Replacement of the battery on Xiaomi Redmi: full analysis with photos and videos

Replacing the battery on Xiaomi Redmi smartphones is one of the most popular procedures among brand owners. After 2-3 years of active use, even the highest-quality batteries lose up to 30-40% of capacity, and the device begins to discharge in a few hours. If your Redmi Note 10 Pro, Redmi 9A or another model in the series began to turn off 20-30% of charge or the back cover swelled, it’s time to think about replacing.

In this article, we will take a look at the entire process from choosing a new battery to final assembly, taking into account the nuances of different Redmi generations, what tools you will need, how to avoid disassembly errors and what to do if the phone does not turn on after replacing, and also where to buy the original battery and how to verify its authenticity before installing it.

Let me warn you right away: the procedure requires precision and basic electronics skills. If you've never disassembled a smartphone, you'd better go to a service center. But if you're willing to try, follow our instructions Step-by-step.

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

It's not always low battery life that means battery wear, and sometimes the problem is software failures or application consumption, but there are symptoms that clearly indicate physical wear and tear.

• 🔋 The phone turns off at 20-30% charge and turns on only from charging (even if previously indicated 15-20%).
• 📱 The back cover or the screen is swelling -- it's dangerous! It can ignite.
• ⚡ Charging is jerky: it quickly gains interest, then “hangs” on one value.
• 🔥 The body heats up strongly in the battery area even under minimal load.
• 📉 In the Settings menu → Battery state is less than 80% of the original capacity (e.g., 3200 mAh instead of 4000 mAh).

If you see at least 2-3 signs from the list, the battery needs to be changed. Especially critical point about bloating: using such a smartphone is dangerous! Lithium-ion batteries can ignite or explode if damaged.

⚠️ Warning: If the battery is swelling, don't try to prick or bend it! This can cause fire. Take the phone to the service or gently disassemble it outside with a non-combustible container (such as a metal jar).

2. Which battery to choose: original vs analogues

The battery quality is not only the key to battery autonomy, but also the safety of the device, and the market is full of fake Xiaomi batteries that can damage the power controller or even ignite.

For Redmi models, two companies make the original batteries: ATL (Amperex Technology Limited) and Sunwoda. Both supply components directly to Xiaomi, so their counterparts are considered the most reliable.

• 🔍 Marking: The original battery must have the Xiaomi logo, smartphone model and production date.
• 📦 Packaging: branded box with a hologram and QR- code (can be checked on Xiaomi's website).
• 🔧 Contacts: The original has smooth, no soldering marks.

Where to buy it?

• 🛒 Official service centers are 100% original, but expensive.
• 🌍 AliExpress (stores rated 98%+) is cheaper, but check reviews.
• 🏬 Local parts stores - ask for certificates.

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Before buying, check the battery model number in Settings → About Phone → Core Version or on an old battery. For example, for the Redmi Note 11 Pro, it is BM4X, and for the Redmi 9C, it is BL20.

3. Replacement tools: what will be needed

Xiaomi Redmi doesn’t need professional tools to disassemble, but you can’t do without them.

• 🔧 Plastic blades/mediators (2-3) – for separation of the cover and the battery.
• 🔨 Cross screwdriver (PH00 or PH0) — hull-rotor.
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C).
• 🧲 Magnetic mat or container – so as not to lose screws.
• 🔌 Tweezers to detach the plumes.
• 🛡️ Gloves and safety glasses in case the battery is damaged.
• 📱 New battery - authenticated.
• 🧴 Isopropyl alcohol (90%+) — glue-cleaner.

If you have a model with a fixed lid (for example, the Redmi Note 10/11/12), you can not do without a hair dryer - the glue on these phones is very strong. For older models (Redmi 4X, 5A), you can do with shoulder blades.

Turn off the phone and remove it. SIM-map|Make a backup copy of the data|Charge the phone before 30-50% (If the battery is still working)|Prepare a workplace with good lighting|Wear an antistatic bracelet (optional)-->

⚠️ Warning: Don't use metal tools to separate the battery! One careless move will puncture the battery, causing a short circuit or fire. Just plastic blades!

4. Step-by-step instructions: how to disassemble Xiaomi Redmi and replace the battery

The battery replacement process varies from model to model, but the overall pattern is the same. We'll look at a generic algorithm using the Redmi Note 10 Pro (similar to the Note 9/11/12, Redmi A1/A2, etc.) and the older models (Redmi 4/5) have a simpler, removable lid.

