Replacement of the battery on Xiaomi Redmi 7: step-by-step guide with photos and videos

Why does the Redmi 7 battery fail faster than you expect?

Xiaomi Redmi 7, released in 2019, is still a popular budget device due to its balanced performance and reliability. However, even the best batteries lose capacity over time – especially if you actively use the phone, charge it quickly or leave it connected to overnight charging. On average, lithium-ion batteries lose up to 20% of capacity after 300-500 charging cycles, and after 2-3 years of operation, their wear can reach 40-60%.

If your Redmi 7 starts to run out in a couple of hours, spontaneously shuts down at 20 to 30 percent charge, or overheats while charging, these are sure signs that the battery needs to be replaced. Fortunately, you can change it yourself, saving you money on service centers. In this article, we will discuss the step-by-step process of replacing, selecting the right battery, explaining the tools and warning you against typical errors that can lead to damage to the phone.

Before you start disassembling, make sure that the battery is the problem. Sometimes, similar symptoms cause a firmware failure (for example, after the MIUI update) or a malfunction of the power controller. To rule out software problems, check the battery status through the engineering menu:

1. Open the Phone app and enter the combination ##4636##.
2. Go to the Battery Information tab.
3. Compare the current capacity with the passport capacity (4000 mAh for Redmi 7). If the difference is more than 30%, it is time to change the battery.

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

The original battery for Redmi 7 is marked BM47 and nominal capacity of 4000 mAh. However, on the market there are both branded spare parts from Xiaomi and analogues from third-party manufacturers.

Where to buy it?

• 🛒 Official stores: Mi Store, Xiaomi Shop (guarantee of originality, but the price is higher).
• 🌍 Review sites: AliExpress (look for sellers with a rating of 98%+ Photos of real batteries, Beru, Ozon.
• 🔧 Service centers: often sell parts in bulk at reduced prices.

⚠️ Warning: AliExpress batteries can go without thermal film or connector — you have to drink them or glue them yourself. If you're not sure about your skills, you'd better pay too much for the finished version.

Critical: even the original battery can be a repac (restored) and check it before installing the multimeter - the voltage on the contacts should be in the range of 3.7-3.9 V at 50-70% charge.

Preparing for replacement: security tools and measures

Replacing the battery with a Redmi 7 requires care and a minimal set of tools.

• 🔧 Plastic mediators or shoulder blades (2-3 pieces) - to separate the body.
• 🔨 Cross screwdriver (size) PH00 or PH0) — screw.
• 🧲 Magnetic mat or container – to avoid losing small details.
• 🔥 Hair dryer or thermo-air station - for softening the glue (optional).
• 🩹 Alcohol wipes and double-sided scotch – for cleaning and fixing the new battery.
• 📱 Replacement battery (naturally).

Also prepare the workplace:

• 🪑 Work at a table with good lighting.
• ⚡ Turn off the phone and remove it. SIM-memory-card.
• 🔋 Charge your new battery to 30-50% before installation (it’s safer).

⚠️ Warning: Do not use metal tools to tamper with the body - they can damage the plumes or leave scratches on the frame. If the glue is too strong, warm the back cover with a hair dryer (temperature not higher than 60).°C), don't try to tear it off by force.

Turned off the phone and pulled it out. SIM-map|

I have all the tools and a new battery.|

Photographed the location of the plumes (in case of error) |

Put on an antistatic bracelet or touched a grounded object|

Check the voltage of the new battery multimeter-->

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

Now, to the process itself, follow the instructions carefully, because any error can damage the plumes or the display.

Step 1: Removing the back cover

1. Heat the hair dryer around the perimeter for 1-2 minutes (keep the hair dryer at a distance of 5-10 cm).

2. insert a plastic mediator into the gap between the case and the frame (start with the lower right corner where the SIM card is located).

3 Carefully drive the mediator along the body, separating the lid, and if you feel resistance, warm up the place again.

Step 2: Disconnect the plumes and remove the old battery

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

2. Carefully tuck in and remove the plate, and underneath it you'll see the battery plumes, the display and other components.

3. disconnect the battery connector with a plastic blade (don't pull the wires!).

4. Put the battery on a mediator or a special suction cup, if it's glued, heat it with a hair dryer and slowly pull it up.

Important: Don't puncture the battery or rot it, it can cause fire! If it swells, work with safety glasses and gloves.

Step 3: Installation of a new battery

1. Clean the place under the battery from glue residues with an alcohol napkin.

2. glue a new double-sided tape (comes complete with battery) or apply a thin layer of B-7000 glue.

3. Connect the new battery connector to the motherboard. Make sure it sits tight.

4. Put the battery in place and press it for 10-15 seconds to fix.

Step 4: Assembly of the phone

1. Connect all the plumes in reverse order (first the display, then the rest).

2. Install a metal plate and twist the screws (do not tug!).

3. Press the back cover and warm it up with a hair dryer for better fixation of the glue.

💡

After assembly, don’t turn the phone on immediately — wait 10-15 minutes for the glue to grab. Then charge the device to 100% and complete 2-3 full discharge/charging cycles to calibrate the new battery.

Common Mistakes and How to Avoid Them

Even experienced tycoons sometimes make mistakes when replacing a battery, and here are the most common ones and ways to prevent them:

• 🔌 Display plume damage: occurs when you pull the lid too hard or unplug the battery carelessly. Solution: use only plastic tools and fix the plumes before disassembling.
• 🔥 Battery overheating: If you heat the dryer for longer than 2 minutes or keep it too close.Solution: Control the temperature (maximum 80)°C) and take breaks.
• 🔋 Incorrect connector connection: if the battery does not charge after replacement, check if the connector sits tight.
• 📱 Bloating a new battery: if it starts to swell after a few months, it's a sign of marriage or using an unoriginal charger.Solution: Buy batteries only from trusted sellers.

⚠️ Warning: If the phone does not turn on after replacing, check: - Correct connection of all the plumes (especially the display and power buttons). - The presence of voltage on the battery contacts (should be ~3.8 B. - Integrity of the fuse on the motherboard (can burn when shorted). If the problem remains, contact the service center.

How to prolong the life of a new battery: 7 practical tips

To make the new battery last longer, follow these guidelines:

1. Avoid full discharge. The optimal charge range is 20-80%. Regular discharge to 0% reduces the life of the battery.
2. Chargers with voltages higher than 5 V/2 A can damage the power controller.
3. Do not charge your phone in the heat or cold. The optimal temperature is 10–30 ° C. In the cold, the battery discharges faster, and when overheated, it degrades.
4. The MIUI Optimized Charging feature limits the charge to 80%, but it should only be turned on overnight.
5. Update the firmware. Newer versions of MIUI often optimize power consumption.
6. Close the background applications. Use Battery → Power Saving Mode to save charge.
7. Keep your phone with 50% charge if you don’t use it for a long time (for example, during a vacation).

💡

The most harmful scenario for the battery is to play heavy games (such as Genshin Impact) while simultaneously charging, which leads to overheating and accelerated battery degradation.

How much does it cost to replace a battery in a service center vs on your own?

If you're not sure about your ability, you can go to the service, but the prices are much higher than if you replace them yourself. Here's a cost comparison table (2026):

Bottom Line: Self-replacement costs almost 2 times less, but takes time and care.If you have never disassembled your phones, practice on an old device or watch video instructions on YouTube (for example, from the Repair Universe channel).

FAQ: Frequent questions about replacing the battery with Redmi 7