Xiaomi battery replacement: full instructions from preparation to calibration

Xiaomi smartphones are known for their value for money, but even the most reliable models face the problem of a worn-out battery over time. 10, POCO X3 or Mi 11 It is discharged in half a day, it is turned off when 20-30% If you're charging or you're swelling, it's time to replace the battery. In this article, you'll find step-by-step instructions with photos, video recommendations and tips for choosing a quality battery.

Xiaomi’s battery replacement process is more complicated than older phones with removable lids, but with the right approach, it can be done on your own. We’ll take a look at all the steps from diagnosing a malfunction to first charging a new battery. And if you’ve never taken a smartphone apart, don’t worry: there’s a list of tools you need and warnings about typical errors.

How to know if the battery is time to change: 5 obvious signs

Before you start the screwdriver, make sure that the battery is the problem, and here are the key symptoms that indicate battery wear:

🔋 Phone's running out of power. 3-4 hours with moderate use (social networks, messengers, calls).
📉 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
🔌 The device is switched off when 20-30% charge and not activated without recharging.
📱 The case of the smartphone swelled (noticeably the gap between the screen and the frame or the “slapping” back cover).
🔥 The phone gets very hot while charging or playing (but not because of the processor!).

If any of these signs are familiar, your battery needs to be replaced. For accurate diagnosis, you can use applications like AccuBattery (reveals real capacity) or the built-in menu ##4636# (Batter Information section), and a capacity below 70% of the factory capacity (e.g., 3000 mAh instead of 4500 mAh) is a critical indicator to replace.

⚠️ Warning: If the case of the smartphone is swollen, don't delay replacement! The risk of damage to the screen or internal components grows every day. In extreme cases, even a fire is possible.

What battery to choose for Xiaomi: original vs analogues

The quality of the battery not only determines the time of operation, but also the safety of the device. Here are 3 options that are worth considering:

Type of battery	Pluses	Cons	Price (rupe)
The original (Xiaomi)	Compatibility guarantee, optimal resource, security	Expensive, hard to find (often fake)	1 500–3 000
Certified analogue (ATL, Sunwoda)	Quality close to original, cheaper, easy to buy	Maybe give up on work time.	800–1 800
Budgetary analogue (no-name)	Very cheap, fast delivery.	Risk of bloating, low resource, possible overheating	400–1 000

For most users, the best choice is certified analogues from the ATL Or Sunwoda (the same manufacturers supply batteries for Xiaomi), the original batteries should only be taken if you find a reliable seller with a guarantee (for example, in branded service centers), avoid no-name batteries without labeling - they can damage the smartphone.

When buying, check:

🆔 Article (e.g., articular, MB-J20 For the Redmi Note 9 Pro).
📏 Capacity (must match the factory, for example, 5020 mAh).
🔍 Availability of a protective controller (without it, the battery will last less).
📅 Production date (fresh – better, ideally no older than 6 months).

📊 Which battery would you prefer to replace?

The original Xiaomi

Certified analogue (ATL/Sunwoda)

Budget no-name

I haven't decided yet.

Preparing for replacement: tools and safety

Replacing a battery in Xiaomi requires care and the right tools. Here is the full list of things you'll need:

If you don’t have experience disassembling equipment, practice on an old smartphone or watch video disassemblies for your model (for example, on the YouTube channel Xiaomi Repair).

🔧 Type of screen attachment (glue or latching).
🔌 Location of the plumes (they are easily damaged!).
🔥 Presence of glue under the battery (a hair dryer will be required to soften).

⚠️ Warning: Do not use metal tools to tamper with the battery - this can cause short circuit!

Before the start of the work:

Turn off your smartphone and remove it. SIM-map.
Discharge the battery before 20-30% (This will reduce the risk of fire if damaged).
Prepare a clean, well-lit workplace (it is better to cover the table with a cloth).

💡

If the glue under the battery is too strong, warm the case with a hairdryer (temperature 60-80).°C) for 1-2 minutes. Do not overheat, it may damage the screen!

Step-by-step: how to disassemble Xiaomi and replace the battery

The disassembly process may vary slightly depending on the model, but the overall scheme is the same. Consider a universal algorithm using the Redmi Note series:

Step 1: Removing the back cover

Most modern Xiaomi have a non-shattered body, so the lid will have to be carefully tampered with:

Warm up the hair dryer edge of the back panel (especially near the buttons and connector). USB).
Secure the suction cup at the bottom edge of the screen and pull up.
Insert a plastic shoulder blade into the resulting gap and slowly lead it around the perimeter.

If the lid does not lend itself, do not make excessive efforts - it is better to warm up the glue again.

Step 2: Disconnect the plumes and batteries

After removing the cover, you will see:

🔋 Battery (usually takes up half of the body).
🔌 Camera plumes, dynamics and buttons.
🛠️ Screws that fasten the motherboard.

First, turn off the battery:

Find the battery connector (usually black or red, with the label on it) BATT).
Carefully tuck it with a plastic spatula (do not pull the wires!).

⚠️ Warning: Never disconnect plumes with metal tools - this can close contacts on the board!

Step 3: Remove the old battery

Xiaomi's battery is glued to the body to remove it.

Tap the edge of the battery with a plastic spatula.
Pull on special "ears" (if any) or gently poke around the perimeter.
If the battery does not go away, warm it up with a hairdryer (no more than 1 minute!).

Take your time, a damaged battery can ignite. If it swells, don't prick it!

Step 4: Installation of a new battery

Before installation:

Check to have duct tape on the new battery (or stick double-sided tape).
Make sure the contacts are clean (wipe with alcohol if necessary).

Carefully plug the battery connector and put it back in place. Press the edges so that the glue grabs.

