How to carefully get the battery from Xiaomi Redmi 4: instructions with nuances

Xiaomi Redmi 4 is one of the most popular budget smartphones of 2016-2017, but even after years of battery replacement, its owners are faced with the need to replace the battery. Unlike modern models with non-removable batteries, Redmi 4 theoretically allows you to remove the battery, but the process requires caution: the wrong actions can lead to damage to the plumes, battery rupture or even fire.

It’s important to understand that the Xiaomi Redmi 4 (codenamed prada) has a glued battery, so removing it is closer to a mini-operation than a simple replacement. We’ll look at two methods – no disassembly of the body (if the battery is “bulging” and bulging) and complete disassembly (for deep cleaning or replacement), and also look at what tools are really needed and what can be done without.

If you've never taken a smartphone apart, you'd better go to a service center. But if you've decided to do it yourself, follow the instructions Step-by-step, without missing warnings. Redmi 4 batteries are prone to "bloating" because of their age, and forced removal without preparation can lead to short circuits.

Preparation: security tools and measures

Before you start, you can pack everything you need, and without the right tools, you're at risk of damaging the body, the plumes, or the battery itself.

• 🔧 Plastic mediators or shoulder blades (2-3 pieces) - for careful tweaking of the body. Metal tools can leave scratches.
• 🔥 Hair dryer or thermo-air station - for softening the glue (temperature not higher than 60-70)°C).
• 🧴 Isopropyl alcohol (90%+) — Acetone or solvents will not work!
• 🔋 New battery (if you are planning to replace) - original article MB51 analogue (BL-41A, BN41).
• 🧲 Magnetic screwdriver (cross, size) PH00) — hull-rotor.
• 🛡️ Gloves and safety glasses – in case the battery is damaged and emits gas.

Also, prepare your workspace: a table with good lighting, an antistatic mat (if any) and a screw container (so you don't lose it). Turn off your smartphone and wait until it's completely discharged, which will reduce the risk of short circuit. If the battery is swollen, don't plug the device into charging, and don't use metal tools near it.

⚠️ Warning: If the battery is severely deformed (bulges by more than 2-3 mm), its removal can be dangerous.

Method 1: Removing the battery without completely disassembling (if the battery is swelling)

If the Redmi 4 battery is swelling and lifting the back cover, you can try to remove it without completely dismantling the case, which is suitable when the battery has already moved away from the adhesive layer and can be seen through the slits.

1. Put your smartphone on a flat surface with your screen down. Carefully press the corners of the back cover, so if it's playing, the battery's already gone.
2. Insert a plastic mediator into the gap between the lid and the housing (start at the bottom edge where the charging connector is). Gradually swipe the mediator around the perimeter, trying not to touch the plumes.
3. If the lid is up, raise it 1-2 mm and try to gently tuck the battery on the side. Don't pull it by the wires!
4. Disconnect the battery connector (it is under the black protective tape), to do this, pluck the tape and snap the connector with a plastic blade.

If the battery doesn't respond, don't use force, you'd better go to the full disassembly method. Also remember, a bloated battery can be dangerous. If you hear a hiss or smell when you're extracting, stop the manipulation immediately and take the device outside.

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Method 2: Complete disassembly of Xiaomi Redmi 4 to replace the battery

If the battery doesn't swell but needs to be replaced, you'll have to disassemble the smartphone completely, and it'll take 30 to 60 minutes and it'll take patience.

Step 1: Removing the back cover

On Redmi 4, the lid is mounted on the latches and glue to remove it.

1. Heat the edge of the body with a hair dryer (10-15 seconds each) - this will soften the glue.
2. Insert a plastic mediator into the slot at the charging connector and carefully lead along the case.
3. When the lid begins to move away, do not remove it completely - under it are the plumes of the fingerprint scanner and antenna.

Step 2: Disconnecting the plumes

After removing the cover, you will see:

• 🔌 Battery connector (black, under tape).
• 📱 Footprint scanner plume (thin, goes to the top of the).
• 📡 Antenna contacts (metallic “twitches” on the sides).

First, disconnect the battery connector, then gently snap the scanner plume, and then pull the black lock upwards (it opens like a latch).

Step 3: Removing the battery

The battery in Redmi 4 is glued to the body to remove it.

1. Put a plastic blade on the battery from any angle, and if it doesn't respond, warm it up again with a hairdryer (maximum 70°C!).
2. Put a thin plastic card or mediator under the battery to separate it from the glue.
3. When the battery starts to go away, pull it evenly and slowly, without swaying.

