If you use a smartphone from Xiaomi and see “BN46” printed on your battery or listed online, this code refers to a specific battery model compatible with certain Xiaomi phones.
This blog post will explain what “BN46” Battery Model Name means, which phones use it, its technical specifications, how to recognise a genuine battery, and guidelines for safe battery care.
What “BN46” Means
The code “BN46” is a technical model or part number used for a specific battery designed for certain Xiaomi smartphones.
A BN46 battery is a Li-ion or Li-polymer unit with a capacity of about 3900 mAh (≈ 15.0 Wh) and a nominal voltage of 3.85 V. It helps users, retailers, and repair technicians identify the correct replacement part since many Xiaomi models share similar internal battery designs.
According to multiple battery retailers, BN46 batteries typically carry safety and compliance certifications such as CE, UL, and RoHS, indicating they meet established manufacturing and safety standards.
Which Xiaomi Phones Use BN46
The BN46 battery is commonly listed as compatible with several Xiaomi smartphones, including the Redmi Note 8, Redmi 7, and Redmi Note 6, with some sellers also adding models like the Redmi Y3 to the compatibility list.
Because listings can vary between retailers, it’s important to verify both the battery part number and the exact device model before buying.
Minor hardware revisions or manufacturing changes can cause slight differences between BN46 battery batches such as voltage tolerances or cell suppliers so matching the part code precisely is always recommended.
BN46 battery Specifications
Chemistry / Type: BN46 battery typically uses lithium-ion (sometimes lithium-polymer) chemistry.
Nominal Voltage: 3.85 V.
Capacity: around 3900 mAh (≈15.0 Wh).
Charge Limit Voltage (recommended): approximately 4.4 V.
Typical Use: primary battery for compatible Xiaomi smartphones.
Because the capacity is nearly 4000 mAh, a BN46 battery provides decent operating time, good enough for daily usage in phones such as Redmi Note 8 or Redmi 7 which were designed around this battery capacity
Why Battery Model Names Matter
Battery model names matter because even if two batteries have similar specifications, the exact fit and connector layout must match the device to avoid installation issues or damage.
Phones are calibrated for specific battery characteristics such as internal resistance, cell configuration, and power management profiles. Using a battery with the wrong part number can lead to inaccurate charge readings, reduced lifespan, overheating, or rapid draining.
Batteries with proper model codes like BN46 are more likely to come from reputable sources and include safety features that protect against overcharging, overdischarging, and short circuits.
For these reasons, choosing the correct model, such as BN46, is essential for maintaining your phone’s safety, performance, and longevity.
Read Also: Realme 7 Battery Model Name: BLP807 Genuine Info
Genuine Battery vs Low Quality Replacement
The battery market contains many third party or low quality replacements, so it’s important to be cautious when buying or replacing a BN46 battery.
Always check the label carefully: genuine batteries should clearly display the model number (BN46) along with safety certification marks such as CE, RoHS, or UL.
Avoid batteries with bulging, damaged, or suspicious packaging, as some sellers may label a battery “BN46” but ship a mismatched or poor quality batch always verify the shape and connectors before ordering.
It’s also best to choose new batteries over used or refurbished ones, as new units provide full capacity, better reliability, and lower risk of premature failure.
Finally, prioritize batteries from trusted manufacturers or retailers that carry proper safety certifications, since cheaper no brand alternatives may skip important safety designs, posing a risk to both the device and the user.
How to Safely Replace and Use BN46 Battery
If your phone shows low battery, overheating, swelling, or abnormal drain, replacing the battery may help, but proper handling is essential.
Ensure the battery matches the exact part number (BN46) and your phone model (e.g., Redmi Note 8, Redmi 7).
Use a proper toolkit or a technician to avoid damage, and perform a first charge discharge cycle to help condition the battery.
Avoid extreme temperatures and overcharging to preserve battery health.
Following these steps ensures optimal performance and longevity of your BN46 battery
Common Issues and Troubleshooting for BN46 Batteries
Even with a proper BN46 battery, users may encounter issues.
Fast battery drain after replacement can indicate a low quality battery or the need to recalibrate the phone’s software; resetting battery statistics may help, but persistent problems could mean the battery is faulty.
If the phone doesn’t power on, the battery may have been installed incorrectly or be incompatible despite labeling, so checking the part number and reseating the connection is essential.
Battery bulging or overheating is a serious warning stop use immediately, as it signals a defective cell or poor design.
Inaccurate battery percentage readings occur when the cell configuration or chemistry differs from the original, causing the system to misread voltage versus capacity; in such cases, using a genuine BN46 battery usually resolves the issue.
Why BN46 Remains Common Despite Newer Phones
Despite newer smartphones being released, the BN46 battery remains relevant because many older but still widely used Xiaomi models, such as the Redmi 7 and Redmi Note 8, are still in service, and their owners often replace batteries when performance declines.
In markets where budget considerations are important, replacing just the battery is far cheaper than buying a new phone. The BN46 form factor and specifications offer a practical balance of capacity, size, and cost, making it well suited for these mid range devices.
For these reasons, BN46 continues to be widely marketed and used, even years after the original phones were released.
How to Buy a BN46 Replacement Safely
When buying a BN46 battery, especially online or from local markets, make sure to consider these steps:
Ask the seller to confirm part number (BN46) and the exact phone model you have.
Prefer a battery that states certifications (CE / RoHS / UL) and labels like “Li-ion” or “Li-polymer.” Avoid ambiguous “compatible with many phones” claims without model numbers.
Inspect physical shape against your old battery especially the contacts and case outline.
When possible, buy from a trusted retailer or Xiaomi authorized service centre.
After installation, monitor the battery for the first 24–48 hours: check charging speed, heat, battery life, and whether phone behaves normally.
Final Thoughts
The BN46 battery model name is not just a random label it’s an important identifier. It ensures that a battery is compatible with specific Xiaomi phones, meets certain standards, and is not a mismatched or poorly built part.
Using a genuine BN46 battery ensures stable performance, reliable charging, and lower risk of overheating or swelling, while cheap generic replacements can cause poor performance or safety issues.
Always treat battery replacement as a serious repair verify part numbers, handle components carefully, and follow proper battery care. A correctly installed BN46 can significantly extend your Xiaomi phone’s lifespan.
Frequently Asked Questions (FAQ)
What is the BN46 battery model name?
The BN46 battery model name refers to a specific battery used in certain Xiaomi smartphones. It is a part number that identifies the correct battery size, connector type, and technical specifications needed for compatible phones.
What is the capacity of the BN46 battery?
Most BN46 batteries have a capacity of around 3900 mAh with a nominal voltage of 3.85V. This capacity supports everyday usage and offers reliable backup for supported Xiaomi devices.
How do I know if my battery is a genuine BN46?
A genuine BN46 battery should have: Clear printing of “BN46” on the label, Safety certifications such as CE or RoHS, Clean packaging with no swelling, dents, or damage. If any details look suspicious, avoid using the battery.
Can I use any Xiaomi battery instead of BN46?
No. Even if another battery has a similar capacity, the shape, connector layout, and calibration may differ. Always use a battery with the exact BN46 model name for safety and proper performance.
How long does the BN46 battery last?
Battery life depends on usage, charging habits, and app activity. Under normal use, a BN46 battery can last several years. However, heavy usage or fast charging may reduce its lifespan over time.
What are signs that I need to replace my BN46 battery?
You may need a replacement if you notice: Fast battery drain, Overheating, Swelling or bulging, Phone shutting down unexpectedly, Inaccurate battery percentage readings