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

Xiaomi Redmi Note 4 is one of the brand’s most popular smartphones, but even it has battery problems over time. Bloating, fast discharge or the need to replace force users to look for ways to remove the battery themselves. However, the design of the Redmi Note 4 (codenamed mido) involves a non-removable body, and improper disassembly can damage the plumes, display or even burn the lithium-ion battery.

This article will help you understand how to safely remove the battery from the Xiaomi Redmi Note 4 without having experience in repair. We will look at the necessary tools, step-by-step process, typical errors and alternative solutions (for example, when the battery is stuck to the body).

Before you start, consider: the warranty on the device will burn up after disassembling yourself. And if the smartphone is still under warranty, first check whether it covers the replacement of the battery (in most cases, yes, but only when you contact an authorized service).

Preparation: security tools and measures

To remove the battery from the Redmi Note 4, you will need:

• 🔧 Plastic blades (mediators) or special suction cups for disassembling smartphones. Metal tools can scratch the body or damage the plumes.
• ⚡ Isopropyl alcohol (90%+) — to clean the glue under the battery and remove residues of bilateral tape.
• 🔥 Thermoclee or bilateral tape - to fix the new battery (if you plan to replace it).
• 📱 Hair dryer or thermoplatform - for softening the glue (temperature not higher than 60-70)°C, otherwise damage the display!).
• 🔋 New battery (optional) - original art. MB39 analogue (BL-41A, BP41).

⚠️ Attention: Redmi Note 4 lithium-ion batteries can ignite or explode if damaged. Don't use sharp objects to tamper with the battery, don't puncture it or bend it. If the battery is swollen, it's best to trust the professionals to disassemble the battery!

Also prepare the workplace:

• 🪑 Work on a table with good lighting, without carpets (static electricity!).
• 📦 Put all cogs and parts in separate containers or on a magnetic mat.
• 🔌 Turn off the smartphone from charging and turn it off (it is advisable to discharge up to 20-30% to minimize the risk of short circuit).

Step 1: Removing the back cover

The Redmi Note 4 body is glued around the perimeter, so the first thing you need to do is carefully separate the back panel. Start by warming the edge with a hairdryer (keep it 5-10 cm away so you don't overheat the plastic). The temperature should be comfortable for the hand - if the body burns, stop heating!

Then proceed as follows:

1. Insert a plastic blade into the gap between the body and the display (it is better to start at the bottom edge, where the charging connector).
2. Carefully drive the shoulder blade along the body, separating the glue. If you feel resistance, warm up the place again with a hairdryer.
3. As soon as the lid begins to give in, do not pull it sharply: under it there are plumes of the fingerprint scanner and antenna contacts.

⚠️ Attention: On the Redmi Note 4, the fingerprint scanner plume is very fragile. If it is damaged, the sensor functionality will be lost.

Heated the edge with a hairdryer (60-70 ° C)

I use a plastic spatula, not a screwdriver.

Started with the bottom edge (near the charging connector)

I don't pull the lid by force - I separate the glue gradually-->

Step 2: Disconnecting the battery from the board

Once you remove the lid, you'll see the battery glued to the body, but before you remove it, be sure to unplug the battery connector from the motherboard, which is under a black protective tape (which you can tweez carefully).

Use a plastic blade to lift the connector up. Don't pull the wires! If the contact doesn't lend itself, check if it's glued, in which case, warm up the area a little bit with a hairdryer.

⚠️ Attention: If you don't disconnect the battery from the board before you take it out, you might short-circuit it by accidentally touching the contact tool, which could knock out the power controller or the board itself!

After turning off the connector, it is recommended to wait 2-3 minutes - this will discharge the residual voltage in the capacitors.

Step 3: Removing the battery

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

• 🧴 Isopropyl alcohol - a few drops under the battery will soften the glue. Apply carefully, avoiding hitting the board.
• 🧊 Thin plastic card - it is convenient to smack the battery, gradually separating from the case.
• 🔥 Hair dryer - warming up the body from the back (from the display side) will help soften the glue.

Procedure:

1. Apply alcohol along the perimeter of the battery (do not pour! 2-3 drops on the side are enough).
2. Wait 1-2 minutes for the glue to soften.
3. Carefully tuck the battery into a plastic card, starting at any corner. Don't try to pull it out right away -- separate it gradually, by a millimeter.
4. If the battery is “rimmed” – warm up the body with a hairdryer again and repeat the procedure.

⚠️ Attention: If the battery is blown up, don't do anything! The risk of damage and fire is very high.

Step 4: Install a new battery (optional)

If you have removed the battery for replacement, watch for:

• 🔌 Polarity – the connector must match the original (the battery has tags) + and −).
• 📏 Thickness: The new battery should not be thicker than the old one (maximum 3.85 mm).
• 🧴 Fixing – use bilateral Scotch or thermal glue (for example, B-7000).

Before installation, clean the seat of the old glue residue with isopropyl alcohol. The new battery should lie flat, without distortion. After fixing, connect the connector to the board and check if the battery is recognized by the system (turn on the smartphone).

⚠️ Note: After the battery is replaced, the Redmi Note 4 may show an incorrect charge level for the first 2-3 charge/discharge cycles. This is normal - the controller needs time to calibrate. Charge the phone to 100%, then discharge to 0% and repeat the cycle.

1. Is the battery connector properly connected to the board?

2.Are there any damages to the plumes (especially the fingerprint scanner).

3. Are the contacts closed on the board (look for darkening or burning smell).

If everything is fine, but the phone is not responding, maybe the power controller protection is working, plug the charger in and wait 10-15 minutes.

Frequent Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when disassembling the Redmi Note 4.

• 🔨 Using metal tools, scratches the body and can close contacts. Always use plastic!
• 🔥 Overheating with a hair dryer - if the temperature is above 70°C, the plastic is deformed, and the glue can dry even more.
• 💧 Excess alcohol – if it hits the board, can cause contact corrosion.
• ⚡ Forget to disconnect the battery from the board - the risk of short circuit when working with metal parts.

Another common problem is that the antenna contacts are damaged when the lid is not removed carefully, and they are located on the sides of the housing and they are responsible for the signal of the network, and if after assembly the quality of communication deteriorates, check if the contacts are bent and the antenna plumes are torn.

If you accidentally ripped off the fingerprint scanner's plume, don't panic: the smartphone will work, but you'll have to turn off the fingerprint unlock function. It'll cost 500 to 1,000 to replace the plume. ₽ service.

💡

The rule of thumb when disassembling the Redmi Note 4 is to take your time. Most damage is caused by sudden movements or force. If something doesn't work, pause, warm up again, or use alcohol to soften the glue.

When to take risks: signs of a dangerous battery condition

Some symptoms indicate that the Redmi Note 4 battery is in critical condition and it is dangerous to remove it at home.

• 🔋 Bloating of the case – if the smartphone became “blown” or the screen rose.
• 🔥 Overheating – the battery heats up even in standby mode (above 45)°C).
• 💥 Extraneous sounds – hissing or crackling when charging.
• 🔌 Unstable charging – the phone is charging, then not, or the percentage of charge jumps.

A bloated battery can break when mechanically exposed, so don't try to prick or bend it. Services use special boxes or vacuum suction cups to minimize risks.

If the battery has already started to leak (white plaque on the board or corrosion of contacts is visible), self-disassembly is also not recommended.

FAQ: Frequent questions about battery recovery