Replacement of the battery on Xiaomi Redmi Note 4: a complete guide with photos and videos

Xiaomi Redmi Note 4 is one of the most popular smartphones of 2017, but even its unbeatable 4100 mAh battery after 5-7 years of operation begins to “land” in half a day. If your device suddenly turns off at 30% charge, the discharge is enough for 3-4 hours of active use or the phone overheats during charging – it’s time to think about replacing the battery.

In this article, you will find a step-by-step instruction for replacing the battery with the Redmi Note 4 (including the Note 4X and Note 4 Pro versions with a Snapdragon 625), a list of necessary tools, criteria for choosing a quality battery and answers to frequent questions. We will also examine the unique feature of this model – the glued touchscreen plume to the battery, which is often damaged when sloppy dismantling.

Signs of battery wear: when is it time to change?

The Redmi Note 4 battery is designed for 500-800 full charge cycles (0% to 100%) and then starts to drop rapidly, and here are the key symptoms that the battery needs to be replaced:

• 🔋 Phone's running out of power. 2-3 hours in normal use (social networks, instant messengers, calls).
• 🔌 Charging jumps: for example, from 40% immediately drops to 15%, or the phone turns off at 20-30% charge.
• 🔥 The body heats up strongly during charging or gaming (especially in the battery area).
• ⚡ Battery bloating: The screen starts to "step away" from the body, gaps appear at the edges.
• 📉 In Settings menu → Battery → Battery state shows capacity less than 70% of the original.

If you see at least 2-3 signs on the list, a battery replacement is inevitable. You shouldn't delay repairs: a bloated battery can damage the screen or motherboard, leading to more expensive repairs.

⚠️ Warning: If the battery is swelling, don't try to prick it or squeeze it -- it could cause fire! Turn off the phone immediately and call the service.

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

The original Xiaomi batteries for the Redmi Note 4 (article MB38) today are almost not delivered, but there are quality analogues on the market. The main thing is not to run into a fake with a capacity 2-3 times lower than the declared.

Here are the criteria for choosing a good battery:

• 🔍 Capacity: at least 4000 mAh (original - 4100 mAh). Avoid "improved" versions of 5000+ mAh - this is a scam.
• 🏭 Manufacturer: proven brands – Patona, Baseus, Remax, ZMI (a subsidiary of Xiaomi).
• 📦 Packaging: Must have a hologram, QR- authentication code and production date (fresh 2023).
• 🔌 Connector: 3 contacts (plus, minus, thermistor) are required – some cheap analogues save on the thermistor, which leads to overheating.

Check on-site reviews (e.g. AliExpress, Yandex Market or Beru) before buying – often sellers post photos of real-life capacity tests. You can also use the AccuBattery app (available on Google Play) to check the status of the old battery and compare it to the new one after installation.

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Before you buy, ask the seller to send a photo of the battery with a multimeter showing the voltage. The norm for a new battery is 3.7-4.2 V. If less than 3.5 V is a marriage or a fake.

Necessary tools for battery replacement

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

• 🔧 Plastic blades (2-3 (a) - for the careful smearing of the hull and the disconnection of the plumes.
• ⚒️ Cross screwdriver (size) PH00) — hull-rotor.
• 🔥 Dryer or thermo-air station - to soften the glue under the battery.
• 🧲 Magnetic mat or container – so as not to lose screws.
• 🩹 Isopropyl alcohol (90%+) - for cleaning the glue after removal of the battery.
• 📏 Suction cup - will help to raise the screen (if required).
• 🔋 New battery with tested capacity and connector.

It is also recommended to use an antistatic bracelet or periodically touch a metal object (such as a heating battery) to remove static electricity - it can damage the motherboard.

⚠️ Warning: Don't use metal blades or knives to tweak the battery! This can puncture the battery and cause a short circuit or fire. Only plastic or nylon tools!

Turn off the phone and remove the SIM- card and memory card | Charge the phone to 30-50% (it is safer for the board) | Prepare a workspace with good lighting |Photograph the location of the screws and plumes before disassembling |Put on an antistatic bracelet or discharge static-->

Step-by-step instructions for replacing the battery

The process of replacing the battery on the Redmi Note 4 is more difficult than on many other smartphones, because of the touchscreen plume glued to the battery. If you act sloppy, you can damage the display. Follow the instructions carefully!

Step 1: Removing the back cover

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

2. heat the hair dryer back cover around the perimeter (temperature ~60 ° C) for 2-3 minutes - this will soften the glue.

