Xiaomi Redmi Note 7, released in early 2019, has proven to be a reliable device with excellent autonomy, but over time, even the highest quality lithium polymer battery loses capacity. If your device stops holding charge, turns off in the cold or inflated, the only right solution is to replace the battery. Self-removal of the battery requires accuracy, since the design of the smartphone involves the tight fit of components and the use of adhesives.
In this article, we will discuss in detail the process of how to safely remove the battery from the Xiaomi Redmi Note 7 without damaging the fragile screen or plumes. It is important to understand that the procedure requires specific tools and safety, since work is carried out with a chemical current source. Wrong actions can lead to short circuit or mechanical damage to the motherboard, so carefully study each step before starting work.
Preparation of the workplace and necessary tools
Before you start disassembling the Redmi Note 7, you need to organize a clean and well-lit space. Dust and static electricity are the main enemies of electronics, so it is recommended to use an antistatic mat or just a clean dry surface. You will need a special toolkit that allows you to work with small screws and sticky connections without risking damage to the body.
To successfully complete the battery recovery task, you will need the following tools:
- 🔧 Set of screwdrivers (cross-haired) PH000 and flat) for screw dismantling.
- 💨 A hair dryer or thermophen to heat the adhesive base of the back cover.
- 📱 Plastic mediators or shoulder blades for neat opening of the body.
- 🧲 Magnetic substrate or container for sorting screws so as not to lose them.
Special attention should be paid to the heating source. A normal household hair dryer may not give enough temperature to soften the glue, so it is better to use a temperature-adjusted building hair dryer or a special heating pad. Overheating the screen is unacceptable, since the matrix can leak or go yellow spots, so only warm the back panel.
☑️ Checking readiness for repair
Rear cover removal and protection against statics
The first step will be the removal of the rear glass panel, which is in the model Redmi Note. 7 It's glued around the perimeter. Start by removing the tray for the perimeter. SIM-So you don't damage it if you move carelessly, then turn on the hair dryer and warm up the perimeter of the back cover evenly during the course of the trip. 2-3 minutes, constantly moving the stream of air to avoid local overheating of the glass.
⚠️ Warning: Do not heat the center back, where the camera and the main components are located, focus strictly on the edges of the device. Excessive heating can damage the adhesive layer under the display or damage the matrix.
After warming up, insert the plastic mediator into the top corner between the frame and the glass. Move slowly, cutting through the adhesive layer around the perimeter, trying not to go too deep with the blade so as not to touch the plumes going to the side buttons. Once the lid starts to move away, lift it, but don't move far, as it can be glued to the fingerprint scanner (in some modifications) or just be very close to the boards.
Once you remove the lid, you'll see a metal shield covering the motherboard and connectors, which is mounted with several screws that you need to unscrew. Before you touch the internal components with your hands, touch the grounded metal object to remove static electricity from the body, which can disable the sensitive electronics of the smartphone.
Disabling plumes and removing protective screens
Inside the case of the Xiaomi Redmi Note 7, the battery is closed with a massive metal plate, which also serves as a radiator and protection. To access the battery connector, you need to unscrew all the screws that fix this plate. Note that the screws can be of different lengths, so it is extremely important to remember or record their location.
Once you remove the plate, you'll have access to the connectors, and the first thing you need to do is turn off the battery plume, use a plastic blade or nail, gently pulling the connector up from the bottom, and do not use metal tools to turn off the plumes, as this can short circuit the board.
Then you have to turn off the other plumes if they interfere with access, such as the display plume or the main train board, so that you can freely retrieve the battery without straining the connections. At this stage, it is important to be extremely careful, since the plumes are very thin and easily break when you carelessly handle.
Why is it important to turn off the battery first?
Removal of the battery from the body
The hardest part is the actual extraction of the battery. In the Redmi Note 7, the battery is glued to a frame on double-sided tape, and over time, the glue becomes very strong. Trying to just pull the battery by the tongue or edge can lead to its deformation or, worse, to a breakdown, which can cause fire.
For safe extraction, use the heating and slip method. Warm up the battery area with a hairdryer lightly (not much so as not to damage other components) to soften the glue. Then take a thin line, dental floss or a special plastic card and walk neatly between the battery and the frame, cutting the adhesive layer.
Below is a table with the main steps and risks of extraction:
| Work segment | Action required | Possible risk |
|---|---|---|
| Softening glue | Heating with a hairdryer to 60-70°C | Deformation of the frame or screen during overheating |
| Battery separation | Use of fishing line or map | Puncture of the battery body with a sharp object |
| Element lift | Use of suction or tweezers | Battery bending leading to internal circuit |
If you feel like the battery is not giving in, don't use force. Add a little more heat and keep cutting the glue carefully. The rule is not to bend the battery or pierce it. The lithium polymer inside is very sensitive to mechanical damage.
Cleaning the seat and installing a new battery
Once the old battery is removed, you need to prepare the seat for the new part. There's leftovers from the old glue on the frame that need to be carefully removed. Use isopropyl alcohol and a plastic card or soft rag to clean the surface to a perfectly smooth state.
A new layer of glue should be applied to a new battery or cleaned frame, ideal for this, special adhesive bands B-7000 or ready-made adhesive bases cut into the shape of the battery. Spread the adhesive evenly, avoiding contact and the center of the battery to ensure a tight fit.
⚠️ Warning: Do not use superglue (cyanacrylate) to lock the battery.It releases fumes that can damage the camera and screen, and also makes future replacements almost impossible without damage.
Put the new battery in the case, press it gently across the area to grab the glue, connect the battery plume to the motherboard before a characteristic click, making sure it's up straight, and then you can check the device's performance by connecting the charger.
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Use isopropyl alcohol to remove glue residues – it evaporates quickly and does not conduct electricity, unlike water or solvents.
Device assembly and initial calibration
The final step is to build the Xiaomi Redmi Note 7. Place the metal protective plate and twist all the screws in the correct order. Make sure that no plume is clamped or displaced. Then apply a new layer of glue around the perimeter of the back cover or use a pre-made adhesive frame to seal the case.
Press the back cover and hold the device with rubber bands or a load for 15-20 minutes to polymerize the glue. After assembly, turn on the smartphone. The system can boot longer than usual, as the primary calibration of the power controller occurs, it is recommended to completely discharge the device before turning off and then charge to 100% without interruptions.
When you're in use, monitor your heating temperature and discharge rate, and if the device is stable, the replacement has been successful, and if the battery is installed correctly, it will restore your smartphone's original autonomy and performance.
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High-quality cleaning of the frame from old glue and the use of the correct adhesive guarantee moisture protection and a long life of the new battery.