Use tweezers and only poke on the black plastic tongue.
- 🔥 Overheating the battery with a hair dryer can cause bloating or even fire. Solution: heat for no longer than 2 minutes and at a distance of 5-10 cm.
- 📏 Incorrectly installing the lid, if the latches don't match, there will be gaps. Solution: Start closing the lid on the bottom and press the perimeter evenly.
- 🔋 Using a non-original battery with a different capacity can cause rapid wear and tear or overheating. BM47 or proven analogues with the same capacity.
If the phone is worse off than the old battery after the replacement, chances are you bought a fake battery, and the original battery should last 2-3 years if used properly.
What to do if the new battery does not hold the charge?
How much does it cost to replace a battery in the service
If you are not confident in your abilities, it is better to entrust the replacement to professionals, the cost of the service depends on the region and the status of the service center:
| Type of service | Cost of work (2026) | Pluses | Cons |
|---|---|---|---|
| Official Xiaomi service | 1 500–2 500 ₽ | 6-12 months warranty, original parts | Expensive, long (3-7 days), not in all cities |
| Local service centre | 800–1 500 ₽ | Fast (1-2 hours), often cheaper | Risk of unoriginal parts, no guarantee |
| Private Master (on announcement) | 500–1 000 ₽ | The lowest price, you can arrange for a trip | No guarantee, high risk of poor quality work |
Tips for choosing a service:
- 🔍 Check reviews on Yandex.Maps or 2GIS.
- 📋 Ask if you have a work guarantee and battery.
- 💬 Find out how long it will take to repair (the longest time in official services).
- 🔧 Ask to show the new battery before installation (should be in factory packaging).
If you live in a small town where there are no Xiaomi services, you can order a battery online and give the phone to a local master - so it will be cheaper.
How to prolong the life of a new battery
To make your new battery last longer, follow these rules:
- 🔌 Do not discharge the phone to 0% - optimal charge range: 20-80%.
- 🔥 Avoid overheating – do not leave your smartphone in the sun or near heat sources.
- 📵 Don’t use cheap charging – it can damage the power controller.
- 🔄 Calibrate the battery once every 3 months – fully discharge and charge the phone to 100%.
- 🛌 Do not leave on charging overnight – direct current 100% reduces the service life.
We also recommend disabling unnecessary functions:
- 📡 Continuous search Wi-Fi/Bluetooth (Settings → Wi-Fi → Additionally. → Searching for a network in sleep mode).
- 📍 Geolocation for unnecessary applications (Settings) → Permits → geodata).
- 🔦 Autobrightness of the screen (manual setting saves up to 15% charge).
With these measures, the new battery will last 3-4 years without a noticeable loss of capacity.