How to remove the battery from the smartphone Xiaomi Redmi: a detailed guide

Modern mobile devices, including popular models from Xiaomi and Redmi, are designed with maximum tightness and compactness, which makes the procedure of self-replacement of the battery complex engineering process. Unlike older phones with removable covers, here a non-removable battery is attached to a special adhesive compound, and access to it is blocked by glass panels and metal frames.

The main difficulty is that the back cover is glued around the perimeter, and careless movement can lead to its splitting or damage to the display.In addition, inside the case there are thin plumes connecting the main components, the rupture of which requires expensive repair or replacement of components. Before starting work, it is important to assess your skills and the availability of a specialized tool, since ordinary household items will not work here.

If you do decide to proceed, remember that the warranty on the device will be completely canceled after opening the case. However, for experienced users who have expired warranty period or the battery has deteriorated so much that the phone no longer holds charge, this guide will become an indispensable assistant. We will look at all the steps from the preparation of the workplace to the final test of the system health.

Tools and workplace preparation required

Quality repairs start with the right organization of space. You'll need a clean, well-lit table, preferably with antistatic coating or just no pile. Small parts like screws and plugs tend to get lost at the most inopportune moment, so prepare a magnetic mat or containers for sorting in advance.

To successfully dismantle the back and remove the battery, you will need a specific set of tools.Do not try to replace professional equipment with kitchen knives or pins, as this is guaranteed to lead to damage.

• 🔥 Hair dryer or heating pad - necessary to soften the glue under the cover (temperature about 80-90 degree).
• 🔧 Suction and mediators (plastic blades) - for careful peeling off of the body without chipping.
• 🪛 Torx (stars) and Phillips screwdrivers – Xiaomi often uses screws of different standards.
• 🧴 Isopropyl alcohol or special liquid B-7000 — glue-dissolving.

Pay special attention to safety. Lithium polymer batteries are sensitive to puncture and heat. If you damage the battery shell, you may experience a fire or chemical burn. Also, remember to turn off the device before you start any manipulations, although in modern models this is done after a partial opening.

The process of dismantling the back cover of the smartphone

The first step is always to remove the tray for SIM-This action relieves the internal pressure in the case and prevents the formation of a vacuum that can interfere with the separation of the lid.

Next, heat the perimeter of the device. Turn on the dryer at average power and evenly warm the edges of the smartphone during the course of the day. 2-3 Do not keep the hot air flow in one spot for too long so as not to damage it. OLED-It should feel like you're holding a cup of hot tea in your hand -- tolerated, but hot.

⚠️ Note: If your smartphone body has a glass back, be extremely careful when using a suction cup.The glass may crack from uneven pressure or spot heating.

After warming up, attach the suction cup to the bottom of the back cover and gently pull up, creating a small gap. Insert a thin plastic mediator into the resulting gap. The movements should be sliding, not stabbing. Driving the tool along the faces, gradually cutting the adhesive layer.

Don't try to open the case with a jerk. The glue in different Redmi models behaves differently: somewhere it is soft and viscous, somewhere it is hard and brittle. If the lid does not respond, apply heating again. Successful opening of the body is 50% of the success of the entire operation.

Disassembly of the internal structure and access to the battery

When you remove the back cover, you'll see the inside of the smartphone, and most Xiaomi and Redmi models have plastic protection or a metal plate behind the lid that covers the main components, and can also be glued or screwed.

Look carefully at the screws. They can be hidden under stickers or plugs. Unscrew all visible fasteners using a suitable screwdriver. Remember that the screws can be of different lengths, so fix their position relative to the body, so that when you build, you do not screw a long screw into a short hole and damage the board.

The next critical point is to turn off the battery plume, and even if the phone is off, there may be enough residual charge left on the contacts to short-circuit, and find the battery connector on the motherboard.

• 🔌 Carefully tuck the connector with a plastic blade, without using metal.
• 🔋 Make sure the plume has moved away from the contact area without distortions.
• 🛑 Only after disconnecting the plume can the disassembly continue further.