3. Carefully apply the plastic blade to the bottom edge (near the USB-Type C connector) and slowly lead along the case. If the lid does not lend itself, warm up again.

Step 2: Disconnecting the plumes

1 Unscrew 10 screws (PH00 size) fixing the metal plate above the battery.

2. Carefully remove the plate and put it aside (screws are better folded on a magnetic mat).

3. Disconnect the plumes:

- Batteries (connector with 3 wires).

- Touchscreen (stick to the battery! Be careful!)

- Primary fee (if it interferes).

Step 3: Remove the old battery

1. Put a plastic shoulder blade on the battery from any angle and pull it up. If it doesn't lend itself, warm up with a hair dryer (maximum 70°C!) for 1-2 minutes.

2. Under the battery, you'll see double-sided tape. Carefully remove it with a spatula.

3. If the battery is swelling, do not press on it - remove slowly so as not to damage the board.

4. Clear the place under the battery with isopropyl alcohol from glue residues.

Step 4: Installation of a new battery

1. Check the connector of the new battery - it must match the old one (3 pins: +, -, thermistor).

2. glue double-sided tape (usually bundled with battery) or use B-7000 glue.

3. Connect the battery plume to the motherboard and fix it.

4. Make sure the battery is flat, without skewing.

Step 5: Assembly of the phone

1. Connect the touchscreen plume (if disconnected).

2. Set the metal plate and twist all 10 screws.

3. Stick the back cover, warm it up with a hair dryer for better fixation.

4. Turn on your phone and check the battery power in the Settings → Battery menu.

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The most critical thing is to disconnect the touchscreen plume, and if it breaks, you'll need to change the display (~3000-5000 ₽) and act carefully or leave it to the professionals.

Frequent Mistakes and How to Avoid Them

Even with a careful battery replacement, beginners often make mistakes that lead to new breakdowns.

• 🔌 Incorrectly shutting down plumes: Many forget to disconnect the battery before running the board, which can cause a short circuit.
• 🔥 Battery overheating: If you heat the dryer for longer than 3-4 minutes or higher than 70°C, the battery may swell or ignite.
• 🧲 Loss of screws: Redmi Note 4 has different lengths of screws – if you mix it up, you can damage the board.
• 📱 Touchscreen damage: The plume is very fragile - it cannot be bent or pulled.
• 🔋 Use of incompatible battery: Cheap analogues without a thermistor may not correctly display the level of charge.

To avoid problems:

• 📸 Photograph each step of the disassembly, which will help you build your phone properly.
• 🔧 Use only plastic tools to work with the battery.
• 🔋 Check the new battery with a multimeter before installation (voltage must be 3.7-4.2V).

⚠️ Warning: If the phone doesn't turn on after the battery is replaced, check: - Is the battery plume properly connected. - Is the motherboard damaged (check for darkening or burning smell). - Are the screws confused during assembly. If the problem persists, contact the service.

How much does it cost to replace the battery in the service?

If you're not sure about your abilities, you should trust a replacement to a professional, and the cost of the service in 2026 depends on the region and the type of battery:

Some services offer free diagnostics before replacing – this will help make sure that the problem is in the battery, and not in the power controller on the board.

Should you save on service? If you don't have experience disassembling phones, the risk of damage to the touchscreen plume or the fee is very high, in which case the savings in 1000-1500 ₽ can turn into repairs on 5000-10000 ₽.

What to do after replacing the battery?

Once you have installed the new battery, you need to calibrate it correctly so that the phone displays its charge level correctly.

1. 🔌 Completely discharge the phone before it turns off.
2. 🔋 Charge to 100% without interruption (use the original Xiaomi adapter on 5V/2A).
3. ⏳ Keep charging for an additional 1-2 hour after reaching 100%.
4. 🔄 Repeat the 2-3 discharge/charging cycle times to help the power controller get used to the new battery.

We also recommend:

• 📱 Update to the latest version – new firmware often optimizes power consumption.
• 🔋 Avoid full discharge - it is better to charge the phone at 10-20% charge.
• 🔥 Do not use your phone while charging for games or videos - this shortens battery life.

After 2-3 weeks, check the battery status in the AccuBattery application - if the capacity corresponds to the declared one, and the phone holds the charge as new, the replacement was successful!

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If the phone runs out quickly after replacing the battery, check the background processes in the Settings menu → Battery → Battery Use. Often unoptimized applications are to blame, not the battery itself.

FAQ: Answers to Frequent Questions