Independent battery replacement on Xiaomi Redmi Note 4: detailed instructions with photos and tips

Xiaomi Redmi Note 4 — one of the most popular smartphones 2017 And even if it runs out of battery over time, if your machine runs out in a couple of hours, it shuts down. 30-40% If you're charging or swelling under the back cover, it's time to change the battery. 1500 before 3000 RUB, but if you want you can save and do everything yourself.

In this article, you will find step-by-step instructions for replacing the battery with the Redmi Note 4 (including the Redmi Note versions). 4X Redmi Note 4 Pro with Snapdragon processor, a list of necessary tools, tips for choosing a new battery and unique nuances of disassembly of this model (for example, how not to damage the fingerprint scanner plume). We will also analyze the typical mistakes that beginners make, and give recommendations for calibrating a new battery.

How to know if the battery Redmi Note 4 is time to change: 5 key signs

Before you start replacing, make sure that the battery is the problem, sometimes the background, viruses or wear of the charging connector cause rapid discharge, and here are the exact symptoms of a dying battery:

• 🔋 Smartphone discharges by 50% in 1-2 hours during normal use (social networks, instant messengers).
• 📉 The percentage of charge jumps (for example, from 40% immediately to 15%) or the phone turns off by 20-30%.
• 🔥 The body swelled (noticeably in the gaps between the screen and the frame or "hump" on the back cover).
• ⚡ Charging is extremely slow or stops by 80-90% (even with the original adapter).
• 🌡️ The phone warms up strongly when charging or during games (the battery loses capacity and overheats).

If you have at least 2-3 items on your Redmi Note 4 list, it’s time to change the battery, and you can use apps like AccuBattery to make a final diagnosis. CPU-Z (checks voltage and temperature).

⚠️ Warning: If the battery is swollen, don't delay replacements! This battery can damage the screen, motherboard or even ignite when mechanically exposed.

What battery to choose for Redmi Note 4: original vs analogues

The original battery for the Redmi Note 4 is marked BM47 and capacity of 4100 mAh (voltage) 3.85V). However, after 2019, Xiaomi officially stopped supplying spare parts for this model, so you will have to choose between the two:

For most users, the best option is a new analogue from proven brands (for example, Camelion, Remax, Baseus).

• 📏 Exact dimensions: 146 × 72 × 3.8 mm (tolerance) ±0.5 mm).
• 🔌 Type of connector: must be the same as the original (2 contacts) + thermistor).
• 🔋 Capacity: Do not take batteries over 4500 mAh – they may not fit in or overheat.
• 🛡️ Protection: availability of charge/discharge controller and thermal sensor.

Buy the battery only in trusted stores (e.g. AliExpress with a seller rating of 98%+, Avoid offerings that are too cheap (below 500) ₽) — It is almost always a marriage or a forgery.

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Check the reviews for the specific battery model before buying, look for references to running time (should be at least 5-6 hours for average load) and heating (normal up to 40 hours).°C when charging).

Preparing for replacement: security tools and measures

To replace the battery with the Redmi Note 4, you will need:

• 🔧 Plastic blades (2-3 pieces) for dissociating the body.
• 🔨 Thin screwdriver (cross, size) PH00 or PH0).
• 🔥 Hair dryer or thermo-air station (for softening glue).
• 🧲 Magnetic mat or screw bowl.
• 🩹 Alcohol and cotton swabs (to clean contacts).
• 🔋 New battery (pre-tested multimeter).
• 📱 Spare smartphone (to capture the process or communication in case of failure).

Important: Work on a clean desk with good lighting. Redmi Note 4 has fragile plumes, especially a fingerprint scanner - one wrong move can tear them up. Also prepare a backup of the data (in case something goes wrong).

⚠️ Warning: Never use metal blades or knives to disassemble! they can close the contacts of the battery or scratch the case.°C is dangerous!

Turned off the phone and pulled it out. SIM-map|Prepared all the tools.|Checking out the new multimeter battery|I took off my cover and my protective film.|Put the phone on a soft surface.-->

Step-by-step: how to disassemble the Redmi Note 4 and replace the battery

The replacement process will take about 30-40 minutes, and follow the instructions carefully so as not to damage the plumes or board.

Step 1: Removing the back cover

1. Turn off the phone and remove the tray for SIM-map.

2. heat the hair dryer edge of the back cover (temperature 50–60)°C, hold it 1-2 minutes. That'll soften the glue.

3. Insert a plastic blade into the gap between the lid and the body (start at the lower corner where the charging connector is). Carefully drive the blade around the perimeter, separating the lid.

