Battery BN43 Xiaomi: What phone model is it for and how to choose it

If you are looking for battery information with labeling BN43 For Xiaomi smartphones, you’re likely faced with one of two situations: either your phone’s battery is out of order or you want to buy a spare for the future. BN43 — This is an internal designation that Xiaomi uses to identify battery models, but without additional data, it can be difficult to understand compatibility. In this article, we will not only determine which devices this battery is suitable for, but also tell you how to distinguish the original from a fake, where it is safe to buy a replacement and how to install the battery yourself without the risk of damaging the phone.

It’s important to understand that Xiaomi produces dozens of smartphone models every year, and many of them use batteries with similar labels (e.g., the company’s own phone, BN40, BN41, BN42). An error in selection can lead to the fact that the battery will either not stand in the case, or will not work correctly with the power system of the device. We analyzed official data, service manuals and user reviews to make the most accurate list of compatible models and give practical recommendations.

What does marking mean? BN43 Xiaomi battery?

Code. BN43 — This is not a random set of characters, but part of the notation system that Xiaomi uses to identify components:

• 🔋 B indicates belonging to the Battery category (battery).
• 📱 N stands for New (new version) or Normal (standard capacity). In some sources, it is interpreted as Ni-MH (nickel-metal hydride), but this is not relevant for modern lithium-polymer batteries.
• 🔢 43 is a unique model identifier that is tied to specific smartphone series, and this number can be duplicated in different lines (for example, for Redmi and other devices). POCO), but with different technical characteristics.

Important: marking BN43 can occur on batteries with different capacities (for example, 4000 mAh or 5000 mAh) and voltage (usually 3.85V or 4.4V). It depends on the model of the phone the battery is designed for. BN43 Not enough to accurately determine compatibility – you need to check additional parameters on the battery sticker.

For example, the original battery also indicates:

• 📏 Dimensions (length) × width × mm thickness).
• ⚡ Tension (usually) 3.85V or 4.4V).
• 🔋 Capacity (in mAh, for example, 4500mAh).
• 📅 Date of production (month/year in format) YYMM).

List of Xiaomi models compatible with the battery BN43

Based on data from service centers, smartphone disassemblies and user reports, we have compiled a table of models that use a battery labeled with a battery. BN43. Note that in some cases, the battery may be suitable for several devices of the same line, but with different modifications (for example, for the global and Chinese versions).

⚠️ Note: If your model is not listed in the table, it does not mean that the battery is BN43 Some devices (like the Redmi Note) 9S or POCO M2 Pros can use batteries with similar labels but different technical parameters. Always check the data on the old battery or in the official documentation!

To determine exactly the compatibility, follow the following steps:

1. Remove the battery from your phone (contact the service center if necessary).
2. Take a picture of the sticker on the back of the battery.
3. Compare all parameters (capacity, voltage, dimensions) with those specified on the new battery.

How to distinguish the original battery BN43 fake?

Xiaomi’s smartphone parts market is flooded with fakes, and batteries are no exception, and a fake battery can not only fail quickly, but also cause the device to overheat, bloat, or even catch fire.

• 🏷️ Sticker: The original battery has a flat label, no bubbles or skews, clear text, no blurs, fakes often have a crooked font or typos (e.g., fakes, "XIAOMI" instead of Xiaomi").
• 🔍 QR-Code: The label must contain QR-code that leads to Xiaomi's official website or product information page, and counterfeits often lead to non-existent pages or one-page sites.
• 📦 Packaging: The original batteries come in a tight cardboard box with the Xiaomi logo, hologram and protective stickers. If the battery came in a plastic bag, it's 100% fake.
• ⚖️ Weight: Original battery BN43 It weighs about 80 to 100 grams (depending on capacity), and counterfeiting is often easier because of the use of cheap materials.

🔎 Proven method: Order the battery only from official Xiaomi distributors or certified service centers. Avoid shopping on marketplaces such as AliExpress or eBay, unless the seller provides warranty and quality certificates. BN43 It is usually 1500-2500 rubles (2026), and if you are offered to buy it for less than 1000 rubles, this is a reason to doubt the authenticity of the product.

Where to buy the original battery BN43 Xiaomi?

