How to change the battery on Xiaomi Redmi Note 7: a detailed guide with photos

Why the Redmi Note 7 Battery Fails and When to Change It

Xiaomi Redmi Note 7, released in 2019, is equipped with a non-removable battery capacity of 4000 mAh. Over time, even the original battery loses up to 30-40% of capacity after 500-700 charging cycles. If your device discharges in 3-4 hours with moderate use, spontaneously turns off 20-30% of charge or overheats during charging - these are sure signs of battery degradation.

The manufacturer claims a battery life of 800-1000 cycles, but in practice the real life depends on the operating conditions. Frequent overheating, the use of non-original chargers and discharge to 0% accelerate wear. Importantly, the Redmi Note 7 does not support fast charging above 18W - the use of more powerful adapters (30W+) reduces battery life by 15-20%.

When is it time to change the battery?

• 🔋 Phone discharges from 100% to 0% in less than 6 hours without active use
• 🔥 The body is noticeably heated in the battery area even for simple tasks.
• 📉 Apps like AccuBattery show wear over 50%
• ⚡ Charging is interrupted or the phone is disconnected when connected to the network

What tools will be needed to replace

To replace the battery on the Redmi Note 7, you will need a specialized set of tools. Without them, the risk of damage to the plumes or display increases 3 times.

• 🔧 Plastic mediators (2-3 (S) for a careful sliding of the lid
• 🔨 The screwdriver. PH00 — hull-rotor
• 🧲 Suction cup (∅40-50 mm) - helps to remove the front panel
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C)
• 📦 New battery with labeled only BM47 or DM47 (original or certified analogue)

Pay attention to the quality of the battery. Cheap Chinese (< 800₽) They often have real capacity. 3000-3500 mAch instead of the declared 4000 MAC.Trusted brands:

⚠️ Warning: Do not use metal tools to lid the lid - even a small scratch on the aluminum case can become a focus of corrosion.

Step-by-step: how to disassemble Xiaomi Redmi Note 7

Disassembly of the Redmi Note 7 requires care: under the back cover are hidden fragile plumes of the display and camera.

1. Turn off the phone and remove it. SIM-Wait for the case to cool down completely (if the phone was in use).
2. Heat the back cover with a hair dryer for 2-3 minutes, holding it at a distance of 5-7 cm. The glue under the cover becomes elastic at a temperature of ~70 ° C.
3. Put the lid on a plastic mediator starting at the lower left corner (there are fewer plumes), insert the mediators into the gap so that the lid does not stick back.
4. Carefully remove the lid as you move around the perimeter, and if you feel resistance, warm up the problem area again.

After removing the cover, you will see:

• 🔋 Battery with connected connector
• 📸 Main camera module (3 lenses)
• 📶 Antenna contacts (do not touch them with metal objects!)
• 🔌 Display and fingerprint sensor plumes

Turn off the phone and remove it SIM-map|

Warm the back cover with a hair dryer (70°C)|

Push the cover with a plastic mediator from the lower left corner |

Disconnect the battery before further disassembly-->

⚠️ Warning: Don't pull the lid with force, because underneath it are the plumes of the fingerprint sensor and the vibrating motor, and it's going to cost you damage to the print plume. 1500-2000₽ substitute.

Disconnecting and removing the old battery

Before you can get the battery, you have to disconnect it from the motherboard.

1. Find the battery connector (usually located next to the bottom of the battery, marked in red or orange).
2. Carefully put the jack on a plastic spatula. Don't use metal tools!
3. After turning off, check the voltage on the battery contacts with a multimeter - it should be 0 V.

Now we can start retrieving, and the battery in the Redmi Note 7 is glued to the body with double-sided tape, so that it can be removed.

1. Put a plastic card on the battery in a place where there are no components (usually to the right of the camera).
2. Pull slowly upwards, heating with a hair dryer if necessary (maximum 80°C).
3. If the battery fails, don't force it! Reheat it again or use isopropyl alcohol to dissolve the glue.

Recycle the old battery according to the rules of your region. Do not throw it in ordinary garbage! In Moscow and St. Petersburg, there are battery reception points in the Svyaznoy and M.Video stores.

💡

If the battery glue is left on the case, remove it with isopropyl alcohol (90%+) and a plastic spatula. Acetone or solvents will damage the antenna tracks!

Installation of a new battery and assembly of the phone

Before installing a new battery, check the contacts on the motherboard, if they are oxidized (green coating), clean them with a blower or alcohol.

1. Remove the protective film from the new battery (if any).
2. Stick double-sided tape (comes with battery) onto the body in the same place where the old battery was.
3. Carefully install the battery starting from the top (where the contacts are located).
4. Connect the battery connector to the motherboard. It should snap with a click.

Before final assembly, check:

• ✅ All plumes are connected (display, camera, fingerprint sensor)
• ✅ No foreign objects inside the case (screws, scotch clippings)
• ✅ The battery is flat, without distortions.

Close the back cover, starting at the top, press it around the perimeter for a secure lock, turn on the phone and check:

• 🔋 Charging is stable (without percentage jumps)
• 📱 Sensor and display work without artifacts
• 📸 The cameras are focusing correctly.

💡

If the phone doesn't turn on after you've replaced it, check the battery plume and the power connector on the motherboard, and 90 percent of the time, they're the problem.

Calibration of the new battery: why it is important

The new battery requires calibration, a process where the power controller learns to correctly determine the charge level, and without calibration, the phone can show 100% charge, and after 10 minutes suddenly shut down.

How to calibrate:

1. Charge your phone to 100% original charger (5V/2A).
2. Unplug the network and use the phone until it is automatically turned off (don’t manually turn it off!).
3. Connect to charging and wait 100% without interruptions.
4. Repeat the discharge / charge cycle 2 more times.

After calibration, check the actual battery capacity in the engineering menu:

##4636## → Battery → Charge level

Health should be close to 100%, and if it is below 95%, battery failure or power controller problems may occur.

Frequent Mistakes and How to Avoid Them

Even with a neat replacement, users often make mistakes that cause their phone to break down.

Another common problem is that the phone doesn't turn on after it's replaced.

• 🔌 Unconnected display or battery plume (check connectors)
• 🔋 Failed battery (check the voltage multimeter - should be) 3.7-4.2V)
• 📱 Downed settings BIOS (It is solved by flashing through Fastboot)

⚠️ Warning: If after replacing the battery, the phone turns on, but does not charge - the problem may be in the future. USB-port (contact oxidation) or power controller (diagnosis is required at the service center).

FAQ: Answers to popular questions