Xiaomi smartphones are known for their value for money, but even the most reliable models face the problem of battery wear over time. 20-30% If you're charging or you're swelling, you're going to have to think about replacing it. 1,5-3 thousands of rubles, but with the tools and patience you can do everything yourself.
In this article, we will analyze the step-by-step process of replacing the battery on popular Xiaomi models (Redmi Note 10/11/12, POCO X3/X4, Mi 11/12, etc.), tell you how to choose a quality battery, what tools you will need, and reveal the secret of extending the life of a new battery by 30% longer than the standard period.
Signs that it is time to change the battery
It's not always low battery life that means battery wear, sometimes software failures or application background consumption, but there are 5 key symptoms that point directly to the need to replace batteries:
- 🔋 The phone's emptying on 50% more 2-3 hours without active use (when the screen is off).
- 💥 The case of the smartphone swelled or there were gaps between the screen and the back cover.
- ⚡ Charging is interrupted or the phone is disconnected when connected to the network (symptom of a “false charge").
- 📉 Settings menu → The battery state of the container shows less 70-75% starting-point.
- 🔥 The phone gets very hot when charging or working (over 45).°C. Data from applications like CPU Monitor).
If you see at least 2-3 signs from the list, the probability of battery wear is greater than 90%. Check the capacity through the engineering menu (code ##4636## → Battery information) or the AIDA64/AccuBattery app. If the actual capacity is below 2000 mAh (for most Xiaomi models), a replacement is inevitable.
⚠️ Attention: A bloated battery is a fire hazard. Don't delay replacement if the body is deformed. Even minor mechanical impacts (blows, falls) can lead to fire.
How to choose a high-quality battery for Xiaomi
The choice of battery is responsible for 80% of the success of a replacement, and cheap ones from AliExpress or unknown stores can not only quickly fail, but also damage the power controller of a smartphone.
- 🔍 Check the original battery article (printed on an old battery pack or specified in the model specifications). For example, for the Redmi Note 10 Pro, this is the first battery. MBJ4301.
- 🛡️ Buy only from official distributors (Mi Store, Messenger, M. Video) or verified sellers on the Internet. Wildberries/Ozon higher-ranked 4.8.
- 📦 Note the packaging: Xiaomi’s original battery has a hologram, serial number and production date (no older than 6 months).
- 🔋 Capacity should match the factory (for example, 5020 mAh for POCO X3 Batteries with overcapacity (e.g., 6,000 mAh instead of 5,000) are fake.
| Xiaomi model | Battery articulation | Capacity (mAh) | Average price (2026) |
|---|---|---|---|
| Redmi Note 10 Pro | MBJ4301 | 5020 | 1 200 — 1 800 ₽ |
| POCO X3 Pro | MBJ4299 | 5160 | 1 300 — 1 900 ₽ |
| Mi 11 Lite | MBJ4287 | 4250 | 1 000 — 1 500 ₽ |
| Redmi 9A | MBJ4265 | 5000 | 800 — 1 200 ₽ |
Avoid batteries labeled "Premium," "Ultra Capacity" or "High Quality" are marketing ploys. Xiaomi's original batteries don't have these labels. If the seller offers an "enhanced" version, it's 100% fake.
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Check the reviews of the seller before you buy, often fakes are passed off as originals using photos from the official website, and ask the seller to shoot a video of the battery and packaging, this will reduce the risk of fraud.
Required tools for replacement
To replace the battery with Xiaomi, you will need a minimum set of tools, most of which can be bought at electronics stores (Chip and Deep, 220 Volts) or ordered on AliExpress:
- 🔧 Plastic blades (2-3 (S) to separate the body; metal mediators may scratch the frame.
- 🔨 The screwdriver (PH00 or PH0) For the back cover screws, some models need to be Y00 (star).
- 🔥 Hair dryer or thermo-air station for softening glue (temperature) 60-80°C).
- 🧲 Magnetic mat or screw container to avoid losing small details.
- 🩹 Gloves and safety glasses (optional, but recommended when working with a bloated battery).
- 🔌 Isopropyl alcohol (90%+) Cleaning contacts and removing glue residues.
If you plan to repair equipment often, it makes sense to buy a set for repairing smartphones (cost) ~500-800 ₽). It already includes all the necessary tools, including suction cups and tweezers, and for a single replacement, you can do with a minimum set.
⚠️ Warning: Do not use knives, scissors or other sharp objects to lick the lid.This may damage the display plumes or power/volume buttons that are located on the sides of the body.
☑️ Preparation for battery replacement
Step-by-step instructions for replacing the battery
The battery replacement process on most Xiaomi models is similar, but there are nuances depending on the series. Below is a universal instruction, taking into account the features of popular devices. For clarity, use the disassembly on iFixit (select your model).
Step 1. Turn off and heat the body
Turn off the phone completely. If the battery is swollen, don't charge, it can cause a short circuit. Warm up the back cover with a hairdryer for 2-3 minutes, holding it at a distance of 10-15 cm. The glue will become softer, and the cover will be removed easier. Don't overheat - temperatures above 80 ° C can damage the display.
