Replacement of the battery on Xiaomi smartphones: from battery selection to assembly

The battery is one of the most vulnerable components of the smartphone. even the flagship models Xiaomi through the 2-3 During the year of active use, the battery capacity may decrease by 30-50%, This leads to quick discharge, sudden blackouts and charging problems. 10 pro POCO X5 began to “live” from the socket to the socket, and the original battery is no longer able to cope – it’s time to think about replacing it.

In this article, we’ll take a look at the entire process, from fault diagnosis to final build, how to pick up the right battery (to avoid getting a fake), what tools you’ll need to disassemble, and how to avoid the typical errors that cause damage to the board or display, and also how Xiaomi might “not see” the new battery after replacing it and how to fix it.

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

Before you start the screwdriver, make sure the battery is the problem, and here are the symptoms of critical wear that are not related to software failures or the charger:

• 🔋 The smartphone is running out of power. 20-30% an hour in standby mode (with the screen off and background applications).
• ⚡ Charging jumps: for example, shows 40%, then drops sharply to 15%, and after a minute again “restores” to 30%.
• 🔌 The phone goes off when 10-20% although it had previously been used before 1-2%.
• 🌡️ The battery is very hot even with minimal load (for example, during a call).
• 📉 The Autonomous Work Time has been reduced in 2-3 Compared to a new device (e.g. Xiaomi) 11T Pro had previously held 1.5 day and now — 6-8 hours).

If at least 2-3 You know the item on the list, the battery definitely needs to be replaced, but before you order a new one, check its condition through the engineering menu:

1. Open the Phone app and enter the combination ##4636##.
2. Go to the Battery Information section.
3. If you look at the Health Level, if it's below 70%, the battery is replaced.

⚠️ Note: If the Xiaomi smartphone suddenly turns off when 30-50% It's a charge, but after rebooting, it shows normal levels, which is a sign of a swelling of the battery, and in this case, you need to replace it immediately, because the bloated battery can damage the screen or motherboard.

What battery to choose for Xiaomi: original vs analogues

The quality of the battery is not only the time of operation, but also the safety of the device, and cheap fakes can swell in a month or even ignite when charging.

1. Original Xiaomi batteries

The best option is a battery labeled Xiaomi Original or Mi Original Battery.

• 🔄 Guaranteed compatibility with the power controller (no errors like “Unoriginal battery»).
• 📊 Accurate data on capacity and level of wear in MIUI.
• ⚡ Optimized fast charging (e.g. Fast Charge 4.0)+ or HyperCharge).

Where to buy: official Mi Store, authorized service centers or trusted sellers on AliExpress (with a rating above 98% and reviews with photos), the average price is from 1,500 to 3,500 rubles depending on the model.

2. Qualitative analogues

If the original can not be found, pay attention to the brands:

• 🔋 Baseus – reliable batteries with protection against overheating, suitable for most models of Redmi and POCO.
• 🔌 Remax – budget option, but with a guarantee of 6 months.
• 📱 ZMI (Xiaomi subsidiary – almost original quality at the price of the 20-30% below.

When buying an analogue, be sure to check:

• 📋 Battery model (e.g, BM47 for the Redmi Note 9 Pro or DM-09 Mi 11 Lite).
• 🔢 Capacity – must match the original (for example, 5020 mAh for POCO X3 Pro).
• 🔍 Controller (the battery board should have a chip, not just contacts).

⚠️ WARNING: If you buy a battery on AliExpress or Wildberries, pay attention to the weight.The original Xiaomi battery weighs on the battery. 10-15% more counterfeiting (e.g., more counterfeiting, 5020 Must be a mAh. ~100 d. 80 s).

Battery Replacement Tools: What You Need

To disassemble the Xiaomi smartphone and replace the battery, you will need:

Plastic blades (mediators) for the separation of the back cover|Set of screwdrivers (cross, star) T3-T5, flat)|Screen suction cup (if you need to remove the display)|Tweezers with curved ends|Hair dryer or thermo-air station (for softening glue)|Isopropyl alcohol (90%+) clean-up|New battery with double-sided tape|Thin gloves (optional, to protect against static electricity)-->

Some models (e.g. Xiaomi 12 Pro or XP) POCO F4 GT) They have additional protection, metal latches or high-strength adhesives:

• 🔧 Special key for spinning tripod screws (available in iPhone repair kits).
• 🔥 Thermopaste for the processor (if you have to disconnect the radiator).
• 🧲 Magnetic mat - so as not to lose small screws.

If you've never taken a smartphone apart, practice on an old device or watch your model's disassembly on YouTube, such as the Redmi Note 8 Pro and the Redmi Note 8 Pro. POCO X3 NFC The process is very different due to different battery mounts.

💡

Before disassembling, take a picture of the location of all screws and plumes - this will help to properly assemble the smartphone back. NFC-antenna in the cover (e.g., Mi) 10T).

Step-by-step: how to change the battery on Xiaomi

The replacement process can be divided into 5 steps. We will look at the universal scheme, but note that for some models (for example, Xiaomi Mix Fold or Black Shark) there may be nuances.

1.Switching off and preparing the smartphone

Before the disassembly:

1. Turn off the phone and remove it. SIM-map + memory card (if any).
2. Discharge the battery to 20-30% – this will reduce the risk of fire in case of accidental circuit.
3. Remove the back cover (if it is removable, like Redmi's). 9C) Or warm up the hair dryer of the edge of the body (for glue models).

