If your Xiaomi began to discharge quickly, spontaneously turn off when 20-30% And if you're charging or swelling under the back cover, it's time to replace the battery. 2-3 After a year, its capacity falls on 30-50%. The service center will take the replacement from 1500 before 4000 With the tools and patience, you can do it yourself, saving time and money.
In this article, we will go through the whole process in detail, from choosing a compatible battery to calibrating a new battery. POCO (Except for the non-disruptive devices, like the Mi Mix or Black Shark, if you've never taken your phone apart, don't worry, we'll give you tips on how to avoid errors and avoid damaging your device.
1.How to know if Xiaomi battery needs replacement
Before you start screwdriver, make sure that the problem is the battery. Here are the key signs of battery wear:
- 🔋 Phone's running out of power. 3-4 One hour with moderate use (previously kept the day).
- 📉 The percentage of charge "jumps" (for example, with a 40% straight away 15%) or the phone is turned off when 20-30%.
- 🔥 The case is swollen (the back cover is moving away, the screen is “raised”, the phone is staggering on a flat surface).
- ⚡ Charging is slow or interrupted (especially if the cable and power supply are in good condition).
- 🌡️ The phone warms up strongly when charging or working from the battery.
If at least 2-3 The items match, the battery is worn out. For a precise diagnosis, check the battery status through an engineering menu or an application like AccuBattery (showing real capacity in mAh). 10 Pro was standing on the battery. 5020 It's showing you now. 3200 MACh - time to change.
⚠️ Warning: if the body is swelling, do not delay replacement. Lithium-ion batteries in this state can ignite or explode when mechanically exposed (impact, puncture).
It is also worth eliminating software causes of rapid discharge: check the background processes in Settings → Battery, disable unnecessary synchronization and geolocation services. If the problem persists, it's the battery's fault.
2. Selection of a new battery: original vs analogues
The quality of the battery is not only the life of the phone, but also the safety of the phone, and cheap counterfeits can swell, overheat, or even damage the power controller.
| Type of battery | Pluses | Cons | Price (2026) |
|---|---|---|---|
| The original (Xiaomi) | Compatibility guarantee, stable operation, long service life | It is expensive, hard to find (fakes are often sold) | 2500–4500 ₽ |
| Certified analogue (ATL, Sunwoda, Desay) | Quality close to original, cheaper, easy to buy | Maybe a little bit down on the capacitance. | 1200–2500 ₽ |
| No-name (cheap Chinese) | Very low price. | Risk of bloating, low real capacity, short service life | 500–1000 ₽ |
Where to buy:
- 🛒 Xiaomi's official stores (if available).
- 🌍 AliExpress (Look for sellers with a 98 rating%+ and reviews of the original batteries).
- 🔧 Spare parts stores for phones (e.g. FixPriceService, MobiParts).
When choosing, pay attention to:
- 🔍 Phone model (for example, the battery for the Redmi Note 9 Pro is not suitable for the phone). POCO X3 NFC, even if it looks like).
- 📏 Capacity (must match the original, for example, 5020 mAh for Redmi Note 10 Pro).
- 🔋 Type of connector (Xiaomi usually has) JST 1.0 or BM-30).
- 📅 Production date (fresh batteries last longer; optimally - no older than 6 months).
⚠️ Warning: counterfeits are often disguised as originals, copying packaging and stickers. Check the battery for bloating, quality of soldering contacts and weight (the original weighs more than a cheap copy).
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Compare the photo of the original battery (you can find it on iFixit) to what the seller offers before you buy it. Pay attention to the small details: the color of the contacts, the labels, the shape of the connector.
3. Xiaomi battery replacement tools
To disassemble the phone and replace the battery, you will need:
Screen suction cup|Plastic shoulder blades (mediators)|Cross screwdriver (PH00 or PH0)|Tweezers with curved ends|Fryer-dryer|Isopropyl alcohol (90%+)|Double-sided tape or battery glue|Gloves (optional)
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Where to get the tools:
- 🛠️ Ready-made kits for phone repair (cost 300-800) ₽ on AliExpress or electronics stores).
- 🔧 Individual tools (e.g., suction cup - 50) ₽, mediators - 100 ₽ 5 grand).
- 🔥 Dryer can be replaced by household, but it is better to use a building with temperature adjustment (optimally - 60-80).°C).
Prepare the workplace:
- 📱 Work on a flat surface with good lighting.
- 🧲 Remove metal objects (cogs are easily lost).
- 📦 Use a screw container (or stick a tape on paper and sign where each one comes from).
Critical detail: if you have a model with adhesive display (e.g. Xiaomi) 11T or POCO F4), without a hair dryer can not do - a cold method of disassembly can damage the plumes.
4. Step-by-step instructions: how to disassemble Xiaomi and replace the battery
The disassembly process varies from model to model, but the overall pattern is the same. Xiaomi/Redmi/POCO with a removable back cover (for example, Redmi Note) 8 Pro, POCO X3 NFC).
Step 1: Turn off and prepare the phone
Before the disassembly:
- Turn off the phone and remove it. SIM-memory-card.
- If the battery is swollen - do not open the case without protection (wear glasses, gloves).
- Take a picture of the back cover – this will help you to put the antenna tapes correctly.
Step 2: Removal of the back cover
Most Xiaomi models have a back cover on clips and glue to remove it:
- Heat the edges of the phone with a hairdryer (60-80)°C) for 2-3 minutes - this will soften the glue.
