How to change the battery on Xiaomi Redmi Note: full instructions with photos and nuances

Xiaomi Redmi Note smartphones have long been popular for their value for money, but even the most reliable models face battery wear over time. If your Redmi Note starts to run out in a few hours, turn off in the cold or suddenly shut down at 20-30% charge, it’s time to replace the battery. In this article, we’ll discuss how to do it yourself without going to the service center, saving up to 70% of the cost of repair.

The process of replacing the battery with a Redmi Note (whether it’s the Note 8 Pro, Note 9S or Note 11) requires care, but does not require professional skills. The main thing is to choose the right original or quality alternative battery, prepare tools and follow the instructions. We will look at all the steps from fault diagnosis to calibration of the new battery, and also tell you which models of Redmi Note have adhesive battery that requires a special approach when extracting.

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

Before you start replacing, make sure the battery is the problem, and here are the typical symptoms of critical battery wear:

🔋 The smartphone is running out of power. 50% more 2-3 hours with moderate use (social networks, messengers).
❄️ The device is turned off in the cold or in a cool room (even when 30-40% charge).
🔌 Charging jumps: for example, from 80% immediately drops to 20%, or the phone shows 100%, but after 5 minutes it turns off.
🔥 The battery swelled (see on the raised back cover or screen, if you press on the body).
⚡ B Settings → The state of the battery is shown less than 70% of the original capacity (on new ones). MIUI).

If you have at least 2-3 items on your Redmi Note list, it's time to change the battery, and a bloated battery is especially dangerous, it can damage the screen or even ignite, in which case it's better to replace it immediately.

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it! this could cause fire.Switch off the phone and start replacing as soon as possible.

📊 What kind of Redmi Note model do you have?

Redmi Note 8/8 Pro

Redmi Note 9/9S/9 Pro

Redmi Note 10/10 Pro

Redmi Note 11/11 Pro

Another model

What battery to choose for Redmi Note: original vs analogues

The battery quality depends on how long your smartphone will last after replacing. There are three types of batteries on the market for the Xiaomi Redmi Note:

Type of battery	Pluses	Cons	Cost (2026)
The original (Xiaomi)	Guaranteed compatibility, long service life (800+ cycles), accurate capacity.	High price, rarely available, many fakes.	1 800–3 500 ₽
Quality analogues (ATL, Sunwoda, Desay)	Good price/quality ratio, often the same as the original (same factories).	The work time may vary slightly (by 5-10%).	1 200–2 200 ₽
Budgetary analogues (no-name)	Low price, easy to find.	Small resource (300-500 cycles), possible problems with charging, bloating.	500–1 000 ₽

For the Redmi Note 8/9/10/11, batteries labeled BM40 (4000 mAh), BM41 (4100 mAh) or BM47 (4700 mAh) will suit, depending on the model.

📱 Redmi Note 8 Pro — BM47 (4,500 mAh).
📱 Redmi Note 9 Pro — BM41 (4 100 mAh).
📱 Redmi Note 10 Pro — BM47 (5,020 mAh).

Buy batteries only from trusted sellers (e.g. AliExpress with a rating of 98%+, Beru, MVideo or specialized stores like Xiaomi Shop).

🔍 Marking (must match the original).
📦 Packaging (the original is in a branded box with a hologram).
🔋 Capacity (check with the tester when receiving).

💡

Check the battery serial number on the manufacturer's website before buying (if possible).

Battery Replacement Tools: What You Need

For a self-replacement, prepare the following set:

New battery (proven)

Plastic mediators or shoulder blades (2-3 pieces)

Cross screwdriver (PH00 or PH0)

Screen suction cup (optional, for models with adhesive display)

Dryer or thermo-air station (for softening the glue)

Tweezers (convenient for disconnecting plumes)

Alcohol wipes (to clean contacts)

Double-sided tape or glue (if the battery is glued)

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Pay special attention to plastic mediators, which will help to gently tamper with the battery without damaging it. Metal tools can not be used, as they can puncture the battery.

If you have a model with an adhesive battery (like the Redmi Note 10 Pro or Note 11), you will need a dryer to soften the adhesive.°C so as not to damage the screen or board.

⚠️ Warning: Do not use a knife or other sharp objects to remove the battery! lithium batteries are extremely sensitive to mechanical damage and can ignite.

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

The battery replacement process varies from model to model, but the overall pattern is the same. Consider the universal algorithm using the Redmi Note 9 Pro (similar to Note 8/10/11):

Step 1: Turn off and prepare the phone

Before the disassembly:

Turn off your smartphone (clip Power + Volume up for 10 seconds if it doesn’t respond).
Extract. SIM-card and memory card (if any).
Remove the cover and clean the case of dust.

Step 2: Removal of the back cover

Most Redmi Note models have the lid attached to the latches and glue to remove it.

Heat the edge of the body with a hair dryer (30 seconds on each side) at a distance of 5-7 cm.
Push the cover with a plastic mediator, starting at the bottom corner (near the USB-C connector).
Carefully drive the mediator around the perimeter, snapping the clamps.

What to do if the lid does not lend itself?

