How to replace the battery on Xiaomi Redmi 7: a complete guide with photos and nuances

Xiaomi Redmi 7 — One of the most popular budget smartphones of the brand, released in 2019 Despite the reliable assembly, 3-4 In the year of active use, its battery inevitably loses capacity: the phone discharges in a few hours, turns off when it is used. 20-30% If you're facing these problems, replacing the battery is the only solution.

In this article, you will find detailed instructions on how to replace the battery with a Redmi 7, taking into account all the nuances from the choice of the original battery to the calibration of the new battery. We will analyze what tools you need, how to safely disassemble the smartphone without damaging the plumes, and what to do if the phone does not turn on after replacing, and you will also learn whether to contact the service center or you can cope with yourself - even without experience in repairing equipment.

Important: the procedure requires care, but it is not overly complicated, the main thing is to follow the instructions and take your time. If you have never disassembled a smartphone, practice on an unnecessary device or watch a video disassembly before you start work.

Signs that the Redmi 7 battery needs to be changed

It's not always a fast discharge of the phone that's related to battery wear. Sometimes the problem is software failures, application background activity, or damage to the charging port. Before you buy a new battery, check for these key symptoms:

• 🔋 Phone's running out of power. 2-3 hours with moderate use (social networks, messengers, calls).
• 📉 The percentage of charge "jumps": for example, with 40% drops 15% or the phone is turned off when 20-30%.
• 🔌 Charging is extremely slow or interrupted (the cable and adapter are serviceable).
• 🔥 The phone body is noticeably heated in the battery area even without loading.
• 🚫 The device does not turn on or hung on the Xiaomi logo after full discharge.

If at least 2-3 You know the item on the list, and you probably know it's worn out, and you can check it with apps like AccuBattery, or with an engineering menu:

1. Open the Phone app.
2. Dial the code ##4636##.
3. Go to the Battery Information section and compare the current capacity to the factory capacity (4000 mAh for Redmi 7).

If the real capacity fell below 60-70% from the factory (e.g, 2500 m.h. 4000), It's time to change the battery, and also pay attention to the bloating of the battery -- if the back of the phone starts to bulge or spread out at the seams, it's dangerous to use such a device!

⚠️ Warning: A bloated battery can damage the screen or motherboard. If you notice a deformity in the case, don't try to charge the phone - turn it off immediately and start replacing it.

What battery to choose for Redmi 7: original vs analogues

The battery quality is not only the life of the phone, but also the safety of the phone, and cheap, uncertified batteries can swell, overheat, or even ignite.

For Redmi 7 suitable battery with the following characteristics:

• 📏 Model: BM47 (original article) or compatible analogues.
• 🔋 Capacity: 4,000 mAh (do not take batteries with a declared capacity of 5000 mAh)+ mAh is a hoax!).
• ⚡ Voltage: 3.85 V (standard for lithium-polymer batteries).
• 🔌 Connector: Must match the original (3 contacts: +, –, thermistor).

Where to buy:

• 🛒 Official stores: Xiaomi Store, Mi Shop (guarantee of originality).

⚠️ Warning: When buying on AliExpress, check the photos of the real product in reviews - scammers can send cheap fakes instead of the original batteries. Pay attention to the weight (the original battery weighs). ~40-45 d) and packaging (must be a factory film with a hologram).

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Before buying, ask the seller to send a photo of the battery from both sides – so you will make sure that the connector and contacts match the original.

Preparing for replacement: security tools and measures

To replace the battery with Redmi 7, you will need:

New battery (check compatibility)|Plastic blade or mediator (for putting the cover on)|Cross screwdriver (PH00 or PH0)|Tweezers (for working with plumes)|Hair dryer or thermo-air station (for softening glue)|Isopropyl alcohol (for cleaning contacts)|Scotch or double-sided tape (to fix a new battery)|Gloves (protection against static electricity)-->

Also prepare the workplace:

• 🪑 Work at a table with good lighting (better to use a desk lamp).
• ⚡ Use an antistatic bracelet or periodically touch grounded metal objects to remove static electricity.
• 📱 Turn off the phone completely and remove it. SIM-card with a memory card (if installed).
• 🔌 Turn off the phone from charging for 1-2 One hour before disassembly (the battery should cool down).

Important: if the battery is swelling, work in a ventilated room and do not use metal tools to extract it - risk short circuit!

Before disassembling, make a backup copy of the data:

1. Go to Settings → About Phone → Backup.
2. Select Backup in Mi Cloud or copy files to your computer.

Step-by-step: how to disassemble the Redmi 7 and replace the battery

The Redmi 7's disassembly requires care, as the body is glued together and the plumes are brittle.

Step 1: Removing the back cover

The Redmi 7's back panel is glued around the perimeter to remove it.

