Xiaomi Redmi Note 4X — One of the brand’s most popular smartphones, launched in 2017, but still in use today for its reliability and maintainability, but even for those centenarians, the main problem eventually arises: the battery loses capacity, quickly discharges or suddenly shuts down. If your device has become able to withstand only a few hours of operation, and charging takes forever - it's time to think about replacing the battery.
In this article, we will discuss in detail how to change the battery on the Redmi Note. 4X (The mido model, without going to the service center, will tell you what tool you need, how to pick up a new battery, avoid disassembly errors and not damage the plumes or board. And we will tell you why you should not buy cheap batteries of unknown brands and how to check the originality of the spare part before installing it.
By following our instructions, you will save up to 3000 RUB (the average amount is taken for replacement in services) and extend the life of your smartphone even more 2-3 But remember, repairs require care and patience, and if you've never taken your phones apart, practice on an unnecessary device or watch video guides before you start.
1. Signs that the Redmi Note battery 4X change
Take your phone apart at the first suspicion, sometimes it's a software setting or a charger, and here are the exact symptoms of a dying battery that require replacement:
- 🔋 The phone's running out of power. 2-3 hours with minimal load (for example, only messengers in the background).
- 🔌 Charging is extremely slow or interrupted (especially if the cable and power supply are serviceable).
- ⚡ The smartphone is turned off when 20-30% charge, and after switching on shows 0% and requires a connection to the network.
- 🌡️ The battery heats up even when used normally (e.g. while making calls or watching videos).
- 📉 In battery settings (Settings) → Battery → Battery condition) capacity shows less than 70% of the original capacity (original capacity Redmi Note). 4X — 4100 mAh).
If at least 2-3 The item on your phone list is probably worn out, but check before you replace it:
- Charger and cable fault (try charging your phone with another set).
- Absence of "gluttonous" applications in the background (see the statistics of the consumption in Settings) → Battery).
- Ambient temperature (at sub-zero temperatures, lithium-ion batteries discharge faster).
2 Which battery to choose for Redmi Note 4X: original vs analogue
The quality of the battery not only determines the life of the phone, but also the safety of the phone, and cheap fakes can swell, overheat, or even ignite, so you have to make the choices responsibly.
| Type of battery | Advantages | Deficiencies | Average price (2026) |
|---|---|---|---|
| Original Xiaomi (Article: MBJ4056) | Guaranteed quality, full compatibility, long service life (500)+ charge-cycle). | High price, difficult to find in small towns, the risk of running into a fake. | 1800-2500 rubles. |
| Licensed analogues (brands: Baseus, Remax, Patona) | Good price/quality ratio, often surpass the original in capacity (up to 4500 mAh). | It may not be a small size, a smaller resource (300-400 cycle). | 1200-1800 rubles. |
| Budgetary Analogues (No-name Brands) | Low price, quick delivery. | High risk of bloating, small capacity (often less than claimed), short service life. | 500-1000 rubles. |
We recommend buying batteries only in trusted stores, such as:
- 🛒 Xiaomi official store (mi.com) or authorized resellers.
- 🛒 AliExpress (sellers rated 98%+ and reviews of the original batteries).
- 🛒 Large marketplaces (Wildberries, Ozon, Yandex Market) with a guarantee of return.
⚠️ Pay attention when buying:
- 📦 Packaging – the original Xiaomi batteries come in a proprietary box with a hologram.
- 🔍 The battery inscriptions must match the original (see photo below).
- 📏 Sizes – even a slight mismatch can cause damage to the body when assembled.
How to distinguish the original Xiaomi battery from a fake?
3. Necessary tools for battery replacement
For the Redmi Note disassembly 4X You will need a replacement battery:
- 🔧 Plastic blade (or mediator) - for careful undermining of the body.
- 🔧 Cross screwdriver (size) PH00 or PH0) — rear-cover.
- 🔧 Suction - helps to remove the cover after heating.
- 🔧 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C).
- 🔧 Tweezers - to detach the plumes.
- 🔧 Double-sided tape or glue B7000 — fixing.
- 🔧 Alcohol and cotton swabs – to clean contacts.
- 🔧 Gloves and glasses – for protection (lithium-ion batteries are dangerous if damaged!).
If you do not have some tools, you can do with the available means:
- Instead of a sucker, there's a stationery tape tape, a cross-stick on the lid.
- Instead of a hair dryer - hot water in a bag (attached to the lid on the 2-3 minute).
- Instead of a plastic shoulder blade, an old bank card.
⚠️ Never use metal tools (knives, screwdrivers) to lid the lid, it is almost guaranteed to damage the plumes or body.°C: This can warp plastic or damage the screen.
Turn off the phone and remove it. SIM-map|Make a backup of the data (in case of damage)|Charge your phone to at least 30% (for safety)|Prepare the workplace (clean desk, good lighting)|Wear gloves and glasses (protection against possible sparks)|Check all the tools for availability-->
4. Step-by-step instructions: how to disassemble the Redmi Note 4X and replace the battery
Now, to the most critical stage, follow the instructions in strict order, without missing steps. If something goes wrong, don't panic, but read the section again.
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the hair dryer around the perimeter during 2-3 The glue will get softer, and the lid will come off easier.
