How to replace the battery in the smartphone Xiaomi: detailed instructions with photos and videos

Xiaomi smartphones are known for their value for money, but even the most reliable models face the problem of battery wear over time, POCO X3 Or Mi 11 started to run out in a few hours, turn off in the cold or the body swelled up — it's time to think about replacing the battery. In the service center for this procedure will take from 1,500 to 4000 rubles, but with the tools and patience you can save by doing the replacement yourself.

In this article, we will take a look at the whole process from choosing a new battery to building a phone, take into account the nuances for different Xiaomi models, and warn against typical errors. Importantly, if you have never disassembled electronics, practice on an old device or consult a specialist, the wrong actions can lead to damage to the motherboard or fire danger.

Modern Xiaomi smartphones are equipped with lithium polymer batteries that lose up to 20% of capacity after 500 charging cycles. When used actively, this happens in 1.5-2 years. The manufacturer does not recommend a self-replacement, as this is not warranty, but for devices older than 2-3 years, this is often the only economically viable option.

Before you start, answer three questions:

1. Are you willing to risk your device for the sake of saving money?
2. Do you have the right tools (see section below)?
3. Can you work with small parts and adhesives?

If the answer to at least one question is “no”, it is better to entrust the replacement to professionals.

1.How do I know if the battery needs to be replaced?

Not all battery problems are obvious. Sometimes the phone just runs out quickly due to background processes or a worn-out charger. Before disassembling the case, check for these signs of critical battery wear:

✅ Battery life has been reduced by 2-3 times compared to the new device, for example, if the Redmi 9 used to hold a charge for a day, and now it is 4-5 hours with the same use.

✅ The phone turns off at 20 to 30 percent charge or shows a "jump" percentage (50 percent, then 1%) This is a sign of degradation of the battery controller.

✅ The case is swollen or there are gaps between the screen and the frame. Xiaomi batteries (and other brands) swell over time due to chemical reactions. If the case is deformed, the replacement should be done as soon as possible: a bloated battery can damage the screen or motherboard.

✅ The device overheats while charging or refuses to charge to 100%. Modern smartphones limit charge at high temperatures, but if it happens constantly - the battery is to blame.

✅ Apps like AccuBattery show wear and tear over 50 percent, and it analyzes the actual capacity of the battery and compares it to the factory capacity. ±10%, but if the wear exceeds 60%, it is time to change the battery.

⚠️ Note: if the Xiaomi phone does not turn on after falling or getting moisture, the problem may not be in the battery, but in the power contacts or chips!

For accurate diagnosis, use the service code:

##4636##

In the Battery Information menu, check Health Level. If it's below 70%, replacement is required.

2. Selection of a new battery: original vs analogues

The quality of the battery not only affects the life of the phone, but also its safety, and cheap fakes can swell in a month or even ignite when charging.

🔋 Original Xiaomi batteries

• 🔸 Cons: high price (from 2000 to 5 000 rubles), it is difficult to find for old models.

🔋 Analogues from proven manufacturers (Baseus, Remax, Patona)

🔋 Cheap Chinese counterparts (without brand)

• 🔹 Pros: price from 300-500 rubles.
• 🔸 Cons: high risk of bloating, mismatch of declared capacity, lack of protection from overheating.
• 🔶 Conclusion: not recommended for purchase, even for older models.

When choosing, pay attention to:

1. Battery model: must match the original (e.g, BM43 For the Redmi Note 8 Pro).

⚠️ Note: If you buy a battery on AliExpress, check the seller’s rating (at least 98%) and the number of orders (from 100)+). Often under the guise of original batteries sell fakes with glued stickers.

💡

Compare the photo of the original battery (can be found at gsmarena.com) to the seller's offer before buying it. Pay attention to the location of the contacts and labels - they should be completely identical.

Battery replacement tools

You'll need a specialized tool to disassemble a Xiaomi smartphone, and don't try to do it with a knife or a screwdriver, which will damage the plumes or scratch the body.

