Xiaomi Redmi Note 8 Pro remains one of the most popular smartphones in the budget segment even after 5 But over time, the battery capacity inevitably declines: the phone runs out in a few hours, turns off when it's released. 20-30% If you're facing these problems, it's time to think about replacing the battery.
In this article, you will find step-by-step instructions for replacing the battery with the Redmi Note 8 Pro (codename begonia), including the choice of a quality battery, the necessary tools and unique nuances of disassembling this model (for example, working with the adhesive layer and the fragile display plume).
Signs that it is time to change the battery
Redmi Note battery 8 Pro is designed for 500 full charge cycles (from 0 before 100%), Then its capacity drops to 80% It's from the baseline. In real life, it's through the 2-3 year of active use, you can determine the wear by the following symptoms:
- 🔋 Phone's running out of power. 3-4 hours with moderate use (social networks, messengers).
- 📉 The percentage of charge “jumps”: for example, from 40% immediately drops to 15% after a reboot.
- ⚡ The smartphone is turned off when 20-30% although it had previously been used before 5-10%.
- 🔥 The battery swelled (seen on a raised display or body).
- 🐢 Charging is extremely slow or interrupted (especially on wireless charging).
If at least 2-3 You know the item on the list -- the battery is worn out, and you can check the exact capacity through an engineering menu or an application like AccuBattery (Android). 3-summer-battery — 20-30%. If the figure is higher 40%, replacement is inevitable.
⚠️ Attention: Bloated battery is dangerous! It can damage the display, motherboard or even ignite. If the case of the smartphone is deformed, do not try to disassemble it yourself, immediately contact the service.
What battery to choose for replacement
The original battery of the Redmi Note 8 Pro is marked BM47 (or DM-BM47) with a capacity of 4500 mAh and a voltage of 3.85 V. When choosing a replacement, pay attention to the:
| Parameter | Original | Quality analogue | Cheap analogue (risk) |
|---|---|---|---|
| Capacity | 4500 mAh | 4300-4500 mAh | 3800-4,000 mAh |
| Tension. | 3.85 In | 3.8–3.85 In | 3.7 B or 4.2 B |
| Marking | BM47 / DM-BM47 | BM47 (Xiaomi-logo) | Unmarked or misprinted |
| Price (2026) | 2500–3500 ₽ | 1200–2000 ₽ | 500–900 ₽ |
The best options to buy:
- 🛒 The original Xiaomi (article) MBY09ZM) — Quality assurance, but high price.
- 🔋 Analogues from Baseus, Remax, Xiaomi Authorized – proven brands with good reviews.
- 📦 Kits with tools (for example, on AliExpress) - it is profitable if you plan to replace yourself.
Avoid unlabeled batteries, with suspiciously low prices, or with a capacity above 4500 mAh (this is a hoax), and make sure that the kit comes with a glue layer for fixing, without which the battery will hang inside the case.
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Check the reviews of the seller on the site before buying, often under the guise of original batteries, they sell counterfeits with a capacity of 3000-3500 mAh.
Required tools for replacement
To disassemble the Redmi Note 8 Pro and replace the battery, you will need:
Suction cup (∅ 5-7 cm)
Plastic mediators (2-3 units) or guitar mediators
Screwdriver kit: cross-haired (PH00), five-pointed (Pentalobe) P2)
Tweezers with curved ends
Dryer or thermo-air station (for softening the glue)
Isopropyl alcohol (90%+) and cotton swabs
New battery with adhesive layer
Double-sided scotch (for fixing plumes)-->
Where to buy tools:
- 🛠️ Smartphone repair kits on AliExpress or in electronics stores (cost 300-800) ₽).
- 🔧 Individual instruments in Leroy Merlin or OBI (e.g. mediators in the stationery department).
- 🔥 The dryer can be replaced with a household one, but adjust the temperature - no higher than 60-70°C, so as not to damage the display.
If you don't have a tool, don't improvise it. For example, trying to remove the display with a knife or a metal screwdriver is almost guaranteed to damage the plume or scratch the body.
⚠️ Attention: Redmi Note 8 Pro has a fragile display plume that is easy to tear when you take the screen carelessly.If you do not have experience, practice on an old smartphone or watch video disassembly before work.
Step-by-step instructions for replacing the battery
The replacement process will take 40-90 minutes depending on the experience.
1.Switching off and preparing the smartphone
Turn off your phone completely. If the battery is bloated and the smartphone doesn't turn off, discharge it to 0% in safe mode (hold the power button for 10 seconds).
- Take it down. SIM-card and memory card (if any).
- Warm up the display edge hair dryer (around the perimeter) for 2-3 minutes at a temperature of 60°C.
- Stick the suction cup to the bottom of the screen (above the Home button).
2. Display removal
Pull the suction cup carefully to separate the display from the body, insert a plastic mediator into the gap and slowly lead it along the edge, separating the adhesive layer. Don't push too hard, there are plumes inside!
