Replacing the battery on Xiaomi Redmi 7: a step-by-step guide with photos and tips

Replacing the battery with Xiaomi Redmi 7 is a challenge that every owner of this popular smartphone faces sooner or later. Even with careful use of lithium-ion batteries lose up to 20-30% of capacity after 2-3 years of active use. If your phone starts to run out in a couple of hours, spontaneously turn off at 20-30% charge or overheat during charging, it’s probably time to change the battery.

In this article, we will go into detail about the process, from choosing the right battery to the final assembly of the device, what tools you will need, how to safely disassemble the Redmi 7 without damage, and what hidden nuances can await when replacing the battery in this particular model, and we will also provide recommendations for calibrating and maintaining the new battery to extend its life.

Important: If you've never disassembled a smartphone yourself, make a sober assessment of your strength. Mistakes in replacing the battery can cause plumes to damage, short circuit, or even loss of warranty (if it's still valid), and in some cases it's cheaper and safer to go to a service center.

Signs of battery wear on Redmi 7

Before you start replacing, make sure the battery is the problem, and here are the key symptoms that indicate battery wear:

• 🔋 Phone's running out of power. 3-4 One hour with moderate use (previously kept the day)
• 🔌 Charging jumps (for example, from 50% immediately drops to 15% after rebooting)
• 🔥 The device heats up strongly during charging or under load
• ⚡ The phone turns off when 20-30% The indicator shows the remaining
• 📉 Settings menu → Battery → The state of the battery capacity shows less than 80% of the original
• 💥 Visual deformation of the body (bloating of the battery, which can lift the screen)

If you see at least 2-3 signs on the list, the probability of battery wear is 90%, but before replacing it, you should exclude other reasons: for example, background applications that consume a charge, or a faulty charger. For diagnostics, you can use applications like AccuBattery or CPU-Z, which show the real state of the battery.

Which battery to choose for Redmi 7: original vs analogues

The battery for Xiaomi Redmi 7 is marked BM47 and a nominal capacity of 4000 mAh. When choosing a new battery, you have three main options:

We recommend choosing between the original battery or certified counterparts from proven brands. Cheap no-name batteries often have real capacity 20-30% below the declared and can damage the smartphone's power controller.

• 📦 Packaging: Xiaomi’s original batteries come in branded hologram boxes
• 🔍 Marking: the model must be indicated on the battery (BM47), Capacity (4000 mAh), voltage (3.85V)
• 🛡️ Guarantee: Official sellers must have a check and a warranty card

⚠️ Warning: When buying a battery on marketplaces (such as AliExpress or Wildberries), check the reviews and ratings of the seller. Often under the guise of the original sell fakes with a capacity of 2500-3000 mAh, which will last from strength six months.

Necessary tools for battery replacement

To replace the battery on your own in Redmi 7, you will need a minimum set of tools, most of which can be bought in electronics stores or ordered on the same AliExpress as a smartphone repair kit.

Screen suction cup | Plastic mediator or guitar mediator | Cross screwdriver (PH00 or PH0) | Thin-ended Tweezers | Thermocles or double-sided Scotch tape to fix a new battery | Alcohol wipes to clean contacts-->

More about each instrument:

• 🧲 Suction: it is necessary for gently raising the screen after heating. It is better to take with a metal ring - it is stronger.
• 📏 Plastic mediator: used to separate the body and the screen. Metal tools can scratch the frame.
• 🔧 Screwdriver. PH00: Most of the screws in Redmi 7 have a small cruciform screwdriver!
• 🔥 Hair dryer or thermo-air station: to soften the glue that the battery is glued to. Optimal temperature is 60-80°C.
• 🧴 Isopropyl alcohol (90%+): Helps remove glue residues and clean contacts.

If you don't have a hair dryer, you can use hot air from a lighter, but it's risky - overheating can damage the plumes. Alternatively, put the phone on a warm battery or in the microwave (EXCEPT!) on 10-15 minutes - the heat from the lamp will soften the glue.

⚠️ Warning: Don't use knives, scissors or other sharp metal objects to remove the battery! the risk of battery puncture leads to electrolyte leakage or even fire.

Step-by-step instructions for replacing the battery

Now, to the process itself, follow the instructions carefully so that you don't damage the plumes or the board.

Step 1: Turn off and prepare the phone

Before disassembling completely turn off the phone and remove SIM-This will prevent short circuits, and we recommend working on a soft surface (such as a mouse mat) so that you don't scratch the screen.

Step 2: Removal of the back cover

The Redmi 7 back cover is glued around the perimeter to remove it.

1. Heat the edge of the body with a hairdryer (especially near the on and volume buttons) for 1-2 minutes.
2. Suction lid near the charging connector and pull up.
3. In the resulting gap insert a plastic mediator and carefully conduct them around the perimeter, separating the lid.

