Xiaomi’s Redmi series has long proven to be reliable, with great autonomy. However, any lithium-ion power source has the ability to degrade over time, losing capacity and losing charge during a working day. If your Xiaomi Redmi 8 is a few years old, you may have noticed that it started to discharge faster or shut down at 20-30% charge.
In this situation, the owner has a choice: to carry the gadget to the service center or try to replace the battery yourself. Self-repair requires accuracy, a minimum set of tools and understanding of the design of the device. In this article, we will discuss in detail the process of dismantling the old and installing a new battery, paying special attention to the nuances of disassembling the Redmi 8 case.
It should be noted that the design of modern smartphones does not involve easy replacement of the battery by the user, the body is glued together with a special composition, and the internal components are tightly arranged. Careless actions can damage the plumes or the screen itself, so carefully follow each step of the instructions and take your time.
Preparation of the workplace and necessary tools
Before you start dismantling the Xiaomi Redmi 8, you need to organize a safe and comfortable workspace. You will need a table with good lighting to distinguish between small screws and connectors. The absence of dust and foreign objects minimizes the risk of losing parts or getting debris inside the device.
To successfully perform the replacement procedure, you will need a specific set of tools. Using inappropriate items such as kitchen knives or thick screwdrivers can irrevocably damage the body or matrix of the display. Plastic mediators and thin metal blades are your main assistants in this process.
- 🔧 Set of screwdrivers (mandatory presence of cross-haired) PH000 flat).
- 📱 Plastic blade or mediator for opening the body.
- 🌡️ Hair dryer or heating platform (to soften glue).
- 🧪 Isopropyl alcohol and sucker (optional, to facilitate the removal of the lid).
⚠️ Warning: Before starting work, be sure to turn off the smartphone. Attempting to disassemble the on device can lead to a short circuit and failure of the power controller.
It is also recommended to prepare a screw folding container, as they can differ in length and thread. By confusing them when assembled, you can damage the thread in the plastic pillars of the case or punch the motherboard with a too long screw.
☑️ Checklist for repair preparations
Removal of the back cover and removal of the protective panel
The process of opening the Xiaomi Redmi 8 begins with heating the perimeter of the back cover. The adhesive composition that locks glass or plastic to the frame becomes elastic when heated. Use a dryer at medium temperature, evenly warming the edges for 2-3 minutes. Don't hold the hair dryer too close to overheat the matrix or battery.
After warming up, insert a plastic spatula or suction cup into one of the corners, usually starting at the bottom or top. Carefully, without any sudden jerks, drive the tool along the perimeter, gradually peeling off the lid. Don't try to fit the lid in the center, there are internal elements that can be damaged.
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If the lid is difficult to remove, do not use force. Warm up the problem area with a hair dryer once again, the glue should be removed easily.
When you successfully remove the back panel, you'll see a black plastic pad covering the bulk of the insides, and it's attached to 10 screws around the perimeter, twist them all out, and gently remove the pad by pulling it up, and underneath it you'll have access to the motherboard, the camera module, and the battery.
Disconnecting plumes and preparing for battery recovery
When you take off the safety panel, the first thing you do is to turn off the battery by disconnecting the battery plume from the motherboard, which is a critical step in ensuring that you can keep it safe, and the plume is on top of the smartphone and it's covered with a metal plate.
Carefully unscrew the screws that hold the metal screen of the connectors. Remove the plate and use a plastic blade to snap the battery connector. The movement should be directed strictly upwards so as not to break the connector itself on the board.
- 🔌 Click the connector of the main battery plume.
- 📸 Turn off the main and front camera plume (if they interfere with access).
- 📶 If necessary, remove the antenna module if it blocks access to the battery glue.
In some versions of the Redmi 8, the lower battery screws can be blocked by other components. Carefully inspect the layout. If you see screws pressing the bottom of the battery or protective film, they must be twisted out. Ignoring the fasteners will cause the battery to rupture when removed.
⚠️ Warning: Never use metal tools (tweezers, needles) to disable plumes.The metal can close contacts on the board, causing permanent damage to electronics.
Removal of the old battery from the body
The battery in Xiaomi Redmi 8, like most modern smartphones, is glued to the internal frame with double-sided tape. The clutch is quite strong, so simply pulling the tongue (if any) is often not enough. Moreover, sharp twitching can lead to deformation of the battery housing, which is strictly forbidden.
To safely extract, use a hairdryer again. Heat the area around the battery on the outside of the case (through the front glass, it is risky to do this, it is better to warm through the back cover if it is already removed, or gently around the perimeter inside).
What to do if the battery is not removed?
Use a suction cup, attach it to the center of the battery, and pull it up while gently putting the edges on with a plastic blade. Move around the perimeter, gradually releasing the glue. If you feel strong resistance, stop and add a little more heat. The integrity of the lithium-ion cell shell cannot be broken, it can lead to fire.
In older devices, the glue could dry and become very hard, and then the isopropyl alcohol will help, and if you drop a few drops around the battery perimeter, wait a few minutes, the liquid will penetrate the glue layer and weaken its grip on the frame.
Installation of a new power supply and assembly
Before installing a new battery, you need to prepare a seat. Carefully remove the residue of old glue and tape from the frame of your smartphone. The surface should be clean, low-fat and dry. A cotton swab dipped in alcohol is ideal for cleaning.
The new battery for the Redmi 8 often comes with an already applied adhesive layer.If there is no adhesive, use a special double-sided electronics tape or B-7000 liquid glue. Apply the adhesive in a thin layer, avoiding contact and connector.
| Parameter | Description of action | Importance |
|---|---|---|
| Cleanup | Removal of old glue with alcohol | Tall. |
| Fixation | Applying new glue/scotch | Critical |
| Connection | Tight docking of the connector | Critical |
| Verification | Including test before assembly | Tall. |
Carefully put the battery in the designated compartment, making sure it's flat and not bulging. Connect the plume to the motherboard before the characteristic click. Make sure the connector is flat and fixed. Now you can do a primary health check without fully assembling the case.
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The basic rule of assembly is to check the device first, and then apply the glue to the back cover, which will save time if you find a defect.
Final inspection and calibration of the battery
Once you've successfully connected, press the power button. If the screen catches fire and the MI logo appears, it's a success. Let the phone charge to 100% when the screen is off or off, and it helps the power controller correctly determine the capacity of the new element.
Complete assembly is done in reverse order: a protective panel is installed, 10 screws are twisted, then the back cover is glued and pressed. For reliable fixation of the lid, it is recommended to use new adhesive strips or high-quality glue, pressing the edges of the smartphone with rubber bands for 15-20 minutes.
After assembly, it is advisable to conduct a calibration cycle: discharge the phone before turning off (0%), then charge to 100% continuously. This will help the Android system and MIUI firmware correctly display the percentage of charge. The first couple of charge-discharge cycles can be unstable, this is normal for a new battery.
- 🔋 Discharge the device until completely switched off.
- ⚡ Charge to 100% without interruptions.
- 🔄 Repeat the procedure. 1-2 time-calibration.
⚠️ Warning: If the phone is warming in the battery area while charging or operating, stop using immediately.This may indicate a defect in the new battery or improper connection.