Replacement of the battery on Xiaomi Redmi: from disassembly to the first inclusion

Xiaomi Redmi smartphones are known for their value for money, but even the most reliable batteries lose capacity over time. If your device starts to run out in a few hours, turn off at 20-30% charge or overheat during charging, it’s time to think about replacing the battery. In this article, we will discuss the step-by-step process of replacing the battery on the popular models of Redmi Note 10/11/12, Redmi 9/10/13C and others released after 2018.

The procedure requires precision and basic electronics skills, but with the right approach, it can be done on your own without going to the service center. We will tell you what tools you need, how to safely disconnect the plumes, avoid damaging flexible cables and properly connect the new battery. Particular attention will be paid to models with adhesive battery mounting (for example, Redmi Note 11 Pro+), where a special approach is required.

Important: If you've never taken a smartphone apart, practice on an old device or watch video instructions for your particular model. Some steps (like working with glue or soldering contacts) may seem complicated, but with our detailed instructions you can cope!

1.Preparation: tools and safety

Before you start, make sure you have everything you need, and using the wrong tools can damage the body, display or motherboard, and here is the minimum set you'll need:

• 🔧 Plastic blades (2-3 (a) - for the careful liding and disconnection of the plumes
• ⚒️ Set of screwdrivers (cross-haired) PH00, five-beam Y00, flat-footed 1.5 mm)
• 🔥 Hair dryer or heating station - for softening the glue (temperature) 60-80°C)
• 🧴 Isopropyl alcohol 90%+ — glue-residue
• 📦 New battery – check compatibility with the model (e.g, BM4X For the Redmi Note 10 Pro)
• 🧲 Magnetic mat - so as not to lose the screws

Also prepare the workspace: it should be well lit, without dust or moisture.Use an antistatic bracelet or periodically touch a grounded metal object to avoid static discharge, which can damage the motherboard.

⚠️ Warning: Never use metal blades to tweak the battery - this can cause short circuit! glue on the battery of some models (for example, Redmi Note 12 Pro)+) It is very durable and its removal requires patience.

2.Switch off the smartphone and remove the back cover

The first step is to shut down the power completely. Turn off the phone and remove it. SIM-If the battery is swelling, don't try to turn it on, it's dangerous! Then you have to remove the back cover. Most Redmi models have it on the latches and glue, so you have to be careful:

1. Heat the lid edge with a hair dryer (especially near the buttons and USB connector) for 1-2 minutes.
2. Insert the plastic blade into the gap between the lid and the body (start at the bottom edge where the charging connector is).
3. Carefully drive the shoulder blade along the perimeter, gradually snapping the clamps.

In the Redmi Note 11S and later, the lid can be attached with additional screws under plugs (usually near the camera), which must be carefully tucked and unscrewed with a five-pointed Y00 screwdriver.

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If the cover does not lend itself, warm it up again with a hair dryer - the glue becomes elastic at a temperature of 70-80 ° C. Do not overheat: the maximum temperature for plastic is 100 ° C.

3. disconnection of the plumes and removal of the old battery

When you take the lid off, you'll see the battery covered with black film, and before you touch it, disconnect the battery from the motherboard.

1. Find the battery plume (usually located at the top of the board, next to the charging connector).
2. With a plastic spatula, gently slap the connector and unplug it.
3. If the plume is glued, drop a little isopropyl alcohol on the glue and wait 10 seconds.

Now you can start removing the battery. Redmi models use two types of attachment:

For models with adhesive stripes (like the Redmi Note 10), pull the black tapes under the battery. If they break, use a plastic spatula, putting the battery on the edges. Be careful: don't deform the battery - this can lead to fire!

Installation of a new battery

Before installing the new battery, clean the seat of glue residue with isopropyl alcohol. Make sure the contacts on the motherboard and battery plume are clean and not oxidized.

The new battery is compatible with the model

Contacts on board and plume are clean

The stainless stains (if any) are properly placed.

All screws and latches in place.-->

1. If the battery is complete with adhesive strips, glue them to the body according to the instructions.
2. Carefully put the battery in place, making sure that it lies flat, without distortions.
3. Connect the plume to the motherboard. It should snap with a slight click.
4. Secure the battery (screws, if it is provided by the design).

For models with adhesive layer (for example, Redmi Note 12 Pro+), use double-sided tape or special glue B-7000. apply it with a thin layer around the perimeter of the battery, avoiding contact.

⚠️ Warning: If the battery is not activated, check: Is the plume properly connected (sometimes it is inserted "upside down"). Is there any damage to the board contacts (oxidation, pollution). Is the wires closed somewhere (check the multimeter).

5. Build the phone and first turn on

After installing the battery, collect the phone in reverse order:

1. Make sure all plumes (display, cameras, buttons) are connected.
2. Lay them carefully, without overburdens.
3. Secure the back cover starting at the top (near the camera).
4. Tighten the screws (do not drag - this can damage the thread!).

Before final assembly, check the performance:

• 🔋 Connect the charger - a charging indicator should appear.
• 📱 Press the power button – the phone should turn on (perhaps longer than usual).
• 🔍 Check the sensor, cameras and speakers for performance.

If the phone doesn't turn on, take it apart again and check all connections. Sometimes resetting settings via Fastboot mode helps (hold Power + Vol Down when you turn on).

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After the battery is replaced, it is recommended to perform 2-3 full charge/discharge cycles (0% to 100%) to calibrate the battery controller.

6. Battery calibration and performance optimization

The new battery requires calibration to ensure that the charge controller correctly determines the level of charge.

1. Charge your phone to 100% and leave it on charge for another 1-2 hours.
2. Turn off the charger and use the phone until it is completely discharged (before it is turned off).
3. Repeat the process 2-3 times, which will help synchronize the controller data.

To extend the battery life:

• 🔌 Avoid charging to the point (it is better to keep the charge between 20% and 80%).
• ❄️ Do not use your phone in extreme temperatures (below 0)°C or higher than 40°C).
• 🔄 Turn off Adaptive Charging in Settings (Settings) → Battery, if any.

Redmi models with MIUI 14+ have a built-in battery optimization feature to enable:

1. Go to Settings → Battery and Performance → Battery Settings
2. Activate the Smart Optimization option.
3. Turn on the power saving mode at low charge.

7. Frequent mistakes and how to avoid them

Even experienced tycoons sometimes make mistakes when replacing the battery, and here are the most common problems and solutions:

If the battery runs out in a few hours after replacing, you may have installed a fake or used battery. Check its capacity using the AccuBattery app (available on Google Play). The normal capacity of the new battery should be at least 95% of the declared one (for example, 4900 mAh for a 5000 mAh battery).

Another common mistake is using metal tools to tamper with the battery, which can short-circuit and cause the motherboard to fail. Always use plastic or wooden blades!

FAQ: Answers to popular questions