Battery for Xiaomi Redmi Note 8 Pro: how to choose and replace the right

The Xiaomi Redmi Note 8 Pro, released in 2019, is still popular thanks to the powerful MediaTek Helio G90T processor, quadruple camera and capacious battery. However, over time, even the most reliable battery loses capacity: the phone starts to run out in a few hours, turn off at 20-30% charge or overheat during charging. If you encounter these problems, it’s time to think about replacing the battery.

In this article, we will learn which battery is right for the Redmi Note 8 Pro, whether it is original or analog, how to tell the difference between a fake, where to buy a quality battery and how to replace it yourself. Also, you will learn about the nuances of calibrating a new battery and how to extend its life. If you are not sure about yourself, at the end of this article there are tips on choosing a service center.

Technical characteristics of the original battery

Smartphone Xiaomi Redmi Note 8 Pro is equipped with a lithium-polymer battery model BM47 (article MB-J18) with the following parameters:

• 🔋 Capacity: 4500 mAh (typical), 4400 mAh (minimum).
• ⚡ Voltage: 3.85 V (nominal), 4.4 V (maximum).
• 📏 Sizes: 155.0 × 73.0 × 3.5 mm (length) × width × thickness).
• 🔌 Type of connector: 3-pin (temperature-controlled).
• 🔄 Support for fast charging: 18 watts (Quick Charge 3.0).

The original battery is equipped with a protective circuit (PCB) that prevents overheating, overcharging and short circuiting.

• 🏷️ QR-Serial number code (for authentication purposes).
• 📅 Date of production (format) YYYY-MM-DD).
• ⚠️ Warning inscriptions in Chinese and English.

Important: The batteries for the Redmi Note 8 Pro and the Redmi Note 8 (BM46) are incompatible! They have different sizes, connectors and capacity. Installing the battery from the Note 8 in the Note 8 Pro will lead to charging errors and possible damage to the power controller.

Original vs Analogue: What to Choose?

When buying a new battery for the Redmi Note 8 Pro, you will face a choice: buy the original Xiaomi battery or a quality analogue from third-party manufacturers.

If you want maximum life and no problem with charging, choose the original, but it is difficult to find in retail stores - most often sold fakes under the guise of "original". To avoid getting into a fake, buy a battery:

• 🛒 In official Xiaomi stores (for example, mi.com or branded salons).
• 🔍 Verified sellers on AliExpress (with a rating above 98% and reviews with photos).
• 🔧 In service centers that provide a replacement guarantee.

Among the analogues, brands have proven themselves well:

• 🔋 ZMI (Xiaomi subsidiary, close to the original quality).
• 🔋 Baseus (Reliable batteries with overheating protection).
• 🔋 Remax (budget option, but with good reviews).

⚠️ Attention: Cheap batteries without a brand (price below 500) ₽) They often have understated capacity and can swell in 3-6 months. Check reviews and ask the seller for quality certificates!

How to verify the authenticity of the battery?

Fake batteries for the Redmi Note 8 Pro look almost identical to the original, but can cause serious harm to the smartphone, from rapid loss of capacity to fire. Here are 5 ways to distinguish the original from fake:

1. Verification QR-The original battery was marked QR-A code that can be scanned through the Mi Authenticity Check app (available on Google Play), and if the code doesn't recognize or gives an error, you're looking at a fake.
2. Weight and density: The original battery weighs ~70 grams and has a uniform density; counterfeits are often lighter (50-60 g) or have "emptiness" when pressed.
3. Print quality: The original text is clear, blurry, and fakes are often crooked or misprinted (e.g., "XIAOMI" instead of "Xiaomi").
4. The original battery has thicker contacts (plus, minus, thermistor) and gold coated contacts, often thin and dull in counterfeits.
5. Multimeter test. Measure the voltage at the terminals: the new original battery should be in the range of 3.7-3.9 V. If it shows 4.0 V and above, it is a fake with an overvoltage.

Step-by-step instructions for replacing the battery

If you decide to replace the battery yourself, follow this instruction: Difficulty: medium (needs accuracy and basic skills in working with the equipment).

Tools required:

• 🔧 Set of screwdrivers (cross-haul) PH00, flat).
• 🔪 Plastic mediator or shoulder blade for disassembly of the body.
• 🧲 Screen removal suction cup (optional).
• 🔥 Fryer (for softening glue).
• 🩹 Double-sided tape or glue B7000 fixing.

Turn off the phone and remove it. SIM-map|Charge the battery to 30-50% (for safety)|Prepare the workplace (clean surface, good lighting)|Make a backup of the data (in case of errors)|Wear an antistatic bracelet (optional)-->

Step 1 Remove the back cover

Heat the back edge with a hair dryer (~60°C) for 2-3 minutes to soften the glue. Gently apply the lid to the plastic mediator starting at the bottom corner. Don't put too much effort into damaging the plumes!