Once the display is separated, raise it to 45.° And you can fix it, like on a box, and don't disconnect the plumes completely, just bend the screen, like you see in the photo:
Photo of the correct position of the display when replacing the battery
3. Battery disconnection
Now you need to disconnect the battery from the charge:
- Unscrew 4 screws fixing the metal plate above the battery (cross screwdriver) PH00).
- Carefully tuck the plate with tweezers and remove it.
- Disconnect the battery connector with a plastic mediator (not metal!).
Check the voltage on the contacts of the battery multimeter - it should be 0 V. If it shows 3.7-4.2 V, then the battery is not completely disconnected (the risk of short circuit!).
4. Removal of the old battery
The battery in the Redmi Note 8 Pro is glued to double-sided tape to remove it:
- Put a plastic shoulder blade on the battery from any angle.
- Put a thin plastic card under it (for example, a bank card).
- You can drop isopropyl alcohol under the battery - it will dissolve the glue.
- Slowly keep the card under the battery, separating it from the case.
If the battery is swollen, don't puncture it! It can cause fire. Instead, gently cut the glue off the edge with scissors.
5. Installation of a new battery
Before installing the new battery:
- 🧹 Remove the remains of the glue from the body with alcohol and a napkin.
- 🔄 Check that the new battery has a glue layer (usually it comes with a kit).
- ⚡ Connect the battery connector to the board and fix the metal plate.
Put the battery back in place and press it for 10 to 15 seconds to make the glue stick. Don't turn the phone on right away -- let the glue dry for 5 to 10 minutes.
6. Build a smartphone
Before final assembly:
- Check that all the plumes (display, cameras, speaker) are connected.
- Make sure there is no debris or residue of old glue under the battery.
- Carefully press the display and snap it around the perimeter (start at the top).
Turn on the phone and check:
- 🔋 Charging is normal (without overheating).
- 📱 Sensor works without delay.
- 🔊 The speakers and microphone are not silenced (check by call).
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If the phone doesn't turn on after assembly, check the battery plume and display connection, and 90 percent of the time, the problem is poor connector contact.
Frequent Mistakes and How to Avoid Them
Even with a careful battery replacement, beginners make mistakes that lead to failure.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Using metal tools to remove the display | Scratches on the body, damage to the plume | Use only plastic mediators. |
| Overheating by a hairdryer (>70°C) | Display detachment, glue damage | Keep the hair dryer at a distance of 10 cm, temperature 50-60°C |
| Strong pressure on the bloated battery | Battery rupture, electrolyte leakage | Cut the glue at the edges, do not press on the center |
| Incorrect connection of the battery plume | Short circuit, failure of the power controller | Check the polarity of the connector before connecting |
Another common problem is that the phone doesn't see the new battery.
- 🔌 Bad contact in the connector (check if the pins are bent).
- 📱 Resetting the power controller settings (solved by full discharge/charging).
- 🔋 Refused battery (check the voltage multimeter).
If the battery is discharged too quickly after replacing it, calibrate it: completely discharge the phone, then charge to 100% without interruptions (3-4 cycles).
The cost of replacement in the service vs independently
The price of battery replacement in the Redmi Note 8 Pro varies depending on the region and type of service:
| Replacement option | Cost (2026) | Pluses | Cons |
|---|---|---|---|
| Official Xiaomi service | 3500–5000 ₽ | 6 months warranty, original parts | Long (3-7 days), high price |
| Informal service | 1500–2500 ₽ | Fast (1-2 hours), cheaper | Risk of poor quality spare parts |
| Independently. | 800–2000 ₽ | Minimum costs, experience of repair | Risk of damage to the phone |
A self-substitution is beneficial if:
- 💰 You have a limited budget (savings up to 70%).
- 🛠️ There is experience in disassembling equipment (for example, cleaned the laptop from dust).
- ⏳ No time to wait for repairs in the service.
Please contact the service if:
- 🔧 No tools or skills.
- 🔥 Battery swollen or damaged.
- 📱 Phone warranty (self-repair cancels it).
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If you’ve never taken a smartphone apart, work out on an unnecessary device or watch 2-3 Redmi Note 8 Pro demos before work, which will reduce your risk of error by 80%.
What to do after replacing the battery
Successful replacement is only half the battle, so that the new battery lasts longer.
- Calibration: Completely discharge the phone, then charge to 100% without interruption. Repeat 2-3 times.
- Charging settings: Use the original (18W) power supply or Quick Charge 3.0 certified.
- Health monitoring: Install AccuBattery (Android) to track charging cycles.
- Temperature: Do not use your phone in the cold (< -10°C) or under direct sunlight (> 40°C).
It is also recommended that:
- 🔌 Avoid charging to 100% (optimally 80-90%).
- 📵 Do not leave your phone on charge overnight.
- 🔄 Every 3 months perform a full cycle of discharge / charging.
If you use it properly, the new battery will last 3-4 years without any noticeable degradation, and if after six months the capacity has dropped by 20%, you probably have been sold a fake.