🛠️ Basic instruments

• 🔧 Plastic blades (poodgers) - for disconnecting adhesive joints.
• 🔧 Setting screwdrivers PH00, T3, T5 — screws of different sizes.
• 🔧 Screen suction cup - helps to undercut the front panel.
• 🔧 Tweezers with curved ends - for working with small plumes.

🔥 Additional accessories (recommended)

• 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
• 🔥 Isopropyl alcohol (90%+) — glue-cleaner.
• 🔥 Double-sided tape or glue B-7000 — fixing.
• 🔥 Multimeter – to check the voltage of the battery (must be 3.7-4.2 V).

📦 Where to buy tools?

• 🛒 Kits for repairing smartphones on AliExpress (from 500 rubles).
• 🛒 Radio parts stores (Chip and Deep, Amperca).
• 🛒 Ozone or Wildberries (search for battery replacement kit»).

If you do not plan to repair regularly, you can rent tools in service centers or workshops (cost – 200-500 rubles / day).

Turn off the phone and remove it. SIM-map|Cover the table with a soft cloth (so as not to scratch the screen)|Prepare a container for screws (such as a magnetic mat)|Charge the new battery to 30-50% before installation-->

Step-by-step instructions for replacing the battery

The disassembly process is different for different Xiaomi models, but the overall scheme is the same. We will look at the universal algorithm using the example of the Redmi Note 9 Pro, POCO F3 or Mi 10T) Additional steps may be required, and we will specify them separately.

📌 Step 1: Turn off and prepare the phone

• 🔌 Turn off your smartphone completely (clip the power supply). + Volume up for 10 seconds).
• 🔌 Remove the tray for SIM-map.
• 🔌 Heat the back cover with a hair dryer for 2-3 minutes (keep 10 cm away so as not to overheat).

📌 Step 2: Removal of the back cover

• 🧲 Suction the lid near the charging connector.
• 🪛 Insert a plastic spatula into the resulting gap and carefully lead along the body.
• ⚠️ Do not use force - if the lid does not lend itself, warm up the glue again.

📌 Step 3: Disconnect the plumes and batteries

• ⚡ Unscrew the screws that fix the metal plate over the battery.
• ⚡ Disconnect the battery plume (use a plastic spatula to avoid damaging the contacts).
• ⚡ Check the voltage with a multimeter – if it is below 3V, the battery may be faulty.

📌 Step 4: Remove the old battery

• 🔥 Put a plastic card or a spatula on the battery, and be careful, it's glued to the case!
• 🔥 If the battery is swelling, do not pierce it - it can lead to fire.
• 🔥 Remove glue residues with alcohol or acetone.

📌 Step 5: Installation of a new battery

• 🆕 Stick bilateral tape to the place of the old battery.
• 🆕 Connect the new battery plume (make sure the contacts match).
• 🆕 Secure the metal plate with screws.

📌 Step 6: Build the phone

• 🔧 Put your shoes in your seats (don’t overstep them!).
• 🔧 Stick the back cover (use glue) B-7000 origen).
• 🔧 Tighten the screws cross-cross to avoid distortions.

🎥 Video Instructions for Popular Models:

• Redmi Note 10 Pro: YouTube link
• POCO X3 NFC: YouTubelink
• Mi 11 Lite: YouTube link

⚠️ Warning: On models with an amoleed screen (such as the Xiaomi 12), the display plume is very fragile!

5. Features of replacement for different Xiaomi models

The design of Xiaomi smartphones varies depending on the series. Let’s consider the key nuances:

📱 Redmi Note series (Note) 8/9/10/11)

📱 Series POCO (X3, X4, F3, F4)

📱 Flagship models (Mi) 10/11/12, Xiaomi 13)

• 🔹 The body is often glued to liquid glue, which is difficult to remove without a hair dryer.

