The Xiaomi Redmi Note 8 Pro is one of the most popular mid-range smartphones, but even it has battery problems over time. If the phone starts to run out quickly, suddenly turn off or swell, you may need to replace the battery. However, improper battery removal can damage the plumes, break contacts or even fire. In this article, a step-by-step instruction with nuances that are not found in standard manuals.
It's important to understand that the Redmi Note 8 Pro has a built-in 4,500 mAh lithium polymer battery soldered to the motherboard, which means that replacing it will require not only accuracy, but also special tools, from plastic blades to a dryer to soften the adhesive, and we'll break it down so that even a beginner can handle it without fatal errors.
We warn you right away: if you've never disassembled a smartphone, you'd better go to a service center, but if you decide to act on your own, follow our recommendations to avoid short circuits when you disconnect the battery or damage the flexible plumes of the screen.
Preparation: security tools and measures
Before you start disassembling, make sure you have everything you need, and without the right tools, you risk damaging the body or the internal components, and here's the minimum kit you'll need:
- 🔧 Set of screwdrivers (cross-haul) PH00 and a flat 1.5 mm for Xiaomi screws)
- 🔥 Technical dryer (or construction with temperature adjustment up to 80-100)°C)
- 📱 Plastic blades/mediators (to separate the back cover and the battery)
- 🧲 Suction (helps to suction the cover after heating the glue)
- 🔌 Tweezers (for working with small plumes and contacts)
- 🛡️ Gloves and safety glasses (the battery may leak or ignite)
Also, prepare your workspace: a clean desk with good lighting, no carpets or puffy surfaces (small screws are easily lost), it is advisable to use an antistatic mat or at least touch a grounded metal object before starting work, this will save the fee from static discharge.
⚠️ Warning: Do not use metal tools to separate the battery! Even a small circuit of the contacts can lead to fire or explosion of the battery.
If you don’t have a hair dryer, you can try softening the adhesive with isopropyl alcohol (90% and higher), but it’s less effective and takes longer.The alternative is a special battery glue (such as the B-7000) that you’ll need to install a new battery.
Step 1: Turn off and disassemble the Redmi Note 8 Pro case
The first step is to completely shut down the power, and even if the phone is dead, it can get power from USB or wireless charging, which is dangerous when you're running a battery.
- Press the power button and select Turn it off.
- Wait for the screen to be completely turned off (at least 30 seconds).
- Extract. SIM-card and memory card (if installed) so as not to damage the slots.
Now you can start disassembling. On the Redmi Note 8 Pro, the back cover is attached to the glue and the latches.
- Heat the edges of the body with a hair dryer (80-90 ° C, no higher!) for 2-3 minutes. Move the hair dryer around the perimeter so that the glue softens evenly.
- Suction the lid on the charging connector (there is less glue there). If there is no suction cup, use a plastic spatula.
- Carefully drive the blade along the body, snapping the clamps. Do not force - if the lid does not respond, warm up again.
When you take the lid off, you'll see a battery pack with a black protective film, a motherboard and plumes. Don't touch the board with your bare hands, because sweat and fat can cause contacts to corrosion.
Phone is off and off-charging.|SIM-MicroSD and card retrieved|The body will be warmed by a hairdryer around the perimeter.|Tools at hand (scapula, tweezers, screwdrivers)|The workplace is clean and lit.-->
Step 2: Disconnect the plumes and batteries
Before you touch the battery, you need to disconnect all the plumes that go to the motherboard. On the Redmi Note 8 Pro there are three:
- 📞 Display plume (the widest, at the top of the board)
- 🔋 Battery plume (thin, with red/black wire)
- 🎵 Power and sound button plume (small, right)
Use a plastic blade or tweezers to gently lift the latches of the connectors. Don't pull the wires, they can come off! Start with the battery plume to completely de-energize the device.
| schleife | Location. | Risk of damage |
|---|---|---|
| Battery | Lower part of the board, red/black wire | Short circuit, fire. |
| display | Upper, wide connector. | Broken pixel, non-functioning screen |
| Button | Right side, small connector. | Non-functioning volume/power buttons |
Once the plumes are turned off, you can start removing the battery, and it's attached to a double-sided glue that needs to be softened.