If the lid is not removed, the glue may be too strong. Try: 1. Increase the dryer temperature to 70-80°C (but not higher!). 2. Use a screen suction cup (stick it to the back cover and pull it up). 3. Drink alcohol around the perimeter (it dissolves the glue). Don't make excessive efforts - you can break the latches!

Step 3: Unconnecting the plumes and removing the battery

After the lid is removed:

Unscrew the screws that fix the metal plate above the battery (usually 4-6 screws).
Disconnect the battery plume from the motherboard (use tweezers or a plastic shoulder blade).
If the battery is glued, pull it on the side and pull a special black tape (pull-tab), if it is not, carefully tuck the battery into the mediator, heating the hair dryer.

Important: Don't pull the battery by wires or contacts! This can tear off the plume.

Step 4: Installation of a new battery

Before installation:

Clean the contacts on your phone and new battery with an alcohol napkin.
Remove the protective film with the adhesive side of the battery (if any).
Set the battery in place, press and connect the plume.

Step 5: Assembly of the phone

Collect the phone in reverse order:

Secure the metal plate with screws.
Stick the back cover (use a new double-sided scotch or B-7000 glue).
Secure the latches by heating the cover with a hairdryer for better fit.

1. Is the battery plume connected to the motherboard?

2.Are there any damages to the battery contacts?

3. whether all screws are properly fixed (unwounded can close the board).-->

Calibration of the new battery: why it is important

After the battery is replaced, it needs to be calibrated so that the charge controller correctly determines the level of charge, otherwise the phone may show the wrong percentage or quickly discharge.

How to calibrate:

Charge your phone to 100% (use the original adapter).
Turn off the charging and let the phone discharge before automatically turning off.
Connect the charger and wait 100% without turning on the phone.
Turn on your smartphone and check the charge level in Settings → Battery status.

Repeat the cycle 2-3 times, and then the controller adapts to the new battery, and the operating time is stabilized.

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If the phone still discharges quickly after calibration, check the background processes in Settings → Battery → Battery use. Perhaps some application is consuming charge.

Frequent battery replacement errors and how to avoid them

Even if you change it carefully, you can make mistakes that will cause your phone to fail.

🔌 Damage to the battery plume -- if you rip it off, you'll have to solder a new one. Always unplug the plume with tweezers, not with your fingers.
🔥 Overheating the battery with a hairdryer – heat the case for no longer than 30 seconds at a time, so as not to melt the separator inside the battery.
🛠️ Using metal tools -- they can puncture a battery. Only plastic!
📉 Incorrect calibration – if you don’t do a full charge-discharge cycle, the phone will show an incorrect percentage.
🔩 Lost screws -- Redmi Notes have different lengths of screws, and if you mix them up, you can damage the board.

If the phone does not turn on after replacement, check:

🔋 Is the battery connected to the board.
🔌 Does the sleeve not move when you press the body.
🔧 Whether all screws are twisted (uncrewed can close contacts).

How long will the new battery last and how to extend its life

The battery life depends on its type and operating conditions:

🔋 Original battery — 800-1000 cycle (2-3 year with active use).
🔋 Quality analogue — 500-700 cycle (1.5-2 year-end).
🔋 Budgetary analogue — 300-500 cycle (1 year).

To extend the life of the battery:

🔌 Avoid deep discharge (do not allow a fall below 10%).
⚡ Do not use fast charging all the time (it speeds up wear).
🌡️ Do not leave your phone in the sun or in the car (optimal temperature — 10-35°C).
🔄 Once every 3 months, do a full discharge-charge cycle for calibration.

💡

If you don't use your phone very often, store it with a charge of 40-60%, and a fully charged or discharged battery degrades faster.

FAQ: Frequent questions about replacing the battery with Xiaomi Redmi Note

❓ Can I replace the battery with Redmi Note without disassembly?

No, replacing the battery always requires a complete disassembly of the phone, the battery is located inside the case and soldered (or glued) to the board, without removing the back cover, it cannot be reached.

❓ How much does it cost to replace a battery in a service center?

Cost of replacement in 2026 The year: Redmi Note 8/9 — 1 500–2 500 ₽ (with work. Redmi Note 10/11 — 2 000–3 500 ₽ (It's a little bit difficult to disassemble. 2-3 cheaply.

❓ How to check if the original battery was sold to me?

Xiaomi's original battery has: a hologram on the package; clear labeling (model, capacity, production date); factory tape on the contacts; serial number that can be checked on Xiaomi's website (if supported); counterfeits often have erased labels, curved seams, or a mismatch in declared capacity.

❓ What to do if the phone does not turn on after replacement?

Possible causes and solutions: Battery plume is not connected, take the phone apart and check the connection. The board is damaged, if the chips are broken, you need diagnostics. Battery marriage, try connecting another (knowingly working) battery. Flown firmware - try to go to Fastboot (clamp Power). + Volume down) and reflash the phone.

❓ Can I use a battery with a larger capacity than the original?

Technically possible, but not recommended. Problems that may arise: mismatch in size (the battery will not fit into the case), overheating due to increased load on the charge controller, incorrect display of the percentage of charge, preferably choose the battery with the original capacity or 10-15% larger (if the dimensions are the same).