Replacing the battery on a Xiaomi smartphone is one of the most popular procedures among owners of devices older than 2-3 years. Even the most reliable models like the Redmi Note 10 Pro or Mi 11 eventually begin to hold a charge for only a few hours, and the device suddenly turns off at 20-30% charge. The reason is almost always the same: the degradation of lithium-ion cells. In the service center for such work will take from 1500 to 4000 rubles, but with the tools and accuracy you can cope with it yourself.
This guide will be suitable for most Xiaomi, Redmi and POCO models of the last 5 years, from the budget Redmi 9A to flagships like Xiaomi 13 Ultra. We will analyze not only the mechanical part (how to remove the lid and disconnect the plumes), but also the critical nuances: choosing the original battery, the correct calibration after replacement and diagnosing possible errors. And you will learn why some models after replacing the battery require flashing the power controller – this applies to devices on the Qualcomm Snapdragon 8 Gen 1/2 platform.
Signs that it is time to change the battery
Take your phone apart if it's just running out faster, sometimes software failures or apps' background power consumption are the problem, and here are the exact symptoms that indicate that the battery is wearing out:
- 🔋 The smartphone is turned off when 15-30% although it had previously been used before 1-5%. This is a sign of severe capacitance degradation - the power controller is deceived by voltage readings.
- 🔥 The body is heated noticeably in the battery area even with minimal load (for example, during a bell.
- ⚡ Charging jumps: then 100%, piece 80% It's a symptom that's common on fast-charging models (33W/67W/120W).
- ⏳ The Autonomous Work Time has been reduced in 2-3 compared to the new device (for example, instead of 8 Time of the day, all of the screen time. 2-3).
If at least two of these signs match, the battery definitely needs to be replaced, but before disassembling, check the status of the battery programmatically:
- Install the AccuBattery app (available on Google Play).
- Charge the phone to 100% and use it to full discharge (before turning it off).
- In the Health section, the application will show the real capacity in mAh. If it is less than 70% of the factory battery, it is time to change.
⚠️ Note: On some Xiaomi models (e.g, POCO F3 or Redmi K40) The app may be underestimated because of the power controller, so focus on the physical symptoms.
Selection of a new battery: original vs analogues
The quality of the battery is not only the time of operation, but also the safety of the device, and cheap fakes can swell in a month or even ignite.
| Type of battery | Pluses | Cons | Price (rupe) |
|---|---|---|---|
| Original (Xiaomi) | Compatibility guarantee, correct charging parameters, long service life | High price, difficult to distinguish from counterfeit | 1800–4500 |
| Licensed analogues (ATL, Sunwoda) | Quality close to the original, often the same manufacturing plants | The capacity may differ slightly (by 50-100 mAh) | 1200–2800 |
| Budgetary analogues (without brand) | Low price, fast delivery | Risk of bloating, short service life, possible charging problems | 600–1500 |
How to check the originality of the battery when buying:
- 🏷️ The label should have a serial number, barcode and logo. Xiaomi/Redmi/POCO.
- 🔍 Check the production date (not older than 6 months) and the batteries don't store the charge well if they're in storage for years.
- 📦 The packaging must be airtight, with protective stickers. Originals are often supplied in vacuum bags.
- 🛡️ Buy only from trusted sellers (e.g. AliExpress Official Store, Beru, Connected Store, and other vendors).
For models with fast charging (33W and above), be sure to take a battery with support for the corresponding protocol. For example, for Xiaomi 12T Pro (120W), only a battery labeled MBJ4065 or similar from Sunwoda will suit.
Replacement tools: what you will need
Without the right tools, you risk damaging plumes, the case, or even the battery itself.
- 🔧 Plastic blades (2-3 - for gently putting the lid on and detaching the plumes. Metal mediators can scratch the body.
- 🔨 Set of screwdrivers (cross-haul) PH00, flat 1.5 mm, five-pointed Y00 for some).
- 🧲 Magnetic mat or screw tray – so as not to lose small details.
- 🔥 Hair dryer or thermoair station - for softening the glue (not always necessary, but will help on models with strong fixation).
- 📱 Suction - to remove the display module (relevant for models with a glass back panel, for example, Xiaomi Mi 11).
- 🔋 Isolating tape or capton – to protect contacts after replacement.
For models with a waterproof body (for example, Redmi Note 11 Pro+ 5G or Xiaomi 13) additionally require:
- 🩹 Sealer (e.g. sealant, LOCTITE 577) - to restore protection against moisture.
- 🧴 Alcohol or contact cleaner – to remove old glue.
⚠️ Note: If you have an aluminum body (for example, POCO X3 Pro, be careful when heating with a hair dryer - the metal quickly transfers heat to the internal components!
