Replacement of the battery on Xiaomi Redmi Note 7: instructions with a photo, battery selection and nuances of repair

The Xiaomi Redmi Note 7, released in 2019, is still a popular smartphone due to its balanced performance and reliability. However, even the most enduring devices eventually lose battery capacity, the phone runs out in a few hours, and sometimes even shuts down completely at 30-40% charge, if you encounter such problems, replacing the battery is the only solution.

In this article, you will find step-by-step instructions for replacing the battery with a Redmi Note 7 with a photo, recommendations for choosing a quality battery, a list of necessary tools and critical nuances that are ignored by 90% of craftsmen (for example, why you can not use metal mediators to disconnect the plumes), and we will also discuss whether you should contact the service center or you can cope with yourself - taking into account the cost of repairs in 2026.

Signs that it is time to change the battery

It's not always a fast phone drain that means battery wear, and sometimes the problem is software failures or apps' background power consumption, but there are clear signs that the battery is wearing out:

• 🔋 The phone discharges by 50% or more in 2-3 hours in standby mode (without active use).
• 📉 Diagnostic applications (e.g. AccuBattery) show a capacity of less than 70% of the factory capacity (original capacity of Redmi Note 7 – 4000 mAh).
• 🔌 The device suddenly turns off at 20-30% charge, and after connecting the charging shows 0-5%.
• 🔥 The phone body is noticeably heated in the battery area even with minimal load.
• 📱 The phone swelled: the back cover moves away from the screen, and the display glass begins to “play” when pressed.

If you see at least 2-3 of the signs on the list, the battery needs to be replaced soon, and a ballooning battery is especially dangerous: it can damage the display, motherboard or even ignite.

Which battery to choose for Redmi Note 7: original vs analogues

There are three types of batteries available on the market for the Redmi Note 7:

1. Original (OEM) — They are manufactured in factories of Xiaomi or its official partners, they have a factory marking, a capacity of 4000 mAh and a warranty of 6-12 months. Price: 1500-2500 ₽.
2. Quality analogues – produced by proven brands (Baseus, Remax, Patona) Capacity can exceed the original (up to 4200-4500 mAh), but the service life is often shorter. Price: 800-1500 ₽.
3. No-name batteries are cheap Chinese equivalents without certificates, low quality, rapid wear and even fire. Price: 400-800 ₽.

We recommend choosing the original batteries or analogues from Baseus/Remax labeled BM47 (battery code for Redmi Note 7).

• 📦 Packaging: The original has a holographic sticker with a serial number.
• 🔍 Marking: The battery must have a model on it (BM47), capacity and production date.
• 🛡️ Guarantee: Official sellers have at least 6 months.

⚠️ Warning: Batteries over 4,500 mAh for the Redmi Note 7 are a hoax! The maximum factory capacity is 4,000 mAh, and the "enlarged" counterparts are either understated or incompatible with the power controller.

Battery Replacement Tools: What You Need

To replace the battery on Redmi Note 7, you will need:

Screen suction cup|Plastic mediators (2-3 pcs.)|The screwdriver (PH00)|Tweezers with curved ends|Thermoclei or bilateral scotch (to fix a new battery)|Hair dryer or thermoplatform (to soften glue)|Alcohol and napkins (to clean contacts)-->

Where to buy tools:

• 🛒 Smartphone repair kits are sold on AliExpress (price: 300-800) ₽) or radio shops.
• 🔧 If you do not want to buy a full set, it is enough to buy a sucker, mediators and a screwdriver. PH00.

Important: Do not use metal mediators or knives to disconnect the battery! This can damage the plumes or puncture the battery, which will lead to a short circuit.

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Before starting work, completely discharge the phone to 0% and turn it off, which minimizes the risk of fire if the battery is accidentally damaged.

Step-by-step instructions for replacing the battery with the Redmi Note 7

The battery replacement process takes 30 to 60 minutes, and follow the instructions carefully to avoid damaging the plumes or display.

Step 1: Removing the back cover

1. Heat the back cover of the phone around the perimeter (temperature ~60°C) for 2-3 minutes. This will soften the glue.

2. Apply the suction cup to the bottom of the screen (near the USB-C connector) and pull up.

3. Insert a plastic mediator into the formed gap and carefully run it along the body, disconnecting the latches.

⚠️ Warning: Don't use excessive force when removing the lid! Underneath it are the fingerprint scanner plumes and antennas - they are easy to damage.

Step 2: Battery disconnection

1 Unscrew 10 screws that fix the metal plate above the battery (use the PH00 screwdriver).

2. Gently slap the battery plume with a plastic pickup and unplug it from the motherboard. Don't pull the wires!

3. Under the battery are 2 strips of glue. Pick them up with tweezers and slowly pull to separate the battery from the body.

Step 3: Installation of a new battery

1. Clean the contacts of the new battery and the connector on the motherboard with alcohol.

2. glue the new battery to a double-sided tape or apply heat glue around the perimeter.

3. Connect the battery plume to the board and fix the metal plate with screws.

Step 4: Assembly of the phone

1. Make sure all plumes are connected correctly (especially the fingerprint scanner and speaker).

2. Press the back cover and warm it up with a hair dryer to activate the glue.

3. charge the phone 100% and perform 2-3 cycles of full discharge/charging to calibrate the controller.

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After replacing the battery, be sure to check the fingerprint scanner and camera – these modules are most often affected when disassembled.

How much does it cost to replace a battery in a service center (2026)

If you are not sure about your abilities, you can contact the service: Prices for a replacement battery Redmi Note 7 in 2026:

• 🏠 Official Xiaomi service: 2500-3500 ₽ (battery-powered).
• 🔧 Informal services: 1200–2000 ₽ (analogous).
• 📱 Mobile masters (home visits): 1800–2500 ₽.

Cost of operation without battery: 500-1000 ₽. However, most services offer a comprehensive battery service. + replacement".

The advantages of using the service:

• ✅ Work guarantee (usually 3-6 months).
• ✅ Fastness (1-2 hours).
• ✅ Diagnostics of other components (for example, checking plumes).

Cons:

• ❌ Risk of installing a non-original battery (check in advance).
• ❌ The price may be increased by additional work".

Frequent Battery Replacement Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes that cause their phones to break down, and here are the most common mistakes and ways to prevent them:

1. The fingerprint scanner plume is damaged when the back cover is not removed neatly, so you can use thin plastic mediators and not force the top of the phone.
2. Overheating of the battery during soldering - if you decide to solder the contacts, the soldering iron temperature should not exceed 300 ° C. Solution: use a thermal air station or entrust the soldering to professionals.
3. Incorrect calibration: After replacing the phone, it may show an incorrect charge level. Solution: Perform 2-3 full discharge/charging cycles.
4. Using metal tools, that leads to short circuits. Solution: only work with plastic or wooden mediators.

If the phone does not turn on after replacing the battery, check:

• 🔌 Connecting the battery plume to the motherboard.
• 🔋 Polarity of contacts (plus / minus should coincide).
• 📱 Integrity of the fuse on the board (can burn with a short circuit).

FAQ: Answers to Frequent Questions