- Warm up the battery with a hair dryer (temperature not higher than 60 ° C!) for 1-2 minutes.
- Put a plastic blade on the battery from any angle, and if the glue doesn't work, warm it up again.
- Slowly drive the blade under the battery, separating it from the body. Take your time - ragged movements can break contacts!
⚠️ Attention: If the battery is swelling (body cover is raised), do not warm it up with a hair dryer! The risk of ignition is extremely high.
What to do if the battery is too tight?
Step 3: Removing the battery and checking contacts
When the battery is separated from the glue, it can be removed. Hold it by the edges without touching the contacts (especially if they are bare).
- 🔍 Bloating (if the battery case is deformed, it cannot be used!)
- 💧 Electrolyte darts (white or green plaque on contacts)
- ⚡ Oxidation (dark spots on copper tracks)
If the contacts on the motherboard are contaminated, clean them with a cotton swab with isopropyl alcohol. Do not use acetone or other aggressive solvents - they will damage the board!
Also check the integrity of the flexible plumes. If they are torn or torn, they will have to be replaced. For the Redmi Note 8 Pro, the plume of the display with a touchscreen costs about 500-800 rubles, the plume of the buttons - 200-300 rubles.
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If you plan to sell the phone after a battery change, take a picture of the old battery with the date of production (printed on the sticker) that will confirm that the replacement has been carried out and increase the buyer's confidence.
Step 4: Installation of a new battery
Before installing a new battery, make sure it is compatible with the Redmi Note 8 Pro. The original battery is labeled BM47 or BM48 and has a capacity of 4500 mAh. Counterfeiting often has a smaller capacity (3500-4000 mAh) and fails faster.
Installation process:
- Apply a thin layer of B-7000 glue to the back of the battery or the phone body.
- Carefully install the battery in place, combining contacts with the connector on the board.
- Press the battery for 1-2 minutes to get the glue.
- Connect the battery plume to the motherboard (click the connector until a characteristic click).
Don't turn the phone on right away! First, plug in the display plume and the buttons, then make sure all contacts are securely locked, and then you can start assembling the case.
Step 5: Build your phone and check its health
The assembly takes place in reverse order:
- Set the back cover in place, combining the latches.
- Warm up the edges with a hair dryer (60-70 ° C) and press the lid for 1-2 minutes for reliable fixation of the glue.
- Put it in. SIM-card and memory card (if used).
- Connect the charger and wait for the charging indicator to appear.
If the phone is not switched on:
- 🔌 Check if the battery is connected.
- 📵 Make sure the battery contacts are not closed (use the multimeter in resistance mode).
- 🔄 Try to press the power button for 10-15 seconds to reset.
After successful inclusion, check:
- 🔋 Charging (the phone must recognize the charger).
- 📱 Touchscreen (are there any "dead zones").
- 🔊 Volume and power buttons (they should work without delay).
⚠️ Warning: If the phone starts to warm up or discharge quickly after replacing the battery, turn it off immediately! this may indicate a malfunction of the new battery or a short circuit on the board.
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After the battery is replaced, it is recommended to calibrate the battery: completely discharge the phone, then charge to 100% without interruption, which will help the power controller to determine the level of charge more accurately.
Frequent Mistakes and How to Avoid Them
Even experienced tycoons sometimes make mistakes when replacing a battery, and here are the most common ones and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools to separate the battery | Short circuit, fire. | Use only plastic blades |
| Battery overheating with a hairdryer (>100°C) | Bloating or ignition of the battery | Keep the temperature below 80°C |
| Strong pressure on plumes when disconnected | Contact break, broken screen | Only slack the connectors from the edges. |
| Installation of a non-original battery | Rapid degradation, low capacity | Buy batteries labeled BM47/BM48 |
Another common problem is that the phone doesn't turn on after assembly, and most of the time, it's related to:
- 🔌 Unconnected battery plume (check the connector on the board).
- 📵 Closed contacts (use a multimeter to check).
- 🔄 Resetting settings BIOS (Sometimes you need to re-watch the phone).
If you're facing one of these problems, don't panic. 90 percent of the time, you can solve it without a service center, for example, a cliff on a display plume is often disguised as a "battery malfunction" -- the phone may vibrate when charging, but the screen will remain black.