Step 1. Turn off the phone and remove the back cover

Turn off the device, take out the tray for the SIM- cards. Heat the tailbone edge of the back cover with a hair dryer (do not direct the air flow to the screen!). Temperature is 60-80°C, time is 2-3 minutes. Then gently tuck the lid with a plastic blade, starting at the bottom edge (near the USB-C connector).

Step 2. Unscrew the screws and unplug the plumes.

Remove 8-10 screws (depending on the model) with a cross screwdriver. The screws can vary in length — remember where you were! Then disconnect the battery plumes, the display and the motherboard. Use tweezers to gently lift the latches of the connectors.

Step 3: Remove the old battery

The battery in Redmi is glued to the body. Put a plastic blade on the side and slowly pull it up. If the glue is too strong, put the isopropyl alcohol under the battery, it will dissolve the adhesive. Don't bend the battery or use force!

Step 4: Install a new battery

Check the contacts on the new battery, which should match the old ones, stick double-sided tape (complete with the battery), or apply a thin layer of B-7000 glue, connect the plume and see if the battery is tight.

Step 5: Reassemble the phone in reverse order

Connect all the plumes, twist the screws (don't pull over!) Make sure no cables are clamped. Stick the back cover onto double-sided tape or special glue.

5. Features of replacement for different models of Redmi

Xiaomi Redmi’s design has evolved, and battery replacement is more difficult in newer models than in older ones.

For Redmi Note 10 Pros and newer models, be careful with the fingerprint scanner plume, which is thin and easily torn. In the Redmi A-series, the battery connects through a flexible cable that is sometimes soldered to the board. If you can't solder, you better take it to the service.

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Redmi Note 11 and later use 3M VHB glue, which is very durable. Without a hair dryer or thermoplastic, it's almost impossible to remove the lid!

6. Frequent mistakes and how to avoid them

Even experienced tycoons sometimes make mistakes when replacing batteries, and here are the most common mistakes and how to prevent them:

• 🔧 Torn screws -- use a high-quality screwdriver and don't use excessive force. If the screw is licked, rubber band or superglue will help.
• 🔥 Train damage -- never pull the wires! Just the plastic connectors.
• 📱 Battery tight fit -- if the battery is hanging, it can detach on impact. Use double-sided tape.
• ⚡ Short circuit – Remove static electricity before work (touch a metal object).
• 🔋 Incompatible battery – even if the connector fits, the wrong charging controller can burn the board.

Another common problem is that the phone doesn't see the new battery.

• The sleeve is not connected (check the connector).
• The battery is discharged "to zero" (plug the charge for 10-15 minutes).
• The power controller is damaged (diagnosis is needed in the service).

⚠️ Warning: If the phone turns on after the replacement but discharges quickly, check if the battery is installed correctly. Sometimes the battery temperature sensor will depart, and the system thinks that it overheats, forcing the discharge.

7. Calibration of the new battery: why it matters

After you change the battery, you have to calibrate it so that the power controller can correctly determine the charge level, otherwise the phone can go 100 percent and then suddenly turn off after an hour.

1. Charge your phone to 100% (use original charging).
2. Turn off the charging and let the phone discharge before automatically turning off.
3. Connect the charger and wait 100% without turning on the phone.
4. Turn off the charge, turn on the device and check the charge level.
5. Repeat the cycle 2-3 times.

For models with MIUI 12+, it is also recommended to reset the battery data:

1. Go to Settings. → The phone.
2. Click 5 times on the MIUI version to activate the developer mode.
3. Back to Settings → Additionally. → For developers.
4. Find the Battery Data Reset and confirm the action.

Once calibrated, autonomy should stabilize, and if the phone still discharges quickly, check the background processes or contact the service (possibly the problem is the board).

8. Should I change the battery myself or contact the service?

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

Self-replacement is justified if:

• 🔧 You already have the tools and experience of disassembling the equipment.
• 📱 Model older than 2020 (easier to disassemble).
• 💰 Budget is limited and battery is urgently needed.

It is worth contacting the service if:

• 🆕 You have a new model (Redmi Note 12, 13) where there is a high risk of damage to the plumes.
• ⚡ The battery is swelling or leaking (dangerous to disassemble on your own).
• 🛡️ You need a job security.

Average replacement cost in the service (2026):

• Redmi 9A/9C — 1 200–1 800 ₽.
• Redmi Note 10/11 — 1 800–2 500 ₽.
• Redmi Note 12 Pro — 2 500–3 500 ₽.

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If you’ve never taken a smartphone apart, but want to try it, practice on an old device or watch your model disassembly on YouTube (Repair Universe or JerryRigEverything channels shoot detailed guides).

FAQ: Answers to Frequent Questions