- Tap the lid with a plastic spatula or suction cup (start at the bottom edge, where there are usually no plumes).
- Take a good walk around the perimeter, snapping the clips. Don't force it -- if the lid doesn't lend itself, warm it longer.
⚠️ Note: In frameless models (such as the Mi 11), the back cover is often glued to the middle frame. When removed, don't pull it sharply - there may be fragile antenna tapes inside.
Step 3: Shutting off the battery
When you take the lid off, you'll see the battery.
- 🔌 Turn off the battery plume (usually under a black safety tape) and use a plastic shoulder blade to plug the connector.
- 🔧 If the plume is glued - gently dent it, do not pull the wires.
Important: Some models (e.g, POCO F3) have an extra connector NTC-Thermistor (white or red wire next to the main plume) must also be turned off!
Step 4: Remove the old battery
Xiaomi's battery is glued to the body with double-sided tape or glue to remove it:
- Put a plastic blade on the battery from any edge (it is better to start with the top, where there are no plumes).
- If the glue is too strong, drip the isopropyl alcohol under the battery - it will dissolve the glue (do not use acetone!).
- Carefully lift the battery with a spatula. Don't bend it or press it, lithium-ion cells can get damaged.
In some models (such as the Redmi 9), the battery is glued to double-sided tape with stretching ears. Pull over them to separate the battery without alcohol.
Step 5: Installation of a new battery
Before installation:
- 🧹 Clean the place under the battery from glue residues (use alcohol and a napkin).
- 🔍 Check that the new battery has a protective film (if it is not, stick the tape on the contacts to avoid circuits).
Installation:
- Stick the new battery to double-sided scotch (comprised) or a special glue B-7000.
- Connect the battery plume (first the main one, then the main one) NTC-Thermistor, if any).
- Make sure the battery is flat, without any distortion.
Step 6: Build the phone
Collect the phone in reverse order:
- Put the antenna tapes down (if any).
- Secure the back cover by snapping the clips (you can slightly warm up with a hairdryer for better fit).
- Turn the screws (do not pull!).
After assembly, do not turn on the phone immediately - let the glue grab (10-15 minutes).
What if the phone doesn’t turn on after replacement?
Calibration of the new battery
After you change the battery, you need to calibrate it so that the phone displays its charge level correctly.
- Charge your phone to 100% (use the original power supply).
- Turn off the charger and let it discharge to 0% (until the phone turns off).
- Connect the charge and charge again to 100% without interruptions.
- Repeat the cycle 2-3 times.
It is also recommended that:
- 🔄 Reset the battery data in the engineering menu (type in dial ##4636##, select Battery information) → Battery reset).
- 📱 Disable battery optimization for critical applications (in battery settings).
⚠️ Warning: If after calibration the phone still shows an incorrect percentage of charge (for example, drops sharply from 50% to 15%), there may be a problem with the power controller or poor contact of the battery plume.
6. Frequent mistakes and how to avoid them
Even if you change it carefully, you can make mistakes that will cause your phone to fail.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Damage to battery plume | The phone is not switched on or charged | Turn off the plume with a plastic blade, not a metal screwdriver. |
| Battery overheating when soldering | Bloating or ignition | Do not solder the battery - use ready-made plumes |
| Incorrect installation of antenna tapes | Bad signal network, Wi-Fi, GPS | Take pictures of the location of the tapes before disassembly |
| Use of an incompatible battery | Fast discharge, overheating, failure of charging | Check the battery model and capacity before buying |
Other typical problems:
- 🔌 The phone will not charge after replacement → Check the cable, power supply and battery contacts (possibly oxidized).
- 📱 The screen doesn't respond to touch. → Most likely, the display plume was damaged during disassembly.
- 🔋 Battery's running out fast. → Calibrate it or check the background processes.
If after the replacement, the phone began to warm up stronger than usual, this may be a sign:
- 🔥 Incorrect connection of the battery plume.
- 📦 Poor contact between the battery and the body (check if it is flat).
- 🔋 A broken battery (especially if you bought a cheap one).
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If the phone is unstable after replacing the battery (it spontaneously reboots, does not hold a charge), the problem is likely to be a power controller or poor contact, in which case it is better to contact the service.
7. Should I change the battery myself?
Self-replacement of the battery has pros and cons, and let's figure out when to take care of the repair yourself, and when to give the phone to the service.
The advantages of self-replacement:
- 💰 Saving money (in the service take 1500-4000) ₽ work + battery).
- ⏱️ Quick (no need to wait for service).
- 🔧 Experience (useful if you plan to repair equipment in the future).
Cons:
- ⚠️ Risk of damaging the phone (tails, screen, fee).
- 🔋 Warranty (if the phone is warranty, self-repair it cancels).
- 🛠️ Need to buy tools (if they are not available).
When is the best time to contact the service:
- 📱 If you have a model with a complex disassembly (for example, Xiaomi Mi 11 Ultra or Black Shark).
- 🔧 If you have never been to electronics.
- ⚡ If the battery is swelling and there is a risk of damage.
- 📅 If the phone is warranty-free (even if the battery is not covered, disassembly will void the warranty on other components).
If you choose to change your battery, follow the rule: "Slowly and carefully." Most of the breakdowns in self-repair are due to rushing or using inappropriate tools.