📱 Budget models (Redmi) 9/9A/9C, POCO M3)

• 🔹 The easiest to disassemble - the battery is attached to ordinary Scotch.
• 🔹 At Redmi. 9A No metal plate over the battery – be careful with contacts.
• 🔹 Cheap models often have weak protection from moisture – check the tightness after replacement.

💡

Before disassembling flagship models (Mi 11, Xiaomi 12), be sure to watch the video disassembly of your modification - the location of the plumes may differ even within the same series!

Calibration of the new battery

After the battery is replaced, the phone may not display the charge level correctly (for example, a jump from 50% to 1% per second).This occurs due to a mismatch between the battery controller and the system.

🔋 Method 1: Software calibration (for all models)

• 📱 Charge your phone to 100% and keep charging for another 1-2 hours.
• 📱 Turn off the charger and use the phone until it is fully discharged (until it turns off).
• 📱 Repeat the charging-discharge cycle 2-3 times.

🔋 Method 2: Resetting battery data (requires root or ADB)

• 📱 Connect your phone to your PC and execute the command: adb shell dumpsys battery reset
• 📱 Reset the device.
• 📱 Check the charge level in Settings → Battery status.

🔋 Method 3: Use of an engineering menu (for advanced users)

• 📱 Enter the code ##4636## and go to Battery Information.
• 📱 Click Clear Statistics (if option is available).
• 📱 Perform a full charge-discharge cycle.

If the phone still shows an incorrect charge after calibration, the problem may be:

1. A battery without the right controller.
2. Damaged battery plume (check contacts).
3. Failure in the firmware (try to reset the settings to factory).

💡

If after replacement the battery discharges too quickly, check the background processes in Settings → Battery → Battery use. Apps like Facebook or TikTok are often to blame, which consume even in the background.

7.Typical mistakes and how to avoid them

Even experienced tycoons sometimes make mistakes when replacing a battery, and we've collected some of the most common mistakes and ways to prevent them:

❌ Mistake 1: Using metal tools to tamper with batteries

• 🔧 Consequences: battery puncture, short circuit, fire.
• 🔧 Solution: Use only plastic shoulder blades or special battery fixtures.

❌ Mistake 2: Incorrectly shutting off the battery plume

• 🔌 Consequences: damage to the power controller, phone not switched on.
• 🔌 Solution: Always disconnect the plume with a plastic blade, not with your fingers.

❌ Mistake 3: Overheating of the body with a hairdryer

• 🔥 Consequences: melting plastic parts, damage to screen or camera.
• 🔥 Solution: Keep the hair dryer at a distance of 10-15 cm, the temperature is not higher than 80°C.

❌ Error 4: Installation of the battery without calibration

• 📉 Consequences: the phone shows the wrong percentage of charge, quickly discharges.
• 📉 Solution: Perform 3 full charge-discharge cycles after replacement.

❌ Mistake 5: Loss of screws or improper assembly

• 🪛 Consequences: backlashes of the body, damage to plumes, broken buttons.
• 🪛 Solution: Use a magnetic screw mat and take photos of the disassembly process.

⚠️ Warning: If after the replacement the phone starts to overheat or turn off on its own, immediately remove the battery.

8. Alternatives to self-replacement

If you are unsure of your abilities or are afraid of damaging your phone, consider alternative options:

🔧 Official Xiaomi Service Center

🔧 Informal service centres

• ❌ Cons: the risk of installing a non-original battery, there is no guarantee.

🔧 Trade-in substitution

• 💰 It is profitable if your Xiaomi is older than 3 years and repairs will cost more than 3 000 rubles.

🔧 Buying a used battery

• 🔋 You can find on Avito or Yula for 500-1 500 rubles, but the risk of getting a “donor” battery with wear and tear of 50 rubles%+ high-pitched.
• 🔋 Before buying, ask the seller to show charging cycles in AccuBattery.

📌 Comparative table of options: