If you are looking for information about the battery BM47 For Xiaomi smartphones, you’re likely faced with one of two situations: either your phone’s battery is out of order and needs to be replaced, or you want to buy a spare battery for the future. BM47 — It's an internal designation for the battery series that Xiaomi has been installing in its devices since 2018, but here lies the main problem: the same battery model can fit multiple phones, and sometimes even devices from budget Redmi to flagship Mi.
In this article, we will not only list all Xiaomi models that are compatible with the BM47, But we also explain how to check for the right battery for your phone, and you'll learn about the battery's specifications, the typical signs of wear and tear, and where to buy the original replacement and how to avoid counterfeiting. We will pay special attention to the nuances of replacement - from disassembling the body to calibrating the new battery after installation.
What does marking mean? BM47?
abbreviation BM47 It stands for Battery Module, where 47 is the internal code of the series, and this is a notation system used by Xiaomi to unify components. BM47 — This is not a battery model in the usual sense (such as, BL-5J Nokia, but rather a family of batteries with the same physical sizes and connectors, but possible variations in capacity and voltage.
Inside the series BM47 There are subspecies that differ in suffixes (for example, BM47-100 or BM47-200). These suffixes indicate a specific battery revision, which may vary slightly in performance. e.g., the battery for the Redmi Note 8 Pro and Mi 9T visually identical, but have different firmware charge controller, making them interchangeable without adaptation.
- 🔋 BM47 — base series suitable for most models 2018-2020.
- 📏 Size: Standard form factor ~150×70×3.5 mm (may vary slightly).
- ⚡ Voltage: usually 3.85V or 4.4V (depends on the phone model).
- 🔄 Connector: 4-pin connector with protection against improper connection.
One of the key points: batteries BM47 They often come with a pre-glued heat paste on the controller, and it's important to consider when replacing them -- if you're buying a battery without a thermal paste, you'll have to put it on yourself, or the phone will overheat or refuse to charge.
Full list of Xiaomi models with battery BM47
Below is a table with confirmed models of Xiaomi smartphones, which use the battery series BM47. Data is based on official service manuals and device disassemblies. Please note that some models may have alternative battery versions (e.g., battery versions, BM48 regionally modified).
| Model phone | Capacity (mAh) | Voltage (V) | suffix BM47 | Notes |
|---|---|---|---|---|
| Redmi Note 8 Pro | 4500 | 3.85 | BM47-100 | The most common version, suitable for the global and Chinese versions. |
| Xiaomi Mi 9T / Redmi K20 | 4000 | 3.85 | BM47-200 | Identical to Mi. 9T Pro, but with a different charge controller. |
| POCO X3 NFC | 5160 | 4.4 | BM47-300 | Increased capacity, requires the firmware of the controller when replaced. |
| Redmi Note 9S / Note 9 Pro (global) | 5020 | 3.85 | BM47-400 | It is not compatible with the Indian version of the Note 9 Pro Max. |
| Xiaomi Mi 10 Lite | 4160 | 3.85 | BM47-500 | A rare version, often forged. |
If your model is not in the table, it does not mean that it is not exactly used. BM47. Some regional versions (e.g. India or China) may have other designations. To accurately define the battery model, follow the following steps:
Turn off the phone and remove the tray for SIM-map
Remove the back cover (need a mediator or suction cup)
Inspect the battery – the marking is on a white sticker
Compare the code to the table above or search the internet.-->
Some vendors say "suitable for Redmi Note" in the description. 8/9/10", But it's actually about different audits. BM47. For example, a Note battery 8 Pro physically fits into Note 9S, But the phone will not charge it because of a mismatch of the controller data, BM47-400)!
How to distinguish the original BM47 forgery?
Xiaomi’s battery market is flooded with fakes that not only fail quickly, but can cause a fire or battery to bloat. BM47:
- 🏷️ Sticker: should be matte, with a clear font and a hologram of Xiaomi (when changing the viewing angle, a rainbow effect appears).
- 🔍 Serial number: the original number matches the number indicated on the box (if you buy in the package).
- ⚖️ Weight: The original battery weighs ~100-120 g (fakes are often 20-30 lighter%).
- 🔌 Connector: in the original contacts are gold colored, on fakes - copper or covered with dull alloy.
Critical: fake batteries often have understated real capacity. For example, a battery with a declared 5,000 mAh actually produces 3,000-3500 mAh, which leads to a sharp reduction in the phone’s life. You can check the real capacity using applications like AccuBattery (but only after 3-5 full charge cycles).
Another way to test is to test the heat. BM47 When charged intensively (for example, with Quick Charge 3.0) heats evenly and does not exceed 40-45°C. Counterfeiting often overheats to 50-60°C, which can be felt with the hand or fixed through AIDA64.
💡
Before you buy, ask the seller to send a photo of the sticker with the serial number and hologram. mi.com/global/verify (section").
Signs of battery wear BM47: time to change?
Average battery life BM47 It's 300 to 500 full charge cycles (approximately 2-3 years with active use), but the actual wear and tear depends on the operating conditions: frequent overheating, charging with "cheap" adapters or discharge to 0% reduce battery life by 1.5 to 2 times. BM47 replacement:
- 🔋 Fast discharge: the phone loses 20-30% of its charge in 10-15 minutes without loading.