3. Stick the suction cup to the bottom of the phone (near the USB-Type C connector) and pull up. At the same time, pull the lid with a plastic spatula.
4. Carefully walk around the perimeter with a spatula, separating the lid. Be careful at the top - there is a fingerprint scanner plume!
Step 2: Disconnecting the plumes
1 Unscrew 8 screws that fix the metal plate (they are of different lengths - remember where it was!).
2. Remove the plate and disconnect the plumes in this order:
- 🔌 Battery plume (red connector).
- 🔌 Fingerprint scanner plume (orange connector).
- 🔌 Display plume (black connector).
3. Carefully bend the metal clips on the connectors with tweezers - do not pull the plumes!
Step 3: Remove the old battery
1. Put the battery with a plastic blade on the side (where there are no plumes).
2.If the battery is glued strongly, heat it with a hair dryer on the back side (do not direct hot air to the board!).
3. Slowly pull the battery upwards with a spatula. If it swells, don't pierce it! This can cause fire.
Step 4: Installation of a new battery
1. Clear the place under the battery from glue residues with alcohol.
2. glue bilateral tape or apply a thin layer of glue B7000 battery-new.
3. Connect the battery plume to the board and gently put the battery in place.
4. Put her on the top. 10-15 seconds.
Step 5: Assembly of the phone
1. Connect all the plumes in reverse order (first the display, then the fingerprint scanner, then the battery).
2. Install a metal plate and twist the screws (observe order and length!).
3. Stick the back cover. For safety, you can warm it up a little with a hair dryer before you press it.
Correct connection of the battery plume (it should "click" when inserted).
Contacts on the board - they may have become contaminated (wipe with alcohol).
- Charging - connect the phone to the network 10-15 minutes, even if he doesn't respond.-->
5 Possible Mistakes and How to Avoid Them
Even with care, you can make mistakes that will cause your phone to malfunction, and here are the most common problems and ways to solve them:
- 🔴 Phone doesn't turn on after assembly Reason: Unconnected battery or display plume Solution: Take the phone apart and check all the connectors. Make sure the clips are snapped.
- 🔴 The screen doesn't respond to touches Reason: The display plume is damaged or it's not tightly connected Solution: Unplug and reconnect the plume. If it doesn't, check for damage.
- 🔴 Battery discharges quickly after replacement Reason: Bought a fake battery with less capacity or phone not calibrated.Solution: Check capacity through Settings → Battery. If it's less than 4,000 mAh, the battery is poor. Also calibrate: completely discharge the phone, then charge to 100% without interruption.
- 🔴 Phone overheating Cause: Incorrect battery installation (misfit) or damage to the thermal paste on the processor.Solution: Disassemble the phone and check if the battery is flat. Apply a new thermal paste if necessary.
⚠️ Attention! If after the battery change, the phone suddenly turns off, warms up or swells, immediately remove the battery! These are signs of a malfunction that can lead to fire. Do not use such a battery and ask the seller for a replacement.
Calibration of the new battery: why it matters
Many users forget that after replacing the battery, it needs to be properly run-in so that the charge controller can correctly determine the level of charge, and without calibration, the phone can show an incorrect percentage or quickly discharge.
Here's how to do it:
- Full discharge: Use your phone before you turn off automatically (do not plug in to charge even if a low charge warning appears).
- Charging to 100%: Connect your phone to the original charger and charge continuously to 100% full.
- Recycle: Recharge the phone to zero and charge to 100%, which will help the controller to more accurately determine the real capacity.
After calibration, check the phone's operating time if it's significantly lower than expected (e.g., less than expected). 6-8 for a period of time at an average load, possibly:
- 🔋 Battery defective or fake.
- 🔌 The phone remained "gluttonous" applications (check in Settings) → Battery).
- 📱 Software failure (reset settings to factory through Settings) → Additionally. → Recovery and discharge).
💡
Calibration of the battery is mandatory after replacement! Without it, the charge controller may show an incorrect percentage, which will lead to improper operation and shorten the battery life.
7. Alternative methods: replacement of the battery in the service
If you're unsure of your abilities or you're afraid of damaging your phone, you should contact a service center.
- 💰 Cost of work: 1000-2000 rubles (depending on the city and service).
- ⏱️ Replacement time: 30-60 minutes (if battery is available).
- ✅ Advantages: Work warranty (usually 1-3 months), use of original parts (in good services), diagnosis of other possible problems.
- ❌ Disadvantages: Risk of running into unscrupulous masters (may put a fake battery) In some services, they charge a surcharge for "urgentness".
How to choose a reliable service:
- Check the reviews on Yandex.Maps or 2GIS.
- Check if you have a job guarantee and spare parts.
- Ask what battery will be installed (original or analogue).
- Ask if you have a free diagnosis before repair.
Average prices for a replacement battery Redmi Note 4X in services (2026):
| Town | Cost of work (ruble) | Cost of battery (ruble) | Total (rupe) |
|---|---|---|---|
| Moscow | 1500–2000 | 1800–2500 | 3300–4500 |
| St. Petersburg | 1200–1800 | 1600–2200 | 2800–4000 |
| Regions | 800–1500 | 1400–2000 | 2200–3500 |