Xiaomi Redmi Note 8 Pro is one of the most popular smartphones 2019 Even with a reliable battery capacity. 4500 m.h. 3-4 When you're in heavy use, it starts to sit down in half a day. 20-30% If you're charging, if you're inflated, or if you're running your battery in half, it's time to replace the battery. In this article, we're going to talk about how to do it yourself, without going to the service center, and save money. 1500-3000 ruble.
The process of replacing the battery with the Redmi Note 8 Pro is more difficult than on newer Xiaomi models (such as the Note 10 or Note 11), due to the adhesive battery attachment and the fragile plume of the display. However, with the right approach and the availability of tools, even a beginner can cope with the task.
In the article you will find:
- 🔧 List of necessary tools (including alternatives to expensive equipment)
- ⚠️ Critical moments where you can break your smartphone (and how to avoid it)
- 📸 Step-by-step photos of the disassembly with comments
- 🔋 How to choose a high-quality battery and not run into a fake
- ⚡ Post-replacement testing: calibration, charge controller check
1.Preparation: tools and safety
Before you start disassembling, make sure you have everything you need, and using the wrong tools (like a knife instead of a mediator) causes 80% of the time the plume of the display or body to damage.
Here is a complete list of what you will need:
- 🔨 Plastic mediators (2-3 pc.) - for careful smacking of the body and disconnection of the battery
- 🔧 Cross screwdriver PH00 (magnetic) for the screws of the shell
- 🔥 Hair dryer or thermo-air station - for softening the glue (temperature) 60-80°C)
- 🧲 Suction - to raise the display (can be replaced with wide tape)
- 🔋 New battery – original or high-quality analogue (more about this in the next section)
- 🧴 Isopropyl alcohol 90%+ — glue-residue
- 📏 Plastic blade - to disconnect plumes
If you don’t have a thermophen, you can use a regular hair dryer, but keep it at a distance. 10-15 The alternative to the mediators is a guitar transmitter or a plastic card, but they are less convenient.
⚠️ Warning: Do not use metal tools to tamper with the battery! Even a small circuit of the contacts can disable the power controller, and the smartphone will stop turning on.
Also prepare the workplace:
- 🪑 Work at a table with good lighting.
- 📱 Place your smartphone on a soft surface (such as a towel) to avoid scratching the glass.
- 🔌 Turn off your smartphone and remove it. SIM-card with memory card (if any).
2 How to choose a battery for the Redmi Note 8 Pro
Battery quality is not only the life of the battery, but also the safety of the smartphone. Cheap fakes can swell in a month or cause overheating. 8 Pros have articulation MB-J31 and capacity 4500 mAh (voltage) 3.85V). But the originals are expensive (2000-2500 rupees, and on sale often there are counterfeits.
Alternative – quality analogues from proven brands:
- 🔋 ZOP Power is a reliable Chinese manufacturer, batteries pass quality control.
- 🔋 CAMELION — European brand warranty of 12 months.
- 🔋 BASEUS — budget option with good reviews (but check the production date!).
When buying, pay attention to:
| Parameter | What should be. | Signs of forgery |
|---|---|---|
| Capacity | 4500 mAh (±5%) | Overstated (5000)+ mAh) or understated (4000 mAh) |
| Tension. | 3.85V | 3.7V or 4.2V |
| Date of production | Not older than 6 months | No marking or date of erasure |
| Contacts | Clean, no oxidation | Spots, scratches, uneven rationing |
Check the seller reviews before you buy. On AliExpress, look for stores with a rating of at least 98% and order counts. >1000. to the Yandex Market or OZON Look at the photos of real customers – often there are defects.
⚠️ Warning: If the battery is swelling (the body of the smartphone is "unplugged"), do not try to pierce or bend it! This can lead to fire. Carefully remove the battery and dispose of it at a special reception point.
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Before installing a new battery, take a photo of the old one from both sides - this will help to connect the plumes correctly and not confuse polarity.
3. Step-by-step disassembly of Xiaomi Redmi Note 8 Pro
Now we're going to the most important stage. Don't rush, it's better to spend on the dismantling. 30-40 minutes than to break the plume for 5 minute.
Step 1: Removing the back cover
- Heat the edge of the back cover with a hair dryer (around the perimeter) during 2-3 The glue will get softer.
- Insert a plastic mediator into the gap between the case and the cover (start at the bottom edge where the charging connector is).
- Carefully drive the mediator along the body, putting the lid on, and if you feel resistance, warm up the place again with a hairdryer.
Step 2: Spinning the screws
- 🔧 When you take the lid off, you'll see 15 screws of different lengths, and if you remember or take a picture of them, if you confuse them, you can damage the motherboard!
- The screws near the camera and the charging connector are usually shorter than the others.
Step 3: Disconnecting the plumes
- 📱 Carefully put a plastic blade battery plume (it is under a black insulation tape).
- Disconnect the display plumes, cameras and touch buttons (they are fixed with latches - lift them up).
