Owners of the popular Xiaomi Redmi 8 budget model often face natural wear and tear of the battery, which eventually begins to hold the charge or swell. Self-replacement of the battery is a complex but feasible process, requiring accuracy, special tools and understanding the internal device of the smartphone. Unlike older phones with removable covers, here the battery is closed with a glass back panel on glue, which greatly complicates the task.
Before disassembling, you need to understand the risks: inept actions can damage the display, plumes or even fire a damaged battery. This article details how to safely remove the battery from the Redmi 8, what nuances of the adhesive base to consider and how not to damage the fragile components of the board during dismantling.
Not only will you need a new battery to work, but you will also need a quality set of tools, including suction cups, mediators and, preferably, a thermophene or a glue softening heating pad. Ignoring safety rules when working with lithium polymer power supplies can be dangerous, so carefully study each step of the instructions.
Preparation of the workplace and necessary tools
Quality repairs begin with the right organization of space. The work surface must be clean, flat and well-lit so that small screws and parts do not get lost. It is crucial to use an antistatic mat or at least clean fabric, as static electricity can damage Xiaomi's sensitive electronics.
You'll need a special toolkit, which is often marketed as a "smartphone repair kit." Without a quality magnetic-tipped screwdriver and a thin metal or plastic scalpel, it can take a long time. Pay special attention to the condition of the blades - they should be sharp, but not have dents that could scratch the internal components.
- 🔧 A set of precision screwdrivers (mandatory presence of bits) PH00 and PH000).
- 🔥 Heat source: professional thermophene, household hair brush or electric heating pad.
- 📱 Plastic blades (mediators) and a suction cup for neat opening of the body.
- 🧴 Isopropyl alcohol (concentration of at least 90%) or special solvent of adhesive B-7000.
⚠️ Warning: Never use an open fire (lighters, candles) to heat the back cover. Local overheating can cause the battery to explode or permanent damage to the display on the back.
Prepare a magnetic bottom tank or use a piece of paper with a drawn circuit where you'll lay the screws in order of extraction. Redmi 8 uses screws of different lengths, and putting a long screw into the hole for a short one can break through the motherboard, which would be a fatal mistake.
☑️ Checking readiness for repair
Primary disassembly: removal of the back cover and protective panels
The process begins with the device shutdown and retrieval. SIM-Then you need to carefully warm the perimeter of the back cover. 8, When heated, it becomes elastic, allowing the glass to be separated from the frame without chipping. 80-90 degrees Celsius.
After heating, insert the suction cup into the bottom of the back panel, pull up slightly to create a gap, and enter a thin mediator. Move the tool along the perimeter, trying not to plunge deeper than 3-4 mm, so as not to damage the tail of the side button or camera module. The glass of the back cover is very fragile and requires delicate handling.
When the lid is removed, you'll see a plastic panel covering the main board and the top of the battery, which is mounted on several screws and plastic latches. Unscrew all the visible screws, which can vary depending on the board revision, but there's usually about 6-8 of them.
Nuances glue in Redmi 8
When you remove the plastic lining, you get access to the top of the battery and the connectors, and it's important to not put too much effort into this, because there are thin antenna wires underneath the plastic, and carefully bend them aside, freeing up access to the board's mounting screws.
Disconnection of plumes and dismantling of the motherboard
In most cases, to get full battery access, you need to remove the motherboard, because the battery in Redmi 8 is attached to it and partially covered. The first step is always to disconnect the battery plume from the board. This is a critical safety issue.
Use a plastic blade to turn off the connector. Metal tools are best avoided so as not to accidentally close contacts on the board. After the power is turned off, you can safely disconnect the remaining plumes: the display, the main and front cameras, and the bottom charging plume.
- 🔌 Turn off the display plume, carefully lifting the connector locking mechanism.
- 📷 Remove the connectors of the camera modules, using caution with the lenses.
- 🔊 Disconnect the plume of the lower module (dynamics and microphone).
