Replacement of the battery on Xiaomi Redmi Note 7 Pro: everything you need to know before repair

Battery is one of the most vulnerable places in any smartphone, and Xiaomi Redmi Note 7 Pro is no exception. After 2-3 years of active use, battery capacity can decrease by 30-50%, and battery life can be reduced by many times. If your device suddenly turns off at 20-30% charge, quickly discharges or the case is swollen, it is time to think about replacing. But should you contact the service center or can you manage it yourself?

In this article, we will take a step-by-step guide to replacing your battery with a Redmi Note 7 Pro, go into detail on choosing a quality battery, the tools you need, and the typical errors that can cause damage to your smartphone, and learn how to verify the battery’s authenticity before you buy it, and what to do if the device doesn’t turn on after you replace it.

⚠️ Important: Redmi Note 7 Pro has a glue battery glued to the body, and it requires care to replace it, because if you do something careless, you can damage the plumes or the display. If you've never taken out a smartphone, you should trust the professionals to do it.

Signs that the battery needs to be changed

How do you know if the Redmi Note 7 Pro battery has run out of power?

• 🔋 The smartphone discharges in 3-4 hours with moderate use (previously held the day).
• ⚡ Charging jumps: for example, from 50% immediately drops to 15%, or the phone turns off at 20-30%.
• 📱 The case swelled – between the screen and the back cover there were gaps, or the smartphone “plays” when pressed.
• 🔥 The phone gets very hot during charging or operation (especially in the battery area).
• ⚠️ The system shows a message: "Battery damaged, contact the service".

If you see at least 2-3 of the features on the list, the battery is likely degraded, and you can check its condition through an engineering menu or applications like AccuBattery (available on Google Play), and if the capacity is below 70-75% of the factory capacity (3850 mAh for the Redmi Note 7 Pro), it is recommended to replace.

⚠️ Attention: A bloated battery is dangerous! It can burst or ignite when mechanically exposed. If the case is deformed, don't try to disassemble the smartphone yourself - contact the service.

Which battery to choose for replacement?

The original battery for the Redmi Note 7 Pro is BM47-marked and has a capacity of 4000 mAh (nominal - 3850 mAh). The market is full of fakes, so pay attention to:

• 🏷️ Article: Must be the same as the original (MBJ404740 or BM47).
• 📦 Packaging: Xiaomi's proprietary box with a hologram and QR-code (can be checked on the official website).
• 🔍 Appearance: The battery must bear the date of production, serial number and the inscription "Made in China" (not "Assembled"!).
• 💰 Price: the original costs from 1500 to 2500 rubles. Cheap analogues (500-800 rubles) often have an understated capacity.

Where to buy it?

💡 Tip: Before buying, ask the seller to provide a photo of the battery on both sides. The original has clear labeling and uniform contact color (without rubbing).

Battery replacement tools

For a self-replacement, you will need:

New battery (tested!)

Plastic blades or mediators (2-3 pieces)

Screen suction cup (diameter 5-7 cm)

Screwdriver cross (PH00 or PH0)

Tweezers (thin, with curved ends)

Dryer or thermo-air station (for softening the glue)

Isopropyl alcohol (90%+) and cotton swabs

Double-sided tape or glue B7000 (fixing)-->

⚠️ Warning: Do not use metal blades - they can damage plumes or body.The best option is plastic mediators or special tools for disassembling smartphones (sold in sets on AliExpress).

If you don't have a hair dryer, you can do without it, but the process of removing the battery will be more difficult. The alternative is to put the smartphone on a warm battery (no higher than 50 ° C!) for 10-15 minutes to soften the glue.

Step-by-step instructions for replacing the battery

Before starting work completely turn off the smartphone and remove SIM-A memory card. Work on a clean, well-lit surface.

Step 1: Removing the back cover

1. Heat the back end edge with a hair dryer (especially near the buttons and USB connector) for 1-2 minutes. Temperature - 60-70 ° C (not higher!).

2. Suction the lid next to the USB-C connector and pull it up. If the lid doesn't lend itself, gently tuck it in with a plastic spatula.

3. Walk the shoulder blade around the perimeter, separating the lid from the body. Be careful - under the lid there are plumes of the fingerprint scanner and antenna.

Step 2: Shutting off the battery

1. Unscrew 10 screws that fix the metal plate (they are of different lengths - remember the location!).

2. Take the plate off carefully and disconnect the battery plume with a plastic shoulder blade.

3. Check the voltage at the contacts of the battery multimeter (should be 3.7-4.2V). If the voltage is below 3V, the battery is deeply discharged - it can not be disassembled without a special device (risk of fire).

Step 3: Remove the old battery

1. Put a plastic blade on the battery from any angle and pull it up. If the glue is strong, heat the battery with a hair dryer (no higher than 80°C!).

2.Put a thin plastic card or mediator under the battery to prevent it from sticking back.

3. Carefully separate the battery from the body, pull it over the edge, if the glue is left on the body, remove it with alcohol.

⚠️ Warning: Don't pierce or bend the battery! lithium batteries can ignite if mechanically damaged.

Step 4: Installation of a new battery

1. Check the contacts of the new battery - they should be clean and smooth. If necessary, wipe them with alcohol.

2. Apply a thin layer of B7000 glue or double-sided tape to the case (not the battery!).

3. Set the battery, press it for 10-15 seconds to fix.

4. Connect the battery plume and check if it holds a charge (plug the charger for 1-2 minutes).

Step 5: Build a Smartphone

1. Place the metal plate in place and twist the screws (do not pull!).

2. Connect the tailgates of the back cover (fingerprint scanner, antennas).

3. Stick the back cover. You can use perimeter adhesives like B7000 for reliability.

4. Turn on the smartphone and check the operation of all functions: charging, sensor, camera, speakers.

(1) Correct connection of the battery plume.

(2) Short circuit (test the voltage on the contacts).

(3) Integrity of display and motherboard plumes.-->

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the battery.

• 🔧 Twisted screws → Solution: Use a screwdriver with a torque limiter.
• 🔥 Battery overheating → Solution: Dry dryer for no longer than 2 minutes and no higher than 80°C.
• 📱 Damage to plumes → Solution: use only plastic tools.
• 🔋 Wrong polarity → Solution: Check the markings. + and − battery-board.

If the battery is discharged quickly after replacement, you may have bought a fake or installed it incorrectly.

• The density of the battery to the housing (there should be no gaps).
• Quality of contacts (oxidation or pollution reduces charging efficiency).
• Energy saving settings (sometimes get lost after disassembly).

How to extend the life of a new battery?

To make your new battery last longer, follow these rules:

• 🔌 Avoid deep discharge (do not allow the charge to fall below 10%).

💡 Useful advice: Calibrate your battery once every 2-3 months:

1. Completely discharge the smartphone before turning it off.

2. Charge to 100% without interruption.

3. Turn off charging and use the phone until it is completely discharged.

Repeat the cycle 2-3 times.

This will help the power controller to more accurately determine the level of charge.

Replacement cost in service vs self-repair

If you are not sure about your abilities, compare the costs:

💰 Conclusion: If you have experience disassembling the equipment, self-replacement will cost less. Otherwise, it is better to overpay for the service - repairing a damaged motherboard will cost 5-10 times more expensive.

FAQ: Frequent questions about battery replacement