4 When the lid is removed, don't remove it completely, it's connected by a fingerprint scanner plume! Unplug the plume from the motherboard (it's latched).

Step 2: Disconnect the old battery

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

2. Take care of the plate and take it off. Underneath it, you'll see a battery with a connector.

3. Disconnect the battery connector from the motherboard. To do this, put a plastic spatula (not metal!).

4. Check the voltage on the contacts of the battery multimeter - it should be 0V (If not, the battery is not completely disconnected!).

Step 3: Remove the old battery

The battery in the Redmi Note 4 is glued to the body with double-sided tape to remove it:

1. Put a plastic shoulder blade on the battery from any angle.
2. Pull slowly and evenly, putting on the glue as you separate.
3. If the battery is swelling, don't prick it! It could cause a fire.
4. After removal, clean the body of the glue residues with alcohol.

Step 4: Installation of a new battery

1. Remove the protective film from the new battery (if any).

2. glue it to bilateral tape (comes with) or use the original glue (for example, B7000).

3. Connect the connector to the motherboard. Make sure it sits tight, without any skewing.

4. Return the metal plate to place and twist the screws (do not pull!).

Step 5: Assembly of the phone

1. Connect the fingerprint scanner plume to the motherboard.

2. Set the back cover, starting at the top (where the cameras are) and press it around the perimeter for fixation.

3. Insert the tray with SIM-map.

4. Turn on the phone and check the new battery.

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The most common build error is the wrong connection of the fingerprint scanner plume, so if the sensor doesn't work after assembly, take the phone apart and check the contacts.

Calibration of a new battery: why it is important and how to do it right

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.

Here's how to do it:

1. Full discharge: Use your phone before you turn off automatically (do not charge even if a low charge warning appears!).
2. Charging to 100%: Connect the original charger and wait for full charge (the indicator should show 100%).
3. After 100%, leave your phone charging for another 1-2 hours.
4. Repeat steps 1-3 2-3 more times to help the controller remember the actual capacity.

You can also use the Xiaomi engineering menu to reset battery data:

1. Enter the dialer code: ##4636##.
2. Select Battery Information.
3. Click Reset Battery Statistics (if there is one).

After calibration, check the phone's operating time.Normally for the new Redmi Note 4 battery:

• 📞 Conversations: 12-15 hours.
• 🎮 Games: 4-5 hours.
• 📱 Mixed use: 6–8 hours.

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If after calibration the phone still discharges quickly, check the background processes in the battery settings (Settings) → Battery → Battery use: Messengers (Telegram, WhatsApp) or social media (TikTok, Instagram) are often to blame).

Common Mistakes When Replacing a Battery and How to Avoid Them

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

If the phone does not turn on after replacement, check:

• 🔌 Connecting the battery connector (it may not have sat down until the end).
• 🔧 Whether all screws are twisted (uncrewed can close contacts).
• 📱 Status of plumes (especially fingerprint scanner and display).

If nothing helps, try connecting your phone to charge for 10-15 minutes – sometimes a new battery is discharged to zero and needs an initial recharge.

What to do if there are problems after replacing the battery

Even if you replace it correctly, you can have problems, and let's look at the most common ones and the ways you can solve them.

1. The phone is not switched on

Possible causes:

• 🔋 The battery is not connected or is not connected correctly.
• 🔌 Short circuit on the board (for example, due to metal shavings from screws).
• 📱 Damaged feeding plume or motherboard.

Solution: Take your phone apart and check all the connections. If the charge is damaged, contact the service.

Fast discharge of the new battery

Possible causes:

• 🔋 Battery defective or fake.
• 📱 No calibration has been performed.
• 🤖 Background processes or viruses.

Solution: Check the battery with a multimeter (voltage should be 3.7–4.2V). If everything is in order, perform a calibration and check the phone for viruses.

3.The phone is warm or does not hold charge

Possible causes:

• 🔥 A battery with increased capacity (e.g., 5000 mAh) is not compatible with a charge controller.
• 🔌 Failed charging connector or adapter.
• 📱 Battery plume damaged.

Solution: Try another charger. If the problem persists, replace the battery with the original or the equivalent with the right capacity (4100 mAh).

4.The fingerprint scanner is not working

Possible causes:

• 👆 The scanner plume is not connected or damaged.
• 📱 Contacts contaminated or oxidized.

Solution: Take the phone apart and check the plume. Clean the contacts with alcohol. If the plume is torn, you'll need a replacement.

⚠️ Note: If after replacing the battery, the phone began to restart or turn off with 20-30% charge, most likely, the problem is in the power controller on the motherboard.

FAQ: Frequent questions about replacing the battery with the Redmi Note 4