If the glue is too strong, moisten it with isopropyl alcohol (a few drops under the edge of the battery) and wait 1-2 minutes. Do not use acetone or other solvents - they can damage the plastic of the case.

Step 4: Installation of a new battery

Before installing the new battery:

• 🧹 Clean the case of glue residues with alcohol and a napkin.
• 🔍 Check that there is no dirt or oxidation on the battery connector.
• 🔋 If the new battery is without glue, use double-sided scotch (for example, 3M 467 or Tesa 61396).

Connect the battery connector and check if it holds tight. Then assemble the smartphone in reverse order, making sure all the plumes are connected correctly.

What to do if the battery is damaged or swelled

If you notice that the battery:

• 🔥 It is swelled (thickness of more than 8-10 mm in the center),
• 💨 Emits gas (hisping, smelling),
• 🔋 Has traces of oxidation on the contacts,

Stop the manipulation immediately. These batteries can't be thrown into the trash, they can ignite.

1. Place the battery in a non-combustible container (such as a metal can of sand).
2. Take it to a recycling facility or service center (many workshops accept old batteries for free).
3. If the battery has already started to warm, do not touch it with your bare hands - use pliers and gloves.

⚠️ Warning: Never puncture a bloated battery or throw it into a fire. Lithium batteries, when damaged, emit toxic gases and can explode. In 2023, several cases of smartphone fires due to improper battery disposal were recorded in Russia.

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If you change batteries in older smartphones often, buy a special container to store damaged batteries, such as the LiPo Safe Bag, which can withstand high temperatures and prevent the spread of fire.

How to check a new battery before installation

Before installing a new battery in Xiaomi Redmi 4, make sure it is working.

1. External inspection: the battery should not have dents, scratches or traces of oxidation on the contacts, make sure that the label is intact (damaged label may indicate a fake).
2. Voltage check: Use the multimeter in DC 20V mode. Connect the probes to the battery contacts (red to +, black to -). Normal voltage is 3.7-4.2V. If it shows less than 3.5V, the battery is discharged or faulty.
3. Bloat test: Put the battery on a flat surface and press it a little bit, and if it bends or plays, then chemical processes have started inside, and you can't install that battery.

Also note the date of production (usually on the YYYY-MM label) if the battery is more than 1-2 years old, it could be in storage and lose capacity.

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Even the original battery can be defective. Always check the voltage before installation - it will take 2 minutes, but save you from re-disassembly.

Frequent battery replacement errors in Redmi 4

Many users make the same mistakes that lead to a smartphone breakage or a new battery fails quickly.

• 🔨 Use metal tools to slash the lid or battery – they can close contacts.
• 🔥 Overheating the body (above 80)°C) - this will damage the screen or plumes.
• 🔋 Install the battery without glue - it will hang around and can tear off the connector.
• 📵 Turn on a smartphone without a battery (even through charging) – this can burn the power controller.
• 🧹 Ignore contact cleaning – oxidation leads to poor contact and rapid discharge.

Another common mistake is that you don't build the right one, so if you forget to plug in the fingerprint scanner plume, the smartphone will work, but the sensor will stop working, and always check all the connectors twice before you finalize.

Alternatives to Replacement: How to Prolong Battery Life

If the battery in Redmi 4 is still holding a charge, but not as well as before, you can try to extend its life without replacing it.

• 🔄 Battery calibration: fully discharge the smartphone (before switching off), then charge to 100% without interruption. Repeat 2-3 times. This will help the controller correctly determine the level of charge.
• ⚡ Use of the original charger: Redmi 4 Supports Quick Charge 2.0, But not all power supplies are compatible. 5V/2A.
• 🌡️ Avoid overheating: Do not leave your smartphone in the sun or near heat sources. Optimal operating temperature is 10-35°C.
• 🛌 Storage with 40-60% charge: if you don't use your phone for a long time, discharge it to 50% and turn it off. Full discharge or 100% charge for long-term storage is harmful.

You should also turn off unnecessary background processes and reduce the brightness of the screen. In Redmi 4, go to Settings → Battery → Power Saving Mode and turn on the Super Power Saving option.

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Calibration of the battery only helps with the "failures" of the controller, but does not restore the physically worn out cells. If the capacity has fallen below 60% of the original, replacement is inevitable.

FAQ: Frequent questions about battery replacement in Xiaomi Redmi 4