Once you've shut down all communications, unscrew the motherboard-holding screws, which can be anywhere from 4 to 6 pieces, and the board sits tight, so you need to pull it out, swaying slightly from side to side, but without jerking, and make sure that the speaker is not caught in the frame.
⚠️ Warning: Before removing the board, make sure the vibro motor is turned off if its wire passes under the board.Sharp movement can break the thin power wires of the vibro motor, the restoration of which requires soldering.
Put the board in a safe place, preferably a screen down on the soft fabric, so as not to scratch the camera, and now you have access to a battery that occupies almost the entire inner niche of the case.
Removal of the battery: technologies and methods of glue removal
The battery in Xiaomi Redmi 8 is mounted on a powerful layer of glue throughout the contact area with the frame. Just pulling the tongue (if any) or picking the battery with a screwdriver is a direct path to damage and possible ignition. Heating here again becomes your main tool.
There are several effective ways to separate the battery, and the safest way is to use a map or a thin line, and the line is taken over the edge of the battery and cuts through the glue layer in a sawing motion, which requires skill, but minimizes the risk of deformation of the battery.
If you use heating, warm up the area around the battery for 3-5 minutes. The glue should become soft. Then, using a plastic card, gently tuck the battery, starting at the bottom edge. Don't bend the battery or prick it with sharp objects.
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To facilitate the removal of the battery, drop a few drops of isopropyl alcohol under the edge of the battery and wait 2-3 minutes. The liquid will penetrate the adhesive layer and significantly weaken the adhesion.
In some cases, manufacturers leave special pulling tapes (pull-tabs) under the battery. In Redmi 8, they may not be there, or they may be cropped during previous repairs. If you see black strips with numbers, try slowly pulling them parallel to the plane of the battery.
Comparison of battery recovery methods
The choice of method depends on your skills and the tools available, each method has its advantages and risks, and below is a table to help you choose the best strategy for your situation.
| Method | Difficulty | Risk of damage | Equipment required |
|---|---|---|---|
| Heating and plastic map | Medium | Medium (can bend the battery) | Fen, mediators. |
| line or string | Tall. | Low (if done carefully) | Line 0.3-0.5 mm, gloves |
| Chemical solvent | Low. | High (risk of getting on board) | Alcohol, syringe, suction cup. |
| Vacuum suction cup + heating | Low. | Low. | Suction, hair dryer |
The most recommended method for beginners is a combination of moderate heating and careful plastic card operation. Chemical methods require extreme caution, since alcohol can damage the oleophobic coating of the display on the back side or oxidize the contacts if it gets there.
Remember that lithium polymer batteries should not be punctured or severely deformed, as this leads to an instant short circuit and thermal reaction. If the battery starts to warm or smoke, immediately place it in a non-combustible container.
Installation of a new battery and assembly of the device
After successfully removing the old battery, you need to thoroughly clean the seat of the residue of the old glue. Use isopropyl alcohol and a plastic shoulder blade. The surface must be perfectly smooth and fat-free so that the new battery will lie flat and secure.
The new Xiaomi BM47 battery (or similar) needs to be re-adhesive, you can use special double-sided phone tapes or B-7000 liquid glue, and you can apply a thin layer of glue around the perimeter and in the center, avoiding contact and electronics.
- 🧹 Carefully degrease the frame of the body with an alcohol napkin.
- 🔋 Install a new battery, pressing it tightly throughout the area.
- 🔌 Connect the battery plume to the board before installing the board in place.
You do the reverse assembly. You set the motherboard, make sure all the plugs are in place. You twist the screws, but don't pull them over. You check the phone without sticking the back cover: turn on the device, check the charging, sound, vibration and sensor.
⚠️ Warning: When assembly, make sure that the plumes are not hit by screws or clamped with plastic panels, which can cause the cameras, speakers or the display itself to fail after complete assembly.
If all tests are successful, apply a new layer of glue to the perimeter of the back cover and press it tightly against the body. Lock the device with rubber bands for 1-2 hours until the glue is completely dry, after which your Redmi 8 is ready for active use again.
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Quality cleaning of the seat from old glue is a guarantee that the new battery will not hang and move away from the body when falling.