Replacement of a non-removable battery in the Xiaomi smartphone: detailed instructions with photos and nuances

Non-removable batteries in Xiaomi smartphones are the standard of modern devices, but over time, even the highest-quality battery loses capacity, POCO X3 Or the Mi 11 runs out in a few hours, turns off at 30 percent charge, or the body is swollen, so it's time to think about replacing it. The manufacturer doesn't provide easy access to the battery, but with the right approach, you can do it yourself, saving you money at the service center.

In this article, you'll find a step-by-step photo guide, a list of tools you need, the criteria for choosing a new battery, and key nuances that even experienced craftsmen miss: how to avoid damage to plumes, what to do with glue, and why it's important not to skimp on battery quality, and also, we'll answer the question of whether to risk the warranty for self-repair.

Signs that the battery is time to change

Low autonomy doesn't always mean battery wear, sometimes software failures or application backgrounds are the problem, but there are clear signs that indicate physical wear and tear.

• 🔋 Smartphone discharges by 50% or more in 2-3 hours in standby mode (without active use).
• 📉 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
• 🔥 The body of the device is noticeably swelled (especially in the area of the camera or the lower part).
• ⚡ Charging is interrupted or jerked, even with the original adapter.
• 🛑 The device spontaneously turns off at 20-30% charge and does not turn on without connecting to the network.

If at least two of these signs are present, check the battery status through an engineering menu or an app like AccuBattery.

1. Enter the number ##4636##.
2. Go to the Battery Information tab.
3. Compare the value of the wear level (if any) or Capacity with passport data.

⚠️ Warning: A bloated battery is a risk of fire. If the smartphone case is deformed, do not delay the replacement and do not try to "puncture" the battery! take the device to the service or perform the replacement yourself on the day the problem is detected.

What tools will be needed to replace

To disassemble your smartphone and replace your battery, you'll need a dedicated set of tools, and don't try to do it at hand, because it can damage your plumes or your body.

In addition, the following may be useful:

• 🧲 Magnetic mat or screw tray (so as not to lose small details).
• 🔍 Loop or magnifying glass (to inspect plumes for microcracks).
• 🧴 Double-sided tape or glue B-7000 (If a new battery without adhesive base).

⚠️ Warning: Do not use metal mediators or knives to separate the body! Even a small scratch on an aluminum frame can become a source of corrosion, and damage to antenna lines will lead to a deterioration of the signal.

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Before disassembling, take a picture of the location of all the plumes and screws - this will save hours on the assembly if something goes wrong.

How to choose a new battery: original vs analogues

The quality of the battery is not only the autonomy, but also the safety of the device, and cheap ones can swell, overheat or not match the declared capacity.

1. Original Xiaomi batteries

Pros:

• ✅ Guaranteed capacity matching (e.g., 5020 mAh for Redmi Note 10 Pro).
• ✅ Compatible with fast charging system (if supported).
• ✅ Minimum risk of swelling when properly operated.

Cons:

• ❌ Price 2-3 times higher than analogues (from 1500) ₽ flagship).
• ❌ It is difficult to find free-to-sale (often only through service centers).

2. Quality analogues (recommended brands)

If the original is not available, look for proven brands:

• 🔋 Patona (Germany) - optimal price/quality ratio.
• 🔋 Baseus – popular for models POCO redmi.
• 🔋 ZMI (Xiaomi subsidiary – close to the original in terms of characteristics.

Before buying, check:

1. Matching of battery model (e.g, BM47 Mi 11).
2. Protection against overcharging and short circuit (marking on the body).
3. Reviews about the seller (on AliExpress or markets, look for a rating above 95%).

Step-by-step instructions for replacing the battery

The replacement process can be divided into 5 key steps. Follow the instructions carefully - an error at any step can lead to a broken display or damage to the motherboard.