1. Heat the edge of the body with a hair dryer (temperature) ~60°C) during 2-3 It'll soften the glue.
2. Insert the plastic blade into the gap between the lid and the frame (start at the lower corner where the charging connector is located).
3. Carefully drive the shoulder blade around the perimeter, separating the lid. Don't force it, if the glue doesn't lend itself, warm it up again.

Nuance: There are latches under the lid -- if you pull too hard, they can break. If the lid doesn't respond, check if all latches are snapped.

Step 2: Disconnect the battery plume

When you take the lid off, you'll see the battery covered with black film, and the first thing you do is, you'll disconnect the battery from the motherboard.

1. Unscrew 4 screws that fix the metal plate above the plume (use the PH00 screwdriver).
2. Carefully tuck the battery plume with a plastic spatula and disconnect it from the connector.

⚠️ Warning: If you don't turn off the battery before you disassemble it, you risk closing contacts on the board, which will cause the phone to fail.

Step 3: Remove the old battery

The battery in Redmi 7 is glued to the body to remove it.

1. Put a plastic blade on the battery from any angle and pull it up. If it doesn't lend itself, heat it with a hair dryer (do not overheat - maximum temperature is 70).°C!).
2. If the battery is swollen, do not pierce it - carefully cut the glue with a knife (do not damage the body!).
3. After extraction, clean the seat from the glue residues with isopropyl alcohol.

Critical: if the battery is deformed, do not bend it and do not throw it into the trash - lithium polymer batteries require special disposal!

Step 4: Installation of a new battery

Before installing the new battery:

• 🔍 Check if the connector and polarity match (plus and minus should be in their places).
• 🧴 Apply a thin layer of double-sided tape or special battery glue on the case (sold in electronics stores).
• 🔌 Connect the battery plume to the motherboard and lock the metal plate with screws.

Make sure the battery is flat, without skewing, and if it's walking, tape it around the edges.

Step 5: Assembly of the phone

Collect the phone in reverse order:

1. Put your sleeves in your seats (don’t confuse them!).
2. Stick the back cover. Warm it up with a hair dryer to be reliable. ~50°C) and press on 1-2 minute.
3. Turn the screws (do not pull!).

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After assembly, do not turn on the phone immediately - let the glue under the lid dry. 10-15 minute.

Calibration of the new battery: why it is important

Once the battery is replaced, it needs to be calibrated so that the charge controller can correctly determine the level of charge, and without calibration, the phone can show an incorrect percentage or quickly discharge.

How to calibrate:

1. Completely discharge the phone before turning off.
2. Charge it to 100% without interrupting the process (use the original adapter).
3. Turn off the charger and turn on the phone. If it's less than 100%, re-connect the charge to full charge.
4. Repeat the discharge-charging cycle 2-3 times.

It is also recommended to reset the battery settings:

1. Go to Settings → Applications → All applications.
2. Find Google Play Services and clear the cache.
3. B Settings → Battery Select Reset Battery Settings.

After calibration, the new battery will last longer, and the phone will more accurately display the level of charge.

What to do if the phone does not turn on after replacement

If the Redmi 7 doesn't respond to the power button after you've changed your battery, don't panic.

If the phone is not turned on even after checking the plumes:

1. Connect it to the charger on 30-60 minutes (sometimes the controller needs time to initialize the new battery).
2. Try to press the power button on 10-15 seconds (resetting power).
3. If it doesn’t work, connect your phone to your PC – if it’s defined as Qualcomm. HS-USB QDLoader 9008, will require a flashing.

In difficult cases (damage to the board, burned power controller) it is better to contact the service center.

Should I change the battery myself or contact the service?

Battery replacement in Redmi 7 — If you have experience in disassembling equipment, you can do it. 30-60 But there are nuances that are worth considering:

• ✅ The advantages of self-replacement:
• 💰 Savings (the service will cost 800-1 500 work) ₽).
• 🕒 No need to wait (repair may take place in the service) 1-3 day-day).
• 🔧 Complete control of the process (you choose a quality battery).
• ❌ Cons:
• ⚠️ Risk of damaging plumes or fees (especially if no experience exists).
• 🔋 The warranty for a new battery is valid only when buying in official stores.
• 🛠️ Need tools (if they are not, the purchase will cost 500-1000 dollars) ₽).

It is worth contacting the service if:

• 🔧 You don't have any experience with disassembling smartphones.
• 📱 Phone warranty (self-repair cancels it).
• ⚡ Battery swollen and deformed the body (risk of damage to the board).

Average replacement cost in the service (2026):

• With its own battery: 800–1,200 ₽.
• With battery service: 2,000–2,800 ₽ (depends on the quality of the ABC).

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If you decide to change the battery yourself, take a picture of each step of disassembly – this will help to properly assemble the phone back.

FAQ: Answers to Frequent Questions