Step 4: Remove the old battery
- 🔥 Warm up the battery with a hairdryer (temperature) again 70-80°C) during 3-5 The glue under the battery will become elastic.
- Put a plastic blade on the battery from any end, and slowly pull it up. If the glue doesn't lend itself, put the isopropyl alcohol under the battery and wait. 1-2 minute.
- Don't use force! If the battery doesn't come out, heat it longer or add alcohol.
Is the smartphone off the power supply?|Is the back cover removed?|Are all screws unscrewed?|Is the battery plume disconnected?|Is the new battery ready?-->
4. Installation of a new battery and assembly
When the old battery is removed, clean the seat of glue residue with isopropyl alcohol. Make sure there is no dust or debris on the board.
Step 1: Preparing a new battery
- 🔋 Compare the new battery to the old one – contacts should match in location and quantity.
- If there is a protective film on the new battery, remove it.
- Stick bilateral tape (comes complete) or apply a thin layer of glue B-7000 edgewise.
Step 2: Connection
- Carefully connect the new battery plume to the circuit board connector, make sure the contacts match.
- Press the battery to the body and make sure that it lay flat, without distortions.
Step 3: Reverse assembly
- 🔧 Keep all the stains in place (and keep them in place!).
- Connect the display plumes, cameras and buttons.
- Install the back cover and warm it up with a hair dryer (60).°C) for better adhesion.
⚠️ Warning: If the smartphone doesn't turn on after assembly, check: Is the battery plume properly connected (sometimes it "steps away" when assembly); Is the circuit board closed (look for foreign objects); Are the screws mixed up (long screws can break through the board!).
What if the smartphone does not turn on after replacing the battery?
5. Battery calibration and testing
Once the battery is replaced, it needs to be calibrated so that the charge controller correctly displays the percentage of charge, and without calibration, the smartphone can show 100% charge, and after an hour suddenly turn off.
Calibration instructions:
- Charge your smartphone to 100% (use the original RAM).
- Turn off the charging and discharge the phone until it automatically shuts down.
- Connect charging and charge up to 100% without interrupting the process (even if the phone already shows 100%, keep it charging for another 1-2 hours).
- Repeat the discharge / charge cycle 2-3 times.
To check the real capacity of the battery, use the applications:
- 📊 AccuBattery – shows battery wear and real capacity.
- 📉 CPU-Z — displays the voltage and temperature of the battery.
- 🔋 AIDA64 — Detailed information about the charge controller.
If after calibration the smartphone still discharges quickly, there are two possible reasons:
- Battery defective (check the voltage with a multimeter - it should be) ~3.85V 50% charge).
- Problems with the power controller on the board (diagnosis is required in the service).
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Calibration of the battery is mandatory! Without it, the new battery can last 2 times less due to improper display of the charge level.
6. Frequent mistakes and how to avoid them
Even experienced technicians sometimes make mistakes when replacing batteries, and here are the most common ones and ways to prevent them:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Close contacts, failure of the power controller | Work only with plastic or wooden mediators |
| Battery overheating with a hairdryer | Bloating or ignition of a lithium-ion battery | Keep the hair dryer at a distance of 10-15 cm, the temperature is not higher than 80 ° C |
| Tangled screws | Motherboard failure, camera damage | Take a picture of the location of the screws before unscrewing |
| Strong pressing on the display during assembly | Damage. OLED-matrixes (the appearance of broken pixels) | Press the cover evenly, without distortions |
Another common problem is that the smartphone doesn't see the new battery, and it can be because of:
- 🔌 Bad contact plume - check if it sits tightly in the connector.
- 🔋 Incompatible battery – some cheap analogues have a different setup.
- 📱 Power controller failure – try resetting to factory settings (Settings) → Additionally. → Recovery and discharge).
If the battery warms up more than usual after replacement, this may be a sign:
- 🔥 Poor battery (check out the model reviews).
- 🔌 Charger issues (use Xiaomi’s original RAM on the 18W).
- 📱 Background processes (check in Settings) → Battery → Battery utilization).
7. Alternative methods: replacement without disassembly
If you are unsure of your abilities or are afraid of damaging your smartphone, there are two options:
1. Contact the service center
- ✅ Pros: Work guarantee (usually) 3-6 months), professional equipment.
- ❌ Cons: cost 1500-3000 RUB, the risk of running into unscrupulous masters.
Average prices in services (2026):
- 📍 Moscow/SPB: 1800-2500 roubles (battery).
- 📍 Regions: 1200-1800 RUB (excluding battery).
2. Replacement through Xiaomi's branded service
- ✅ Pros: original parts, warranty 1 year.
- ❌ Cons: high cost (3000-4000 rupees), long period of repair (7-14 days).
Before you give the smartphone for repair, check:
- 🔍 Reviews about the service (on Yandex Maps or 2GIS).
- 📄 Availability of a warranty card (oral promises are not considered!).
- 🔧 What battery will be installed (require the original or certified analogue).
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If you decide to give your smartphone to the service, take a picture IMEI (It's on a box or in *#06# and the battery serial number, which will help prove that you got the wrong part if something goes wrong.