Stage 1: Preparing and turning off the smartphone

1. Turn off the device and remove it. SIM-memory-card.
2. Discharge the battery to 20-30% (this minimizes the risk of fire if damaged).
3. Remove the back cover (if it is removable as the POCO M3) Or prepare to disassemble the monolithic body.

Stage 2: Separation of the body

For smartphones with adhesive body (most Xiaomi models):

1. Heat the display edge with a hairdryer (temperature 60–80)°C, no higher!).
2. With a suction cup, raise the screen by 1-2 mm and insert a plastic mediator.
3. Carefully drive the mediator around the perimeter, separating the glue. Don't push too hard - plumes pass under the display!

Is the smartphone off?|Whether cards are extracted?|Are there spare screws in case of loss?|Isopropyl alcohol on hand?-->

Stage 3: Disconnecting the plumes and removing the battery

After the display is removed:

1. Unscrew the screws that fix the metal plate over the battery.
2. Disconnect the battery connector with plastic tweezers (not metal!).
3. Tap the battery with a plastic spatula, preheating it to 50-60°C. If the glue is too strong, use isopropyl alcohol to dissolve.

Critical moment: Don't pull the battery by the wires - they are soldered to the board and can come off!

Step 4: Installation of a new battery

Before installation:

• Clean the contacts on the board and the new battery with alcohol.
• Check if the location of the connector matches (sometimes it is mirrored!).
• Apply a thin layer of glue B-7000 perimeter of the battery (if there is no factory adhesive base).

Stage 5: Assembly and inspection

Collect the smartphone in reverse order, paying attention to:

• The density of the plumes fit (they should not hang out!).
• The slack of the screws (do not overdo it - you can tear the thread).
• The performance of the touchscreen and speakers after assembly.

After inclusion:

1. Charge your smartphone to 100% and discharge to 0% 3 times in a row to calibrate the controller.
2. Check the battery life – if it hasn’t improved, there may be an error when connecting the battery.

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The most common mistake when replacing is to damage the plume of the display or camera. If the screen does not work after assembly or the camera gives out artifacts, immediately disassemble the smartphone and check the connections.

Frequent Mistakes and How to Avoid Them

Even experienced wizards sometimes make mistakes that lead to irreversible breakdowns, and this is what you can't do when replacing your Xiaomi battery:

• 🔥 Overheating the case above 80°C, it's going to damage the display and the glue under the battery. Optimal temperature for softening the adhesive: 60-70°C.
• ⚡ Using metal tools to tamper with the battery is a short circuit, just plastic or wooden blades!
• 🛠️ Use force to separate the display -- the touchscreen plumes and the cameras are extremely fragile. If the body doesn't respond, warm it up again.
• 🔋 Installing a battery with a different capacity, such as putting a battery at 4,000 mAh instead of a native 5,000 mAh, will reduce autonomy and can cause a malfunction of the power controller.
• 💧 Use acetone or solvent instead of isopropyl alcohol – they will damage plastic parts and rubber seals.

If after the replacement of the smartphone:

• Not included. → Check the connection of the battery and the power plume.
• It's discharged fast. → Possible malfunction of the charging controller (diagnosis is needed).
• Overheating. → Most likely, the battery is poor quality or damaged thermosensor.

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If after replacing the battery, the smartphone does not hold a charge, try resetting the settings through Settings. → Recovery and discharge → Resetting. Sometimes the battery calibration failure is solved software-based.

Should I change the battery myself or give it to the service?

The decision depends on your experience, smartphone model and budget, so let’s compare the pros and cons of both options:

When it's definitely not worth the risk:

• 📱 You have Xiaomi. 12T, 13 Pro or other flagship model with a complex design (many plumes, cooling system).
• 🔧 No experience disassembling electronics (even replacing the battery in the laptop is not comparable in complexity).
• ⚡ The battery swelled so much that deformed the body – here you need a professional approach.

If you have a Redmi. 9A, POCO X3 NFC Or another “repairable” model, and hands grow from the right place – a self-replacement will save up to 50% of the budget.

FAQ: Answers to Frequent Questions