- ⚡ Unstable charging: the percentage of charge "jumps" (for example, from 50% immediately to 20%).
- 🔥 Overheating: the phone body becomes hot even with light load.
- 📉 Bloating: The back cover starts to "step away" or the screen lifts.
- ⏳ Long charging: from 0% to 100% for more than 4-5 hours (with a serviceable adapter).
The last point is particularly dangerous: battery bloating. If you notice that the back of the phone is arching or there is a gap between the body and the screen, immediately turn off the phone and remove the battery. Li-ion batteries that are billowing can spontaneously ignite when mechanically impacted (for example, if the phone sits or falls).
⚠️ Attention! If the battery is swelling, don't try to puncture or compress it. Lithium-ion cells, when damaged, emit toxic gases and may ignite.
Applications can be used to diagnose wear:
- AccuBattery shows the actual capacity and number of charging cycles.
- AIDA64 — displays battery temperature and voltage.
- 3C Battery Monitor – analyzes the current of discharge and charge.
How to check the capacity without programs?
Step-by-step instructions for replacing the battery BM47
Replacement of the battery in smartphones Xiaomi with BM47 If you've never disassembled a phone, you'd better go to a service center -- errors in replacement can damage the plumes or the motherboard. But with experience, it's as difficult as replacing the battery on an iPhone.
You'll need:
- 🔧 Plastic mediator or guitar mediator (to separate the body).
- 🔨 Cross screwdriver (usually) PH00).
- 🧲 Screen suction cup (optional, but simplifies the process).
- 🔥 Hair dryer or thermo-air station (for softening glue).
- 🧴 Isopropyl alcohol (to clean glue residues).
Procedure:
- Turn off the phone and remove the tray for SIM-map.
- Heat the back cover around the perimeter (temperature ~60 ° C) for 1-2 minutes.
- Insert the mediator in the gap between the body and the cover and gently walk around the perimeter.
- Unscrew the screws that fix the metal plate over the battery.
- Disconnect the battery connector from the motherboard (use a plastic tool!).
- Put the battery in the sleeve (do not use metal objects!).
- Install a new battery, plug in the connector and assemble the phone in reverse order.
⚠️ Attention! When you disconnect the battery connector, don't pull the wires, it can take the contacts off the board. Always put the connector on the side with a plastic tool.
After replacing the battery, you must calibrate:
- Charge your phone to 100% and hold on charging for another 1 hour.
- Turn off the charging and discharge the phone until it automatically shuts down.
- Repeat the charging-discharge cycle 2-3 times.
This will help the power controller to correctly determine the new battery capacity.
1. Correct connection of the battery connector.
2. Presence of damage to the plume.
Model compatibility BM47 with your device (see table above).-->
Where to buy the original battery BM47?
Buy a battery BM47 The best way to avoid counterfeiting is from official sources:
- 🏬 Xiaomi service centers: guaranteed original battery, but the price is higher than the market by 20-30%.
Average price for the original BM47 (2026):
- Redmi Note 8 Pro: 1200–1500 ₽
- POCO X3 NFC: 1500–1800 ₽ (because of the increased capacity)
- Mi 9T: 1300–1600 ₽
When buying on AliExpress, pay attention to the following details:
- 📦 Packaging should be sealed, with a hologram Xiaomi.
- 📋 Instructions must be in Chinese/English.
- 🔄 The seller must provide a guarantee of at least 6 months.
⚠️ Avoid vendors who offer "universal" batteries for "all Xiaomi models" and are almost always fake batteries with low capacity and can damage the phone's charging controller.
Frequent errors in replacement BM47 and how to avoid them
Even experienced users sometimes make battery replacement mistakes that lead to additional problems, and the most common ones are:
- 🔌 Incorrect disconnection: if you pull the battery plume out with force, you can tear off the contact pads on the motherboard. Always pull the connector on the side!
- 🔥 Ignoring thermopaste: If you don’t apply it to the new battery controller, the phone will overheat and shut down when charging.
- 🧲 Use of metal tools: a mediator or screwdriver can puncture the battery, which will lead to a short circuit.
- 📉 Uncalibrated battery: Without proper calibration, the phone will show an incorrect percentage of charge (e.g., shut down by 30%).
- 🔋 Buying a battery without checking the suffix: for example, installing BM47-100 instead BM47-400 will cause a charging error.
One of the most insidious mistakes is that the flexible plume of the screen is damaged when the back cover is removed. In Xiaomi models, the plume often passes under the battery and is easily hit by the tool, and if the phone does not respond to touch or the screen flashes, the plume is likely damaged. In this case, it will be necessary to replace it (cost). ~800–1500 ₽).
After the battery is replaced, some Xiaomi models (for example, POCO X3) They can give you a warning, "Non-original battery." It's not critical -- the phone will work fine, but fast charging may be limited. To remove the warning, you need to reset the settings through Settings. → The phone. → Resetting settings (does not delete data).