Step 2. Shutting down the battery

When you remove the lid, you'll see the battery glued to the body, and the first thing you do is unplug the battery connector (which is next to the motherboard), and use a plastic blade to keep the contacts in check.

Step 3: Remove the old battery

The battery is glued to the body. You can pull it from the edge and slowly pull it up with the glue. If the battery is swelling, don't prick it, it's dangerous. You can call the service.

Step 4: Installation of a new battery

Make sure the new battery is the same size and connector, stick it on a double-sided tape or apply a thin layer of B7000 glue, plug the connector in and check if the phone recognizes the battery (the charge notification should appear).

Step 5: Build the phone

Make sure all the plumes are connected, and gently press the back cover. If the glue has lost its properties, use a new one. Turn on the phone and check the battery.

⚠️ Note: If the phone does not turn on after replacement or the battery does not charge, check: - Correct connector connection (don't confuse polarity!). - Integrity of charging plume (often damaged during disassembly). - Presence of errors in the system (it may be necessary to reset settings).

Calibration of the new battery

Once the battery is replaced, it needs to be calibrated to ensure that the phone correctly displays its charge level, which is especially important for analog batteries, which can show incorrect data.

Calibration instructions:

1. Charge your phone to 100% and hold on charging for another 1-2 hours.
2. Turn off charging and use your phone until it automatically turns off (do not turn it on until it is completely discharged!).
3. Connect the charging and charge to 100% without interrupting the process.
4. Repeat the discharge / charge cycle 2-3 times.

To speed up the process, you can use the engineering menu:

1. Enter the phone code in the app: ##4636##
2. Select Battery Information and check the Charge Level option (should match the one displayed on the screen).
3. If the data does not match, reset the calibration via the AccuBattery app (available on Google Play).

💡

After replacing the battery, avoid using the phone at extreme temperatures (below 0°C or above 40°C) during the first week, which will help the battery to get used to the new cycle.

How to extend the battery life?

Even a new battery will last longer if you follow simple rules of operation, here are 7 tips to help keep the battery in capacity:

• 🔌 Avoid full discharge. The optimal charge range is 20-80%. Regular discharge to 0% reduces the life of the battery.
• ⚡ Use the original RAM. Charges with AliExpress for 200 ₽ damage to the power controller.
• 🌡️ Don't overheat your phone. Don't play heavy games while charging, and don't leave your smartphone in direct sunlight.
• 🔄 Turn off overnight fast charging. 18W constant charging speeds up battery degradation.
• 📵 Turn off unnecessary functions. GPS, Bluetooth and 4G in the background, the battery is heavily planted.
• 🔋 Store your phone with 50% charge. If you don't use your smartphone for a long time, charge it up to 50 times a month%.
• 🛠️ Update the firmware. In new versions. MIUI Optimized energy consumption.

💡

The most common reason for rapid battery degradation is the use of cheap chargers and cables. Xiaomi’s original RAM is the most expensive. ~1000 ₽, It extends the life of the battery by 20-30%.

Where to replace the battery if you don’t want to do it yourself?

If you are unsure of your skills or are afraid of damaging your phone, you should contact a service center. Here are 3 proven options:

• 🏢 Official Xiaomi service. ✅ Pros: original parts, 6-12 months warranty. ❌ Cons: High price (2500-3500) ₽), long wait (3-7 days).
• 🔧 Local service centres. ✅ Pros: price 1000-2000 ₽, rapid repair (1–2 hours). ❌ Cons: the risk of installing a non-original battery.
• 📦 Substitution by mail (for example, via Service Mail). ✅ Pros: You don’t have to go to the workshop. ❌ Cons: risk of damage during transportation.

Before the service visit:

• Find out what battery you will install (ask for a photo of the package).
• Ask about the warranty (minimum 3 months per battery).
• Make a backup of the data (sometimes you need to reset your settings).

Frequent errors when replacing the battery

Even experienced users sometimes make mistakes that cause their phones to crash, and here are the 5 most common mistakes and how to avoid them:

1. Screen plume damage. When you remove the back cover, it's easy to touch the plume that goes to the display. Solution: use a plastic mediator and don't push the cover too deep.
2. The battery connector is not connected correctly, so if you confuse polarity or you don't squeeze the contacts, the phone won't charge. Solution: check the photo of the original connection.
3. Using superglue instead of special glue. Superglue can damage plastic parts and make the next sorting impossible.Solution: use B7000 glue or double-sided tape.
4. Calibration neglect: Without calibration, the phone may be showing the wrong percentage of charge. Solution: run 2-3 full discharge/charging cycles.
5. Install a bloated battery, if an old battery is swelling, it can't be pierced or bent, it can cause fire. Solution: carefully remove it without deforming it.

⚠️ Warning: If after replacing the battery, the phone starts to overheat or discharge quickly, immediately disconnect it from charging and remove the battery!

FAQ: Answers to Frequent Questions