Removal of the back cover

For models with glue fixation (most modern Xiaomi):

1. Warm up the hair dryer of the edge of the body around the perimeter (temperature) ~60°C, no higher!).
2. Insert the plastic blade into the gap between the lid and the frame (start at the bottom edge where the charging connector is).
3. Carefully drive the blade along the body, separating the glue. If the lid does not lend itself, warm up again.

⚠️ Do not use metal tools – they can leave scratches or damage antenna tracks under the lid.

3. Battery disconnection

After the lid is removed:

1. Unscrew the screws that fix the metal plate above the battery (if any).
2. Carefully disconnect the battery plume from the motherboard (use a plastic spatula, not tweezers!).
3. If the battery is glued, put it on the ears (white or black ribbons on the sides), and if there are none, warm up the bottom of the battery with a hair dryer and gently smack it with a spatula.

Installation of a new battery

Before installation:

• Clean the contacts on the motherboard and new battery with isopropyl alcohol.
• Remove the protective film from the adhesive base of the new battery (if any).
• Connect the battery plume to the board and lock it (sometimes a light tap before a click is required).

Stack the battery smoothly, without skewing. If you have double-sided tape, stick it around the perimeter of the battery for additional fixation.

5. Assembly and inspection

Collect the phone in reverse order:

1. Install the back cover and warm it up with a hair dryer to activate the glue (if the cover is glue).
2. So, turn all the stains (not to be worn).
3. Turn on your smartphone and check:

• 🔋 Charge level (must be displayed correctly).
• ⚡ Quick charging (connect the original RAM).
• 📶 Network signal and Wi-Fi (sometimes after disassembly, antenna plumes depart).

(1) The density of the battery plume adjacent to the socket on the board.

(2) Integrity of contacts (possibly bent pin).

3) Correct connection of the display plume (in some models it blocks power in case of non-dense contact).-->

Common Mistakes When Replacing a Battery and How to Avoid Them

Even experienced craftsmen sometimes make mistakes that lead to a smartphone breakdown.

1. Overheating of the battery with a hairdryer - if the temperature is higher 70°C, the battery may deform or even explode.Use a thermometer or keep a hair dryer at a distance 10-15 centimeter.
2. Damage to the plume of the display - on Xiaomi models with AMOLED-screens (e.g. Mi 11 or POCO F3) The plume is very fragile. Don't bend it or put tools on the plume.
3. Using a non-original glue -- cheap Scotch can fall off in a week, and the battery will hang around inside the case. 3M tesa.
4. Forgot to calibrate the battery, and after you replace it, the smartphone may show an incorrect charge level.

1. discharge the phone before automatically shutting down.


2. Connect the original RAM and charge 8-10 hours without interruptions.




3. Turn off charging, turn on the smartphone and wait for complete discharge.




4. Repeat the charging-discharge cycle 2-3 times.

Another common problem is the error "Unoriginal battery" in the MIUI. It appears when the power controller doesn't recognize the new battery:

• 🔄 Reboot your smartphone – sometimes the error disappears after a reboot.
• 📱 Update. MIUI Up to the latest version (new firmware expands the list of supported batteries).
• 🔧 If nothing helps, you will have to flash the power controller through Fastboot (this is a complicated procedure, it is better to contact the service).

How much does it cost to replace the battery in the service vs independently?

If you're not sure about your abilities, you can go to the service center, and here's an estimate for 2026.

Self-replacement is cheaper, but consider the risks:

• 💸 Savings: 1000-2 500 rubles (due to lack of payment for work).
• ⚠️ Risks: damage to the display, motherboard or antenna (especially on models with a metal body, such as the Mi 10).
• ⏳ Time: first time disassembly can take 1.5-2 hours (in the service - 30-40 minutes).

If you decide to change the battery yourself, start with a budget model (e.g. Redmi). 9A or POCO M3) — Their design is simpler, and the risk of damage to something expensive is minimal.

What to do after replacement: Calibration and care for the new battery

To make the new battery last longer, follow these guidelines:

1. Battery calibration

As we mentioned, after the replacement, you need to train the power controller.

1. Charge your phone to 100% and hold on charging for another 1-2 hours.
2. Turn off charging and use your smartphone before automatically turning off.
3. Repeat the process. 2-3 once.

2. Optimization of settings MIUI

Turn on these features to extend battery life:

• 🔄 Adaptive charging (Settings) → Battery → Battery settings – limit charge to 80% at night.
• 📵 Background Limitation for Power-Hungry Applications (e.g. TikTok or Genshin Impact).
• 🌙 The dark subject is on AMOLED-The screen saves up to 15% of the charge.

3. Proper charging

Modern lithium-polymer batteries do not have a “memory effect”, but still require careful handling:

• 🔌 Use original or certified RAM (e.g. Xiaomi) 33W or Baseus 65W).
• 🔥 Do not charge your phone at temperatures below 0°C or higher than 40°C.
• 📵 Avoid full discharge - it is better to recharge when 10-20%.

1) Are not power-intensive functions included (e.g., Continuous search) GPS or high-resolution camera).

2) Are there any background processes that "eat" charge (check in Settings → Battery → Battery utilization).

3) Whether the battery is properly installed (sometimes poor plume contact leads to increased power consumption).-->

FAQ: Frequent questions about replacing the battery with Xiaomi