When buying a battery BN43 It's important to choose a reliable seller to avoid counterfeiting:

• 🏬 Xiaomi's official service center: The most reliable way, but the price can be higher than the market.
• 🌍 Xiaomi official website (mi.com): In the "Accessories" section, original batteries sometimes appear, but the range is limited.
• 🛒 Certified stores: In Russia, it is Svyaznoy, M. Video, Eldorado (in the spare parts department.
• 📦 Checked online sites: On Wildberries or Ozon, look for sellers with ratings above 4.8 and reviews of original batteries.

⚠️ Warning: Avoid buying on Avito, Yule or other private ad sites if the seller cannot provide a check or guarantee. Often under the guise of "original" batteries sell used or refurbished batteries that will last for several months.

Before buying, check with the seller the following points:

• Is there a battery warranty (at least 6 months)?
• Can I return the goods if it does not fit?
• Does the date of production on the sticker match the current year (old batteries lose capacity even in the packaging).

💡

If you buy a battery on AliExpress, choose sellers with a rating of at least 98% and the number of orders more than 1000. be sure to check the reviews with the photo - fakes often give themselves out for poor-quality packaging or absence. QR-code.

Step-by-step instructions for replacing the battery BN43 Xiaomi

If you decide to replace the battery yourself, follow this instruction. ⚠️ Warning: Incorrect replacement can cause plumes to damage, battery rupture or loss of warranty.If you are unsure of your skills, it is best to contact a service center.

You will need to work:

• 🔧 Set of screwdrivers (cross-haul) PH00 flat).
• 🧲 Screen suction cup (or mediator).
• 🔥 Hair dryer or thermo-air station (for softening glue).
• 📱 New battery BN43 (compatible).
• 🧴 Alcohol or isopropyl alcohol for cleaning contacts.

Step 1 Turn off the phone and remove it. SIM-map.

Before disassembling, drain the battery completely (up to 0%) or remove it if possible without opening the case, which minimizes the risk of short circuit.

Step 2. Heat the back cover with a hair dryer.

The glue that glues the lid becomes elastic at a temperature of 60–80°C. Warm up the edges of the phone for 2-3 minutes, then gently tuck the cover with a mediator or suction cup.

Step 3. Unscrew the screws and unplug the plumes.

Inside, you'll see a few screws (usually 10 to 12 pieces), unscrew them and gently disconnect the battery and screen plumes, and use a plastic blade to keep the contacts intact.

Step 4. Remove the old battery.

The battery is glued to the body. Pull it off the edge and slowly pull it up. If the battery is swelling, don't puncture it, it could cause fire!

Step 5. Install a new battery.

Place it. BN43 If you're going to move to the old one, plug the plume in and secure it with screws, make sure the contacts are not bent and the battery is flat.

Step 6: Put the phone back together.

Secure the back cover (use a new glue if necessary) and turn on the device. If the phone doesn't turn on, check the plumes are connected.

Frequent problems after battery replacement and their solution

Even if you have installed the new battery correctly. BN43, There may be problems. Here are the most common ones and how to fix them:

⚠️ Note: If after the battery change, the phone starts spontaneously restarting or turning off, this may indicate that the power controller is incompatible with the new battery.In this case, do not try to solve the problem yourself - contact the specialists, as this can be dangerous!

💡

If the battery is not working properly after the battery is replaced, check the compatibility of voltage (V) and capacity (mAh) first.

How to extend the life of a new battery BN43?

The average life of a lithium polymer battery is 2-3 years or 500-800 charge cycles, but if used properly, this period can be extended.

• 🔌 Use the original charger: Charges from other brands (especially cheap ones) can deliver unstable voltage, which accelerates battery wear.
• 📉 Avoid full discharge: Optimal charge range is 20-80%. Regular discharge to 0% reduces battery life.
• 🌡️ Watch the temperature: Do not leave your phone in the sun or near heat sources. Optimal operating temperature is 10-35°C.
• 📵 Do not use your phone while charging: Playing games or watching videos heats up the battery, which accelerates its degradation.
• ⚡ Turn off fast charging: If you don't rush, charge your phone as normal - this reduces battery load.

💡 Useful tip: Calibrate the battery once every 3 months: completely discharge the phone, then charge to 100% without interruption.This helps to reset the power controller errors and accurately display the charge level.

If you notice that the battery began to discharge quickly or the phone began to overheat, check its condition in the Settings menu. → Battery → Battery status (available on MIUI If the capacity has fallen below 80% of the nominal capacity, it is time to consider replacing it.

FAQ: Frequent questions about the battery BN43