Xiaomi Redmi 9 has proven to be a reliable device with a capacious battery, but over time, even the best lithium polymer cell loses its capacity. Users begin to notice that the phone quickly discharges, spontaneously turns off at 20-30% charge or requires constant recharging throughout the day.
The process of retrieving the battery in modern monoblock smartphones is much more complicated than in devices with removable covers of the past decade. You will need not only a new battery, but also a set of special tools, as well as patience to not damage the plumes or the back panel. Wrong actions can damage the display or bloat the old battery, so it is important to follow the algorithm clearly.
In this article, we will discuss in detail how to pull the battery from the Xiaomi Redmi 9, what tools you will need for safe dismantling and what nuances you should pay special attention to. Compliance with all the stages will allow you to extend the life of your favorite gadget without contacting the service center, saving time and budget.
Tools and workplace preparation required
Before any manipulation of the internal components of the smartphone, it is necessary to organize a safe working space, the surface should be clean, well-lit and free of unnecessary objects, so that small screws or parts do not get lost. It is extremely important to work in good lighting, since plumes and connectors are miniature in size.
To successfully perform the procedure, you will need a specific set of tools that are not always found in a standard home medicine cabinet or a screwdriver drawer. Lack of the right tool can lead to the failure of the screw faces or damage to the body.
- 🔧 Sets of screwdrivers (mandatory Phillips bit #00 or #000 for small screws).
- 🔥 Hair dryer (construction or household) for softening the adhesive layer under the back cover.
- 💳 Plastic card or mediator for gently snapping the body without scratches.
- 🧲 Magnetic mat or screw sorting tank so as not to confuse them when assembly.
Special attention should be paid to the suction cup, which will help to pull the back panel after heating. If there is no special suction cup, you can use a case with a suction cup for the phone, but you will have to act extremely carefully. Also prepare isopropyl alcohol or a special liquid B-7000 for the subsequent fixation of the new battery, if necessary.
Precautions for working with lithium polymer batteries
Battery management requires strict safety precautions, as there is a reactive electrolyte inside. Damage to the battery shell can cause fire or explosion, especially if a short circuit occurs. Never attempt to pierce, bend or severely mechanically impact the battery.
⚠️ Warning: If you notice that the old battery is swelling, do not press it or pierce it, in this condition it is extremely unstable and requires disposal at a specialized reception point.
Before disassembling, be sure to turn off your smartphone. Even if the device is discharged, there may be residual voltage in the circuit, which is dangerous for the power controller.
It is also important to remember static electricity, which is harmful to electronic components, and it is recommended to touch a grounded metal object or use an antistatic bracelet before touching the internal boards, which will prevent accidental discharge that can disable the motherboard.
Removal of the back cover Xiaomi Redmi 9
The Redmi 9 has a plastic case that is attached to adhesives around the perimeter. SIM-This is a map to allow air to escape and to prevent vacuum from being created inside the housing when heated, and it's also going to make it easier to separate the lid.
Heating the back is a critical step: Turn on the dryer at the average temperature and evenly warm the perimeter of the device for 2-3 minutes. Do not hold a jet of hot air in one point for too long, so as not to overheat the display on the back side or melt plastic elements.
- 🌡️ Evenly warm the edges of the body, moving the hair dryer in a circle.
- 👐 Periodically check the softness of the glue, slightly pressing the sucker.
- 🚫 Do not overheat the area around the camera so as not to damage the module.
After enough warming up, stick the suction cup at the bottom of the back cover and gently pull up, creating a small gap. Insert a plastic card or mediator into the resulting gap and start leading along the faces, cutting the glue layer. Move slowly so as not to damage the fingerprint scanner plume, which is often attached to the lid.
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If the glue doesn't lend itself, warm up the case again. Don't use force to keep the back panel from cracking.
Dismantling the protective panel and disconnecting the plumes
When you remove the back cover, you'll see the inside of your smartphone, which is covered by a plastic protective pad, and it covers the main components, including the battery, the charging connector and the plumes, and it's attached to several screws that you need to unscrew.
Use a Phillips screwdriver of the appropriate size to gently twist all the visible screws on the protective panel. Fold them into a prepared container, keeping order, as the screws may differ in length. Once the fastener is removed, the panel can be removed by tweaking it with a plastic blade.
| Component | Location. | Action. |
|---|---|---|
| Protective panel. | Central part | Turn the screws around the perimeter. |
| Battery plume | Top of the pay | Turn it off first. |
| Display plume | Near the battery. | Do not touch unnecessarily |
| antenna wire | The bottom part | Click carefully |
The most important step before removing the battery is to turn off the power plume, find the battery connector on the motherboard and gently disconnect it with a plastic blade or nail, and shut down the power before any manipulation of the battery itself to avoid short circuit.
☑️ Preparation for recovery of AKB
Technology of extracting the battery from the body
In the Xiaomi Redmi 9, the battery is attached to the inner frame on a double-sided tape. Over time, the glue can lose its properties or, conversely, "stick" dead, the main task is to separate the cell without damaging its shell and without deforming the body.
Start by gently tweaking the battery with a plastic card or a special spatula at one of the edges. Do not use metal tools, as they can penetrate the lithium-polymer layer. Move slowly, gradually penetrating the entire surface of the battery.
⚠️ Warning: It is strictly forbidden to use a knife or sharp metal objects to pick the battery.One wrong engine will cause the contents to instantly ignite.
If the battery is very tight, you can slightly warm the area under it with a hair dryer through the back cover (if it is removed, warm it carefully on the back side of the body) or use special adhesive solvents. However, in Redmi 9, mechanical action with moderate force is usually enough.
Once you have freed one side, continue on the perimeter until the battery is fully separated, and remove it from the body by taking on special tongues (if any) or side faces, trying not to squeeze the plane.
What do you do with the old battery?
Installation of a new battery and assembly of the device
Before installing a new battery, make sure that it is fully consistent with the original. For the Redmi 9, it is usually a model labeled BM50 or similar, depending on the region of delivery. Check the capacity and voltage - they must match the characteristics of the original.
Clean the seat in the case of the residue of old glue and dust. Apply a new double-sided tape or special glue B-7000 thin layer on the frame of the case. Let the glue dry slightly (if the liquid version is used), then carefully set the battery in place.
- 🔋 Make sure the battery is flat and doesn’t hang in the niche.
- 🔌 Connect the battery plume before clicking, controlling the force.
- 🧹 Wipe the insides of the case from dust before closing.
Once the battery is fixed, plug the plume into the motherboard, make sure the connector is in place, then you can put the plastic panel back in place and twist the screws, and be sure to check the phone before you finally stick the back cover.
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The quality of a new battery directly affects battery life.Buy batteries only from trusted suppliers with good reviews.
Checking and calibration
After the device is assembled, you need to do an initial check, turn on the smartphone and make sure that it responds to the pressing of the power button, check whether the correct percentage of charge is displayed and whether the charging process is underway when you connect the cable.
To properly operate the power management system, it is recommended that you calibrate the new battery, completely discharge the phone before turning off, then charge it to 100% when it is off, and then use the device as normal.
If the phone doesn't turn on or shows an error, recheck the connection of the plume. The connector may not be fully latched or oxidized. In rare cases, you may need to reset to the factory settings through the Recovery menu.