How to change the battery in the smartphone Xiaomi: a complete guide with photos and videos

Why Xiaomi’s battery fails and when to change it

Xiaomi smartphones are some of the most popular on the market due to their price-performance ratio, but even they are not immune to battery wear. On average, lithium-ion batteries lose up to 20% of their capacity after 300-500 charging cycles. If your Redmi Note 10 or Poco X3 Pro runs out in a couple of hours, turns off at 30% charge or overheats during charging, these are sure signs that the battery needs to be replaced.

The manufacturer claims a battery life of 500-800 cycles, but in practice this figure depends on the operating conditions. Rapid charging, overheating, the use of low-quality chargers and constant discharge of up to 0% accelerate degradation. For example, the Mi 11 Series models with support for 120W HyperCharge wear out faster than the budget Redmi 9A with 10W charging.

How do you know it’s time to change the battery?

• 🔋 The phone's emptying on 50% post 1-2 hourly with moderate use
• 🔥 The body is noticeably heated in the battery area even without loading.
• 📉 In settings (Settings) → Battery → Battery condition) capacity shows less than 80% of the original
• ⚡ Charging is interrupted or the phone is disconnected when connected to the network
• 💥 The battery is swollen (seen on the raised screen or back cover)

Which battery to replace: original vs analogues

The first step is to determine the type of battery. Xiaomi’s original batteries are marked with a code that begins with MB- (for example, MB-J20 for the Redmi Note 8 Pro), their advantages: guaranteed compatibility, correct work with firmware and charge sensors. Cons: high price (1500 to 4000 rubles) and the risk of running into a fake.

Alternatively, certified analogues from ZMI, Baseus or Remax. They are cheaper (from 800 rubles), but require verification:

• 🔍 Check the marking: must match the original (e.g, 4400mAh 3.85V POCO F3)
• 📦 The packaging must contain QR-code, hologram and certificate
• 🔧 Battery contacts should not be oxidized or bent.
• 📏 The thickness and shape should match perfectly with the native battery.

⚠️ Warning: AliExpress batteries at a price 300-500 They are almost always fake, they may have an understated capacity (for example, for example, 3000mAh instead of the stated 5000mAh) or improper voltage, which will damage the smartphone power controller.

Preparing for replacement: tools and safety

To replace the battery in Xiaomi, you will need:

• 🔧 Screwdriver kit: Phillips #00, Torx T3/T4, plastic mediator
• 🔥 Hair dryer or thermo-air station (for softening glue)
• 🧲 Screen suction cup (optional, for models with removable display)
• 🛠️ Plastic shoulder blades or guitar mediators
• 🔌 Multimeter (to check the voltage of the new battery)

Important: Before disassembling, completely discharge the phone (before turning off automatically) – this minimizes the risk of short circuits, and prepare the workplace: a clean desk, good lighting and an antistatic mat (or at least do not work on a carpet that stores static electricity).

Make a backup copy of the data|Disable Find My Device in your Mi Account|Prepare tools|Discharge the phone to 0%|Wear an antistatic bracelet (optional)-->

⚠️ Note: If your Xiaomi has a glued screen and body (like the Mi 11 Ultra or Redmi) K40), Replacing the battery on your own can damage the display.

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

The replacement process varies depending on the model, but the overall scheme is as follows:

Step 1 Remove the back cover

On most Xiaomi models (such as the Redmi Note 9 or Poco X3), the back cover is mounted on latches and glue. Warm up the edge of the case with a hair dryer (60-70°C) for 2-3 minutes, then gently tuck in with a plastic mediator. Start at the bottom edge where the charging connector is located.

Step 2. Turn off the plumes.

Once you remove the lid, you'll see the battery glued to the case. Before you remove it, turn off the battery -- find a small connector on the motherboard that says BATTERY or JST and gently tuck it in with a plastic spatula. Never tear the battery off without disconnecting it from the board -- it could burn the power controller!

Step 3: Remove the old battery

The battery is glued to a double-sided tape, pick it up by a special black film (traction loop) and slowly pull, while heating the body with a hairdryer. If there is no loop (as in the Mi 10T), use a plastic blade, but do not press too hard - you can puncture the battery!

Step 4: Installation of a new battery

Before installing, check the voltage of the new battery with a multimeter - it should be within 3.7V-4.2V. glue the battery to a new double-sided tape (for example, 3M 9448A) and connect the plume to the motherboard.

Step 5: Build the phone

Before you close the lid, check the operability: connect the charger and make sure the phone turns on and correctly determines the charge level. If after assembly the screen does not respond to touch, check if the plumes are compressed.

Calibration of the new battery and setting up the phone

After replacing the battery, Xiaomi may not display the percentage of charge correctly. To avoid this, calibrate:

1. Charge your phone to 100% and leave it on charge for another 1-2 hours.
2. Turn off charging and use the phone until it is completely discharged (until it automatically shuts down).
3. Repeat the charging-discharge cycle 2-3 times.

It is also recommended to reset the battery data in the engineering menu:

1. Enter the dialer code: ##4636##
2. Select Battery Information.
3. Click Reset Statistics (if there is no such option, skip the step).

For models with MIUI 12+, check the optimization settings:

• Go to Settings → Battery → Battery settings.
• Turn off Adaptive Charging (if enabled).
• Enable Optimized Charging to extend the service life.

💡

If your phone runs out quickly after you replace the battery, check the background in Settings → Battery → Battery Use. Often, apps like Facebook or Instagram are to blame, which consume even in the background.

Frequent Mistakes and How to Avoid Them

Even experienced users make mistakes when replacing batteries.

Another common problem is that a new battery will blow up in a few months, and it's because of:

• 🔌 Use of low-quality chargers (especially with AliExpress)
• 🌡️ Overheating of the phone (games, sunlight, charging while in use)
• 🔄 Frequent cycles of complete discharge (it is better to keep the charge between 20% and 80%)

💡

If after replacing the battery, the phone became worse to hold charge than the old one, chances are you bought a fake.The original Xiaomi battery should last at least 400 cycles when properly operated.

Should I change the battery myself or contact the service?

Self-replacement of the battery in Xiaomi is cheaper (from 800 rubles per battery + tools), but has risks:

• ✅ Pros: Saving money (in the service, the replacement will cost in the 2000-5000 ruble)
• ✅ The ability to choose a high-quality battery itself
• ❌ Cons: Risk of damaging plumes, screen or motherboard
• ❌ Loss of warranty (if the phone is under warranty)

It is worth contacting the service if:

• 📱 You have a model with a glued screen (Mi 11, Redmi) K50)
• 🔧 You've never taken your phones off before.
• 💰 Phone expensive (like Xiaomi 13 Pro or Black Shark 5)
• ⚡ The battery swelled and deformed the body

Average replacement prices in services (2026):

• Redmi 9/9A/9C: 1500-2000 RUB
• Poco X3/X4: 2000-2500 rubles.
• Mi 11/12 Series: 3000-4000 rubles.
• Black Shark 4/5: 4000-5500 rubles.

⚠️ Note: If you decide to change the battery yourself, take a picture of each step of disassembly - this will help to properly assemble the phone back. It is especially important to remember the location of small plumes and screws (in Xiaomi, screws of different lengths are often used!).

FAQ: Answers to Frequent Questions