If you're looking for a BN30 battery for Xiaomi smartphones, this is the right one. This type of battery is used in several popular models of the brand, but it's not always easy to determine whether it will be right for your device. In this article, we'll not only list all compatible phones, but also tell you how to distinguish the original battery from a fake, where to buy it at the best price, and give you step-by-step instructions for replacing it - with nuances that are not talked about even in service centers.
It's important to understand that the BN30 is not just a marketing label, but a specific battery model with fixed performance: 3,000 mAh, 3.85 V and fast charging support. However, even among the original batteries, there are revisions with different controllers, which can affect compatibility. We analyzed the data from the manufacturer, user reviews and technical documentation to create the most accurate guide.
List of Xiaomi phones with BN30 battery
The BN30 battery was officially installed in the following Xiaomi models (including the global and Chinese versions):
- 📱 Xiaomi Mi 5 (all modifications including Mi 5 Pro and Mi) 5s)
- 📱 Xiaomi Mi 5s Plus (except for battery versions) BN31 for certain regions)
- 📱 Xiaomi Mi Note 2 (standard version only, Mi Note 2 Special Edition has a different battery)
- 📱 Xiaomi Mi Max (First Generation, Mi Max) 32GB/64GB/128GB)
- 📱 Xiaomi Mi Max Prime (modification with the 4GB RAM/128GB)
Note that in some regions (e.g. India or Europe) devices with a BN31 or BN32 battery may have been shipped – they look similar but have a different capacity (3200 mAh and 3400 mAh respectively) to avoid error, check the labeling on the old battery or use the AIDA64 app for diagnostics.
The BN30 battery may also be suitable for some Redmi and POCO devices released in 2016-2017, but additional testing is required here. For example, the Redmi Pro and Redmi Note 4 (MTK) sometimes come with similar batteries, but their controllers may conflict with Xiaomi’s power system.
BN30 Technical Specifications: What You Need to Know Before Buying
Before you order a new battery, check its key parameters. The original BN30 battery has the following characteristics:
| Parameter | Meaning | Note |
|---|---|---|
| Capacity | 3000 mAh (±5%) | Real capacity can be 2950–3050 mAh due to production tolerances |
| Tension. | 3.85 In | Nominal; maximum 4.4 V |
| Type of element | Li-Polymer (lithium-polymer) | Not compatible with Li-Ion batteries! |
| Sizes. | 68.5 × 60.5 × 3.85 mm | Thickness tolerance - ± 0.1 mm |
| Weight. | 45-47 g | Counterfeiting is often easier by 5-10g |
Critically, if you see a battery labeled BN30 but with a capacity of 4,000 mAh or higher, it's 100% fake. The manufacturer has never released such modifications. Also, look at the charging controller: the original uses a Texas Instruments BQ27541 chip, and the copies use cheap counterparts without overheating protection.
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Before you buy, ask the seller to provide a photo of the battery label. QR-code that can be checked through the Mi Verify service.
How to distinguish the original BN30 from a fake: 5 key signs
Xiaomi’s parts market is flooded with counterfeits, and batteries are no exception.
- Packaging: The original comes in a white box with a Xiaomi hologram, barcode and production date.The fakes are often packaged in plastic or boxes without branding.
- Labels should be on the label: 🔹 Xiaomi logo (not blurred!) 🔹 Model: BN30 or MBJ406500 (substitute-signature) 🔹 Serial number (12-14 characters) 🔹 QR-check-in
Contacts.
+
–
BMS
NTC
NTC
Weight and size.
45-47 g
40g
Price.
BN30
1500–2500 ₽
1000 ₽
If you have already bought a battery, check it with a multimeter:
- Set the voltage measurement mode (20V DC).
- Connect the probes to the + and - contacts.
- The voltage should be in the range of 3.7-4.2 V. If it shows 0 V or > 4.3 V, the battery is faulty.
- Make sure all the plumes are connected (especially the touchscreen and speaker) and press the back cover and warm up the dryer for better glue fixation.
1. Charge the phone to 100% and hold on charging 1-2 hours.
2. Turn off charging and use the phone until full discharge (before switching off).
3. Repeat the cycle 2-3 times, which will help the controller to correctly determine the capacity.-->
Frequent problems after BN30 replacement and their solution
Even if you did everything right, you might have problems.
| Problem. | Possible cause | Decision |
|---|---|---|
| Phone's off. | Unconnected battery plume or damaged board | Check the connection of the plume, try to charge for 30 minutes |
| It's discharged fast. | Poor battery or calibration not performed | Check the battery with a multimeter, perform calibration |
| No charge is determined | Controller or plume damaged | Try another RMS, check the contacts on the board |
| Overheating during charging | Fake battery or damaged thermistor | Turn off fast charging in settings, replace the battery |
If the phone turns on after the replacement, but it shows a capacity of 100% at the actual 20%, the problem is in the controller, in which case resetting the settings through Recovery will help:
- Turn off the phone.
- Press the Power + Volume Up before the Mi logo appears.
- Choose Wipe & Reset → Wipe All Data.
- After restarting, calibrate the battery.