Step 3: Shutting off the battery

Once you remove the lid, you'll see the battery glued to the case, and first you'll need to disconnect it from the board to avoid short circuits:

1. Unscrew 5 screws that fix the metal plate above the battery (they are of different lengths - remember the location!).
2. Carefully tuck the plate with tweezers and remove it.
3. Unplug the battery plume with a plastic transmitter.

Now we can start removing the old battery, which is glued to double-sided tape, which becomes very sticky over time.

Step 4: Remove the old battery

This is the most important stage.

1. Pick up the battery from any corner with a plastic mediator.
2. Slowly pull it up while applying the glue around the perimeter. If the resistance is strong, heat the battery with a hairdryer (no more than 60 ° C!).
3. Remove the remains of the glue from the body with an alcohol napkin.

⚠️ Warning: If the battery is swelling, don't pierce it or bend it! Bloated batteries contain gas under pressure and can explode if damaged.

Step 5: Installation of a new battery

Before installing the new battery:

• Make sure that there is no dust or fat on her contacts (wipe with alcohol).
• Make sure the plume is not bent or damaged.
• Stick the battery onto a new double-sided scotch or apply heat-glue around the edges.

After installation:

1. Connect the battery plume to the board.
2. Set the metal plate and twist the screws (observe order!).
3. Set the back cover in place and press it to lock.

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After replacing the battery, be sure to calibrate: completely discharge the phone, then charge to 100% without interruptions. Repeat the procedure 2-3 times for the charge indicator to work accurately.

Frequent Mistakes and How to Avoid Them

Even if you change the battery carefully, you can make mistakes that will cause your phone to fail, and here are the most common ones and ways to prevent them:

• 🔌 Battery plume damage: never pull the wires! Unplug the plume by putting it on the plastic connector, not the metal contacts.
• 🔧 Tangled screws: Redmi 7 uses screws of different lengths. If you twist a long screw into a place for a short one, you can damage the board!
• 🔥 Battery overheating: When heated with a hairdryer, keep it at a distance of 5-10 cm and do not direct the air flow to one point longer than 30 seconds.
• 📱 Dust hitting the screen: after disassembly, wipe the insides of the phone with a dry lilaless wipe.
• 🔋 Incorrect fixation of the new battery: if the battery is not glued tightly, it can move when vibrating, which will lead to a break in the plume.

If the phone is not switched on after replacement:

1. Check if the battery is connected to the board.
2. Make sure the battery is not “upside down” (contacts must match!).
3. Connect your phone to charge for 10-15 minutes – sometimes a new battery needs an initial charge.
4. If nothing helps, check if other plumes (such as the display or power buttons) have disconnected during the disassembly.

Calibration of the new battery and its care

Replacing the battery is only half the battle, and in order for the new battery to last as long as possible, it needs to be calibrated properly and followed the rules of operation.

Calibration of the battery

Calibration helps the power controller to determine the level of charge more accurately, conduct it in the first days after replacement:

1. Completely discharge the phone before automatically shutting down.
2. Connect to the original charger and charge up to 100% without interruptions.
3. Turn off the charger and use the phone until it is completely discharged.
4. Repeat the cycle 2-3 times.

After calibration, the charge indicator will show the real level, without jumps.

Operational rules

Compliance with these recommendations will prolong the life of the new battery:

• 🔌 Avoid deep discharge (below 10%) and recharge (above 90%.
• 🌡️ Do not use your phone in extreme temperatures (below 0)°C or higher than 40°C).
• 🔄 Try to use the original charger or certified analogues with Quick Charge 3.0 support.
• 🛌 Don’t leave your phone on charge all night – it shortens battery life.
• 📵 Disable background apps that actively consume charge (such as navigation or gaming).

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If you play heavy games or shoot videos often, remove the case during heavy use – this will improve heat sink and reduce battery load.

When is the best time to contact the service center

While replacing the battery with a Redmi 7 is a simple procedure, in some cases it is better to trust it with a professional.

• 🔧 You have no experience in disassembling electronics and are afraid of damaging your phone.
• 💥 The battery is swelling - it is dangerous for self-replacement.
• 🔌 After replacement, the phone does not turn on or charge.
• 📱 You damaged the display plume or buttons during disassembly.
• ⚡ The new battery is quickly discharged or overheated - it may be defective.

The cost of replacing the battery in the service center is 1000-2000 ₽ (It's not that expensive, but you get a job guarantee and you don't risk damaging your phone.

If you decide to change the battery yourself, but something went wrong, don't try to fix the consequences yourself, for example, if the phone can't see after the change. SIM-If you have a card or a touchscreen that's not working, you've probably damaged the plume, and if you do that, you can only make the problem worse.

FAQ: Frequent questions about replacing the battery with Redmi 7