How to change the battery Xiaomi Redmi 4A with your own hands

Smartphone Xiaomi Redmi 4A, released in 2016, has proven to be a reliable budget device, but time does not spare even the most durable gadgets. After a few years of active use, owners inevitably face degradation of the battery chemistry, which leads to rapid discharge and unexpected shutdowns. Self-replacement of the battery allows you to extend the life of your favorite device without overpaying for the services of the service center.

The replacement process requires care, because the body of the smartphone is glue-based, and the internal components are quite tightly arranged. The adhesive base of the cover is the main barrier that you have to overcome at the beginning of the journey. If you have never opened electronics, it is important to understand that rushing here is unacceptable: one wrong movement can damage the plumes or break the screen.

In this article, we will take a look at every step of the procedure, from tool preparation to final system calibration, how to safely detach the plumes, how to choose the right new battery among the many analogues, and what to do if the phone does not turn on after assembly. Restoring autonomy is not only a money saving, but also a useful skill for any owner of the equipment.

⚠️ Warning: Before starting any work, be sure to completely turn off the smartphone. Attempting to disassemble the enabled device is guaranteed to short-circuit and the motherboard will fail.

Preparation of the workplace and tools

Quality repairs start with the right organization of space. You'll need a clean, well-lit table where nothing distracts you. The absence of dust and small foreign objects minimizes the risk of losing tiny screws or getting debris inside the enclosure.

Successful battery replacement in the Redmi 4A will require a minimum set of tools that can be purchased from any radio parts store or ordered online. The main tool will be a plastic blade or mediator necessary to open the case without damaging the plastic. Metal objects are not recommended for use, as they can leave scratches or damage internal components.

You'll also need:

• 🔧 Set of screwdrivers (cross-haired) PH00 or PH000) motherboard-screw.
• 🔥 Hair dryer or building hair dryer for softening the glue under the back cover.
• 🧲 Magnetic mat or container for sorting screws so as not to confuse them when assembly.
• 🧴 Isopropyl alcohol or special solvent for removal of glue residues.

Make sure the battery model meets the specifications of your device. Xiaomi Redmi 4A usually uses a model labeled BM37, however it is always best to check compatibility by device code or visually compare old and new elements before installation.

⚠️ Warning: Never use an open fire (lighters, gas burners) to heat the case.The back cover plastic is easily melted and deformed, making it impossible to re-seal the case.

The process of disassembling the smartphone body

The first step in the replacement procedure is the removal of the SIM-This action is necessary to prevent damage to the internal machinery and facilitate the removal of the back cover, the tray is removed using a special clip included in the package or a thin needle.

Then comes the most important step: heating and removing the back panel. The glue that holds the lid becomes plastic when exposed to temperature. Heat the perimeter of the device evenly, without holding the hair dryer too long at one point, so as not to overheat the display matrix or internal components.

The sequence of actions during disassembly:

• 🌡️ Evenly warm the perimeter of the back cover with a hairdryer during 2-3 minutes before appreciable heat.
• 🔪 Carefully insert the plastic blade into the gap between the frame and the cover, starting at the lower corner at the charging connector.
• 🔄 Lead the shoulder blade along the perimeter, gradually snapping the adhesive layer, trying not to damage the plume of the fingerprint scanner (if it is connected to the cover).

Once you remove the lid, you'll see the inside of the smartphone, the motherboard is protected by a metal screen or plastic pad that is attached to multiple screws, screws can be of different lengths, so it's important to remember or draw the location of each of them, and if you confuse the screws during assembly, you can damage the circuit board or get stuck with a screw in the components, which will cause a malfunction.

Dismantling of the old battery

When the protective plate is removed, the battery socket and the battery are accessed. In the Redmi 4A, the battery is also locked to double-sided tape, which eventually loses its properties or is glued to the ground, and the main task is to remove the battery without damaging the shell.

The first thing you need to do is to disconnect the battery plume from the motherboard, and this should be done carefully, putting a plastic blade or nail on the connector, and in no case pull the wires or use metal tweezers, as this can lead to a short circuit of the residual charge.

The following methods can be used to extract the battery:

• 🎣 Suction cup use: attach the suction cup to the center of the battery and gently pull up while warming up the area under the battery with a hairdryer.
• 💳 Plastic card: if the battery sits tightly, gently push the plastic card or fishing line under the power cell, cutting the glue layer.
• 🧪 Chemical method: Drip some isopropyl alcohol under the edge of the battery (avoiding hitting the electronics) to dissolve the glue.

⚠️ Warning: It is strictly forbidden to pierce, bend or deform a lithium polymer battery. Damage to the inner lining can cause ignition or chemical burn.

If the old battery is swelling, you should handle it with extreme caution, bloating indicates a buildup of gases inside the housing, and any puncture can be dangerous, in which case it is recommended to immediately place the extracted battery in a non-combustible container.

Installation of a new battery and assembly

Before installing a new battery, you must carefully clean the seat of the residue of old glue. Use isopropyl alcohol and a lilac-free wipe to remove the sticky layer. A clean surface will ensure that the new battery is securely fixed and prevents it from being displaced during operation.

The new battery is usually already coated with adhesive, covered with a protective film. If there is no adhesive, use a special B-7000 glue or double-sided electronics tape. Apply the adhesive evenly, avoiding contact connectors and contacts.

Compatibility and Characteristics Table for Redmi 4A:

After installing the battery and connecting the plume, do not rush to immediately close the case. It is recommended to pre-check the device's health by connecting the charger. If the smartphone responds to charging and the screen lights up, you can proceed to the final assembly.

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When assembly, first snap the top of the lid (near the camera), and then gently press the bottom one. This will help avoid a gap at the top of the device.

Calibration and first launch

After the battery is replaced, the system may not display the charge level correctly, since the power controller has not yet “meeted” the new battery. To work correctly, you need to conduct a calibration procedure, which will allow the smartphone to correctly determine the percentage of charge and predict battery life.

The calibration process is as follows:

1. Discharge the smartphone before completely switching off (0%).
2. Connect the charger to the phone turned off and charge it to 100%.
3. Without turning off the charger, turn on the phone and make sure the indicator shows 100%.
4. Use the device in normal mode until the next full discharge.

In some cases, it may be necessary to reset battery statistics through an engineering menu or special applications, but for a Redmi 4A, one or two full charge-discharge cycles are usually enough.If after replacing the battery warms up or the phone discharges quickly, there may be a problem in the battery itself or the quality of the plume connection.

Typical errors and troubleshooting

Even when following the instructions, there can be unforeseen situations, and users often find that after assembly, the smartphone ceases to see. SIM-The fingerprint scanner is not working or not working, which usually indicates that the corresponding plumes are not connected tightly.

Another common problem is the peeling off back cover, and if you haven't used a new glue or you've degreased the surface poorly, the tightness will be compromised, so you can temporarily lock the lid with rubber bands until the glue is completely dry or use special tightening straps.

The main symptoms of improper installation:

• 📉 Quick discharge (less than) 2-3 screen clock) – a sign of defective battery or oxidized contacts.
• 🔥 Heating in the processor or battery area – possible short circuit or defect of the power supply.
• 📵 Network Disappearance – damage to antenna contact during careless disassembly.

If you notice that the percentage of charge "jump" (for example, from 40% drops sharply to 10%), this may indicate the need to flash the controller or replace the battery with a better one. MIUI.

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The quality of the placement batteries is more important than the speed of replacement, and a cheap one can fail in a month, negating all repair efforts.