How to remove the battery from Xiaomi Redmi Note 4: disassembly without damage

Replacing the battery with the Xiaomi Redmi Note 4 is a challenge that every smartphone owner faces sooner or later. The model released in 2017 is still popular due to its reliability, but the battery capacity inevitably decreases over time. If the phone starts to run out in a few hours, spontaneously turn off or swell, it's time to think about replacing the power source.

But removing the battery from the Redmi Note 4 is not an easy process. Unlike older phones with removable lids, it's glued into the case, and the inside hides fragile plumes and chips. Disassembly errors can cause damage to the motherboard, a break in the display cable, or even a short circuit. This article will help you figure out how to dismantle the battery yourself without going to the service center.

Before you start, consider your own strength: if you've never taken down a smartphone, it might be better to leave the job to professionals, but if you're willing to take risks, follow the instructions carefully, without rushing.

Preparation for disassembly: tools and security measures

To remove the battery from the Xiaomi Redmi Note 4, you will need a specialized set of tools. Don't try to do anything at hand, it can damage the body or internal components.

• 🔧 Plastic blades (bear cubs) - for careful liding and disconnection of adhesive joints.
• 🔨 Screwdriver cross (PH00) — for twisting screws in the lower part of the body.
• 🔥 Dryer or thermo-air station - to soften the glue holding the battery.
• 🧴 Isopropyl alcohol (90%+) — cleaning up glue residues and contacts.
• 🛡️ Antistatic bracelet (optional) – protects the board from static electricity.

Also, prepare your workspace: it should be well lit, free of dust and moisture. Work on a table with a soft substrate (like a silicone mat) so you don't scratch the glass or body. Never disassemble your phone on a carpet or couch - static electricity can damage chips.

⚠️ Warning: If the battery is swollen (the phone cover is raised or the body is deformed), do not try to pierce or heat it above 60.°C - risk of fire or explosion! In this case, immediately contact the service.

Before starting work, turn off the phone completely and remove it. SIM-If the battery is less than 25% dead, it is recommended to bring it to this level, so the risk of short circuit when disconnecting contacts will be reduced.

Step 1: Removing the back cover

The Redmi Note 4 has screws and glue attached to it, so you'll have to tweak it carefully. Start by unscrewing the two screws at the bottom of the phone (near the Micro-USB connector), which are hidden under the plugs -- remove them with a plastic blade or a nail.

Next, take a plastic blade and insert it into the gap between the lid and the screen. Start at the lower left corner (near the volume button) and carefully steer the tool along the body, separating the latches. Do not use force - if the lid does not respond, warm it up with a hairdryer (temperature not higher than 50 ° C) for 1-2 minutes.

• 🔹 Do not use metal tools – they will scratch the body and can close the contacts.
• 🔹 If the lid cracks - this is normal, but do not allow sudden movements.
• 🔹 After removing the cover, do not pull it sharply upwards - a fingerprint scanner plume is attached to it.

When the lid is removed, put it aside. Underneath it, you'll see:

1. Battery with plug-in.
2. Fingerprint scanner plume (stick to the cover).
3. Screws that fix the motherboard.

Spin screws at the bottom of the phone

Spin plugs removed

Heated body hair dryer (if necessary)

A plastic spatula is being used.

Fingerprint scanner plume intact-->

Step 2: Disconnecting the battery from the board

Before you remove the battery, be sure to unplug it from the motherboard, find a small black connector with an orange or red marker (usually located near the bottom edge of the battery), gently tuck it in with a plastic spatula and unplug it.

Don't pull the wires! The connector should come out perpendicular to the circuit board without effort. If it doesn't respond, check if other plumes are caught.

⚠️ Warning: If the battery is turned off suddenly (even for a second), this is a sign of a short circuit. Immediately stop work and contact the service - further disassembly is dangerous!

After the battery is turned off, it is recommended to wait 5-10 minutes to discharge the residual voltage in the circuit board capacitors, and you can also press the power button for 10-15 seconds to discharge the circuits.