☑️ Preparation for battery replacement
Step-by-step: how to disassemble the phone and replace the battery
The disassembly process varies from model to model, but the overall scheme is the same. We will look at the universal algorithm using the example of the Redmi Note 10 Pro (similar to most Xiaomi devices).
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. Heat the hair dryer edges of the rear panel (a temperature of ~60°C) for 1-2 minutes. This will soften the glue.
3. Insert the plastic blade into the gap between the lid and the housing (start at the lower corner where the charging connector is located).
4 Carefully swipe the perimeter, separating the lid. If you feel resistance, warm up the place again.
Step 2: Disconnecting the plumes and batteries
1 Unscrew all screws that fix the metal plate above the battery (usually 4-6 pieces).
2. Unplug the battery plume with a plastic blade. Don't pull the wires!
3 If the battery is glued, put it on the side and pull on the ears (if any) and in some models, the glue will have to be softened with alcohol or a hair dryer.
Step 3: Installation of a new battery
1. Check that the contacts of the new battery coincide with the connector on the board.
2. Stick the battery to double-sided tape (usually included). Don't use superglue!
3. Connect the plume and fix it with a metal plate.
Step 4: Assembly of the phone
1. Make sure all plumes are connected correctly (especially the display and cameras).
2. Stick the back cover. For waterproof models, apply a perimeter sealant.
3. Twirl the screws (do not pull!).
After assembly, do not turn on the phone immediately - let the glue dry (10-15 minutes).
What to do if the battery is too tight?
Calibration of the battery after replacement
The new battery may be showing an incorrect percentage of charge or quickly discharged in the early days, because the power controller doesn't "know" the actual capacity.
- Charge your phone to 100% and keep charging for another 1-2 hours.
- Turn off charging and use the phone until it is completely discharged (until it turns off).
- Connect the charging and charge up to 100% without interruptions.
- Repeat the cycle 2-3 times.
For models on Qualcomm Snapdragon 8 Gen 1/2 (for example, Xiaomi 12/13 series), you may need to reset the data of the power controller.
#4636## → Battery → Reset statisticsIf the phone doesn’t turn on after the replacement or shows a charging error, check:
- 🔌 Is the battery plume connected correctly (sometimes it is inserted "upside down»).
- 🔧 Have you damaged the contacts on the board during the disassembly.
- 📱 Is the new battery compatible with your model (for example, the Note 10 battery will not work for the Redmi Note 11, even if they look similar in appearance).
💡
If the battery is discharged quickly after replacing, check the background consumption in the settings: Settings → Battery → Battery use. Sometimes faulty applications are to blame, not the battery itself.
Frequent Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when replacing batteries, and here are the most common problems and solutions.
| Problem. | Reason. | Decision |
|---|---|---|
| The phone will not turn on after assembly. | The battery or display plume is disconnected | Disassemble the phone and check all connections |
| Battery discharges quickly (less than 50% of the declared capacity) | Forgery or marriage, miscalibration | Check the battery with a tester or replace it with another. |
| The phone overheats when charging | Incompatible battery or damaged power controller | Use only the original battery, check the fee |
| Charging is slow (for example, 1% in 10 minutes) | Damaged plume or contacts, faulty power supply | Try another charger, check the plume |
Pay special attention to dual-battery models (e.g. Xiaomi 11T Pro or Redmi K50 Gaming) where two cells are connected in series, and if you replace only one, you may experience a voltage imbalance.
⚠️ Note: Some Xiaomi models (such as the Mi Mix 3 or Black Shark 4) may have battery protection that is not original after the battery is replaced. The phone will show a warning when charging. This is not critical for work, but you can only get rid of it by flashing it.
When is the best time to contact the service
Not all breakdowns can be repaired by yourself.
- 💥 Battery swelling or leaking - it is dangerous to health!
- 🔧 You damaged the display plume or motherboard during disassembly.
- 📱 The phone will not turn on even after checking all connections.
- 🔋 The new battery does not hold charge (discharges for the battery). 1-2 hour), and calibration does not help.
- 💧 The device got into the water after replacing the battery (risk of corrosion).
Cost of battery replacement in the service:
- Budget models (Redmi 9/10 series): 1500-2500 rubles.
- Mid-segment (POCO X3/X4, Redmi Note 11/12): 2000–3500 rubles.
- Flagships (Xiaomi 12/13, Mix 4): 3000-5000 rubles.
In official service centers, Xiaomi gives a guarantee for work (usually 3-6 months), but the price there is higher by 20-30%. Unofficial workshops can make cheaper, but the risk of running into an unqualified master is higher.
💡
If you’re not sure about your skills, it’s better to pay more than damage your phone, especially with models with amolede screens (like the Xiaomi 12), where the display plume is very fragile.