Step 5: Build a Smartphone

Collect the phone in reverse order:

Then, connect all the sleeves (make sure they are tightly sliding into the connectors).
Set the screws (do not pull!).
Stick the back cover (use the original glue or quality analogue).

What if the phone does not turn on after assembly?

1. Check if the battery connector is plugged in (sometimes it drops out when assembly). 2. Make sure the screen plume is not damaged (if the screen isn't shining, but the phone vibrates when turned on). 3. Try charging the phone for 10-15 minutes - the new battery can be completely discharged. 4. If nothing helps, check the motherboard for damage (preferably at a service center).

Calibration of the new battery: why it matters

After the battery is replaced, it needs to be properly run in order for the charge controller to correctly determine the level of charge.

Use your phone until you turn off automatically (do not recharge!).
Full Charging: Connect the original RAM and charge up to 100% without interruptions (preferably switched off phone).
Recycle: Discharge again to 0% and charge to 100%.

This procedure helps synchronize the controller data with the actual battery capacity.

📊 The percentage of charge will be displayed more accurately.
🔋 Working hours will increase by 10-15%.
📉 Disappear “jump” charge (for example, from 50% to 20%).

⚠️ Note: Do not use "fast" charging in the first place 3 The charge cycle of a new battery could reduce its lifespan. 5V/2And.

💡

Calibration of the new battery takes 1-2 days, but without it, the phone can show the wrong level of charge and discharge faster.

Common Mistakes When Replacing a Battery and How to Avoid Them

Even experienced users sometimes make mistakes that damage the phone or cause a new battery to fail quickly.

🔧 Using inappropriate tools: Metal screwdrivers or knives can puncture a battery or close the board.Solution: Buy plastic shoulder blades or a smartphone repair kit.
🔥 Battery overheating with a hairdryer: Temperature above 80°C will damage the screen or melt the plumes Solution: Keep the hair dryer 10cm away and heat no longer than 1 minute.
📉 Incomplete plume shutdown: If you forget to disconnect the battery before work, you can burn the motherboard. Solution: Always first turn off the connector. BATT.
🔋 Buying a fake battery: No-name batteries often have understated capacity and swell after 2-3 months.Solution: Buy only from trusted sellers (see section on battery selection).
🛠️ Pressure too much to build: Twisted screws can damage the board or screen. Solution: Tighten the screws with a cross screwdriver without effort.

If the battery is quickly discharged after replacement or the phone overheats, the probable causes are:

Poor battery (check the article and manufacturer).
Damaged battery plume (must be replaced).
Incorrect calibration (repeat the procedure).
Background processes (check in Settings) → Battery).

💡

If after replacing the battery, the phone became slower to work, reset to factory settings (Settings) → The phone. → Resetting settings. This will help to eliminate software errors associated with the new battery.

Should I change the battery myself or contact the service?

Self-replacement of the battery in Xiaomi costs 2-3 times cheaper than in the service center, but not for everyone.

Criteria	Independently.	Service centre
Cost	400–2000 rubles (battery) + tool)	1,500–4,000 rubles (with work)
Time.	1-3 hours (with preparation)	1-2 days (depending on the load)
Guarantee	Battery only (if you bought with a guarantee)	1-6 months at work and details
Risks.	Damage to screen, board, plumes	Minimum (when contacting the verified service)
Difficulty	Medium (tools and accuracy needed)	No, they'll do it for you.

It is worth contacting the service if:

You have a model with a complex design (for example, Xiaomi Mix Fold or Black Shark).
You've never been a computer expert.
The battery swelled and deformed the body (risk of screen damage).
You need a warranty for work (for example, if the phone is guaranteed by the official seller).

Self-replacement is justified if:

You have a popular model (Redmi Note) 8/9/10, POCO X3/F3), hyde.
You are ready to buy quality tools (they will be useful for future repairs).
You want to save money and not be afraid of risks.

FAQ: Frequent questions about battery replacement in Xiaomi

🔋 Can you replace the battery in Xiaomi without disconnecting the screen plume?

No, it's extremely risky. The plume is fragile, and if you move it sloppy, it's easy to damage it, and if the battery is swelling, it can push the screen, and if you remove the lid without turning off the plume, you risk tearing it off. Always turn off all the plumes before disassembling.

📱 How to check if the original battery is installed in my Xiaomi?

There are several ways: Look at the battery label: the original ones have a hologram and clear labeling (e.g. Made by) ATL Or Sunwoda. Use the app. AIDA64 (The battery section shows the manufacturer. Compare capacity: if AccuBattery shows less than 80% of the factory capacity, the battery is either worn out or fake. Fake batteries often have blurred labeling, no production date, or understated capacity.

⚡ Can I use fast charging after replacing the battery?

Yeah, but not immediately. 3–5 Charging cycles are recommended to use standard RMS (5V/2A) to get the battery used to the new controller, and then you can go back to fast charging (Quick Charge, Fast Charge, etc.) Exception: if you have a budget counterpart without fast charging support, use only standard chargers.

🔧 What to do if after replacing the battery, the phone does not hold the charge?

There are several reasons: Poor battery — check manufacturer and capacity. Wrong calibration — perform 2-3 full discharge/charging cycles. Damaged charge controller — if the phone does not see a new battery, the problem may be in the board (diagnosis). Background processes – check battery consumption in Settings → Battery. If the problem doesn't go away, try resetting to the factory or contact the service.

💰 How much does it cost to replace the battery in the official service Xiaomi?

Cost depends on the model: Redmi 9/Note 9: 1 800–2 500 ruble. POCO X3/X4: 2 000–2 800 rub. 11/12: 2 500–3 500 Flagship models (Xiaomi) 13, Mix 4): 3 000–5 000 The price usually includes work and the original battery — 1–3 Please only contact authorized service centers (the list is available on the Xiaomi website).