Step 3: Battery Removal – Methods and Nuances

The battery in the Redmi Note 4 is glued to the body with double-sided tape, and you'll need to soften the glue to remove it.

1. Warm up with a hair dryer: Heat the battery from the back (through the body) for 2-3 minutes, holding the hair dryer at a distance of 5-7 cm The temperature should not exceed 60 ° C - check with your hand (should be hot, but tolerant). After warming up, gently tuck the battery with a plastic card or a spatula on the side.
2. Use isopropyl alcohol: Put a few drops of alcohol under the edge of the battery (it dissolves the glue). Wait 1-2 minutes and try to move the battery. The method is less aggressive, but takes longer.

Start the extraction from the top right corner (near the camera) — there are fewer plumes. Grab the battery a little bit without trying to tear it off right away. If it doesn't respond, warm it up again. Don't use a knife or a screwdriver — they can puncture the battery!

There are plumes hiding under the battery. NFC-Be careful, they're easy to damage. If the battery is up but not out, make sure it's clinging to those elements.

Step 4: Installation of a new battery

Before installing a new battery, clear the seat of glue residue. Use isopropyl alcohol and a lilaless wipe. Make sure there is no dirt or oxidation on the board contacts - wipe them with alcohol if necessary.

Set the new battery in the following order:

1. Remove the protective film from the adhesive base (if it is on a new battery).
2. Carefully put the battery in place, combining contacts with the connector on the board.
3. Press it evenly throughout the area so that the glue is grasped.
4. Connect the battery connector to the board (it should click with a slight click).

If the new battery is not adhesive, use double-sided tape (e.g. 3M 467 or 3M 468). Cut the strips by battery size and paste them on the case before installation.

⚠️ Note: After the battery is replaced, the Redmi Note 4 may show an incorrect charge level in the first few charge-discharge cycles.

💡

Before you first charge your new battery, fully discharge the phone (before you turn it off), then charge it to 100% without interruption, which will help the power controller correctly determine the capacity.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing batteries, and here are the most common problems and ways to prevent them:

• 🔋 Display plume damage occurs when you push too hard on the screen when you remove the lid. Solution: Use a screen suction cup or start disassembling from the opposite side.
• 🔥 Battery overheating can cause bloating or fire. Solution: warm in short intervals (30 seconds) and check the temperature with your hand.
• 🛠️ Loss of screws or plugs - small parts are easily lost.Solution: fold them in a magnetic bowl or onto sticky tape.
• 📵 The phone doesn't turn on after assembly -- it's often the fault of an unconnected battery connector or a plume. Solution: disassemble the phone again and check all connections.

If after the battery replacement Redmi Note 4 began to overheat or discharge quickly, the following reasons are possible:

1. Poor battery (buy only original or certified analogues).
2. Poor contact in the battery connector (check if it is bent).
3. Damage to the power controller on the board (diagnosis is required).

💡

If the battery is not turned on after the battery is replaced, the first thing you do is check the connection of the battery connector and the display plume. In 90% of cases, the problem lies there.

Where to buy a battery for Redmi Note 4 and how to choose a high-quality battery

The original Xiaomi Redmi Note 4 batteries are labeled BM43 or BM44 and have a capacity of 4100 mAh. However, the market is full of fakes that can last six months.

• 🏷️ Packaging – the original comes in a white box with a Xiaomi hologram and a barcode.
• 🔍 Marking – the battery must be marked with a model (BM43), capacity and production date.
• ⚖️ Weight – the original battery weighs about 45-50 grams. counterfeiting is often easier.
• 🔋 Contacts – high-quality batteries are gilded, without traces of oxidation.

Buying a battery is better in the checked places:

1. Official Xiaomi service centers (warranty 6-12 months).
2. Large online stores (e.g. AliExpress with a seller rating above 98%).
3. Specialized parts stores (check reviews).

The average price of the original battery is 1500-2500 rubles. Cheap analogues (up to 1000 rubles) often have an understated capacity and quickly fail.

FAQ: Answers to Frequent Questions