Now that the power is off, you can start removing the battery itself, which in modern smartphones occupies almost the entire interior area and is fixed to double-sided high-adhesion tape, and simply pulling the tongue (if any) is often not enough.

Technology of safe recovery of the battery

The most critical step is to separate the battery from the body. Xiaomi Redmi models use a very aggressive glue that only strengthens the grip over time. Trying to simply tamper with a battery with a knife or screwdriver is almost guaranteed to damage it and cause a possible fire.

There is a proven method using a thin thread (such as a dental floss or fishing line) wrap the thread around your fingers and gently insert it under the edge of the battery. The movements should be sawing, left to right and top to bottom. You will gradually cut the glue layer.

To make it easier, you can add a few drops of isopropyl alcohol under the battery through the gaps that form, and the alcohol dissolves the glue, making it less viscous, but be careful: the liquid must not get onto the connectors or into the chamber.

⚠️ Note: Metal tools are strictly forbidden to use to smack the battery. The puncture of the lithium-ion cell shell causes an instant chemical reaction, releasing heat and smoke.

If the battery is swelling, you need to work with it many times more carefully, bloating indicates a violation of internal processes and accumulation of gases, pressure on such a element can lead to depressurization, in which case it is better to extract it with protective gloves and glasses, and prepare the place for recycling the old battery in advance.

Installation of a new power supply and assembly

Once the old battery is successfully removed, you need to thoroughly clean the seat of glue residues. Use a plastic blade and a cotton pad moistened with alcohol. The surface must be perfectly smooth and fat-free, otherwise the new battery will not stick reliably.

The new battery is usually already glued, and if it's not there, use double-sided electronics tape or a thin layer of B-7000 glue. Don't overdo it with the amount of glue, because the glue can squeeze out when pressed and stain other components.

Set the battery in place, press gently and plug the plume into the motherboard. The connector should snap with a slight, barely audible click. Check the density of the connection by swaying the connector slightly (no effort).

Now you can start to reverse assemble. Set the protective plate, twist all the screws in the right order. Before sticking the back cover, be sure to check the health of the smartphone: turn it on and make sure that it responds to charging and shows the correct percentage of charge.

Calibration and initial launch

After the battery is replaced, the system may not display the charge level correctly, since the memory controller still "remembers" the parameters of the old element. To work correctly, you need to conduct a calibration procedure, which will help avoid situations where the phone turns off at 20% charge.

Discharge the smartphone until it's completely turned off. Then set it to charge when it's off until it reaches 100%. Then turn it on without being removed from charging, and wait until it's fully loaded. If the indicator is not 100%, keep charging.

Repeat the full discharge and charge cycle 1-2 times, allowing the power controller to calibrate to the new battery capacity. In modern versions of MIUI, this process often occurs automatically in the background, but manual calibration will not be unnecessary.

• 📉 Completely discharge the phone to 0%.
• 🔌 Charge to 100% in the off state.
• 🔄 Do one full cycle of work (discharge-charge) in normal mode.

Possible problems and ways to solve them

Even if you follow all the instructions, there can be unexpected situations, and one of the common problems is that the phone doesn't turn on after assembly. First of all, check the battery plume connection. The connector may not be fully installed or skewed.

Another common issue is the proximity sensor error or the appearance of a yellow spot on the screen, which can happen if you misfold or damage the display plume during assembly, and it is also worth checking if you forgot to put the speaker pressing plate in place, which often affects the sensor.

If the phone turns on but quickly discharges or warms up, you may have purchased a poor-quality copy of the battery.The market is saturated with fakes that are visually indistinguishable from the original, but have a real capacity 2-3 times smaller than the declared. Check the battery with special utilities, such as AccuBattery or through the Xiaomi engineering menu.

⚠️ Warning: If after the battery is replaced, the phone shows a message about an “Unlicensed battery” or constantly beeps when charging, this may indicate the absence of a protection chip on the new element or a software lock.

In case of serious errors, such as Battery Status: Unknown, you may need to reset or flash the device, but most often the problem lies in the physical contact or quality of the part itself.

Frequently Asked Questions (FAQ)