Step 2. Remove the back cover
Insert a plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connectors are located). Carefully drive the blade around the perimeter, separating the glue. On the POCO X3 and Redmi Note 10 models, the lid is held on the latches - apply a force evenly so as not to break the mounts.
Step 3. Shutting down the battery
When you take the lid off, you'll see the battery locked in a black film, and the first thing you do is unplug the battery connector (usually located at the top of the board, next to the camera), and use a plastic spatula to plug the connector -- don't pull the wires!
What happens if you don’t turn off the battery before work?
Step 4: Remove the old battery
The battery is glued to the body. Put a plastic blade on any edge and slowly pull it up. If the battery doesn't respond, warm it up with a hair dryer (no higher than 60°C). Some models (Mi 11) have a graphite pad under the battery -- don't hurt it, it's responsible for the heat sink.
Step 5: Installation of a new battery
Before installation, clean the contacts of the new battery and the connector on the board with isopropyl alcohol. Stick the battery to double-sided tape (included) or use the original glue (for example, B-7000). Connect the connector and check that it sits tightly - backlash can cause loss of contact.
Step 6: Assembly of the phone
Make sure all the plumes are connected (display, buttons, speakers). Close the back cover and snap it, pressing the perimeter. Turn on the phone and check the charge: if the indicator shows 0%, connect the charge for 10-15 minutes - this is normal for a new battery.
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After replacing the battery, be sure to calibrate: completely discharge the phone before turning off, then charge to 100% without interruptions. Repeat the procedure 2-3 times - this will extend the battery life by 20-30%.
Frequent Mistakes and How to Avoid Them
Even the skilled craftsmen sometimes make mistakes when replacing the battery. TOP-5 Failures that lead to phone breakdown:
- 🔌 Connect the battery to full assembly. If you hit the board with a screwdriver when the battery is connected, you short-circuit. Solution: always turn off the battery first and plug in the last one.
- 🔥 Battery overheating with a hairdryer. Temperature above 80.°C can warp the battery or melt the glue.Solution: use a thermometer and keep the hair dryer 15 cm away.
- 🛠️ Using metal tools, mediators or knives scratching the body and can close contacts, solution: plastic blades and insulated tweezers only.
- 📱 Incorrectly installing the plumes. If you confuse the display and sensor connectors, the screen will not work. Solution: photograph the location of the plumes before disassembling.
- 🔋 Buying a battery from an unknown manufacturer, cheap batteries may not hold a charge or swell in a month, so you can check the article and only buy from official suppliers.
Another common problem is that the phone doesn't turn on after it's replaced, and there are many reasons.
- The battery connector is not tightly connected (check contacts).
- The power supply is damaged (the board needs repair).
- The new battery is discharged "to zero" (plug charging for 30 minutes).
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If the phone is quickly discharged after replacing, check the background consumption in the settings (Settings → Battery → Battery Use). Sometimes resetting to factory settings (Settings → Additional → Recovery and Reset) helps normalize the new battery.
How to prolong the life of a new battery
Even the original battery will not last long if you do not follow the rules of operation. Follow these tips to keep the capacity at 80% and above in 2 years:
- 🔌 Charge your phone at temperature 10-30°C. Cold and heat accelerate degradation of lithium-ion batteries.
- 📈 Keep the charge between 20% and 80%. Complete cycles (0-100%) shorten service.
- ⚡ Use the original RAM. Fast charging (33W/67W) Safe, but the constant use of cheap adapters harms the battery.
- 🛌 Don't leave your phone charging overnight. After 100%, the battery goes into recharging mode, which increases wear and tear.
- 🔄 Calibrate the battery every 3 months (full discharge) + charge%).
On models with MIUI 12 and later, enable Optimized Charging (Settings → Battery → Battery settings) which limits the charge to 80% and brings it to 100% just before waking up (on your schedule), which reduces wear by 40%.
| Action. | Impact on the battery | Recommendation |
|---|---|---|
| Use of wireless charging | Increases the temperature of the battery by 5-10 ° C | Do not charge wirelessly for longer than 1 hour in a row |
| Charging games | Battery temperature rises to 45-50°C | Let the phone cool down before the game |
| Storage of a discharged phone | Deep discharge (below 3%) damages cells | Charge up to 50% before long-term storage |
When is the best time to contact the service
Self-replacement of the battery is not suitable for all cases.
- 🔧 You’ve never broken down electronics and are afraid of damaging your phone.
- 💥 Battery is heavily bloated (risk of rupture when extracted).
- 📱 Xiaomi has a complex design (e.g., Mi Mix 4 or Black Shark with liquid cooling).
- 🔌 After replacement, the phone does not turn on or charge.
- 🛡️ You do not have tools or suitable conditions (dust room, high humidity).
The cost of replacement in the service varies from 1,000 to 3,000 rubles depending on the model. Xiaomi official centers give a guarantee of 6 months for work and battery, but the price tag there is higher by 30-50%. Informal workshops can offer cheaper, but the risk of running into a fake or poor-quality repairs is higher.
⚠️ If after the battery replacement, the phone stopped seeing SIM-map or camera is not working, most likely you damaged the plumes during the assembly.