Xiaomi Redmi 8 Pro is one of the most popular budget smartphones of 2019, but even its reliable battery of 4000 mAh in 3-4 years begins to lose capacity. If your device suddenly turns off at 30-40% charge, quickly discharges or swells the case, it’s time to think about replacing the battery. In this article, we will discuss how to do it yourself without going to the service center, saving up to 70% of the cost of repair.
The procedure does not require a soldering iron or special skills, but it will require accuracy: the Redmi 8 Pro is built on latches and glue, and improper handling of the plumes can lead to failure of the display or motherboard. We will describe in detail each step from choosing a new battery to building the device, and also warn against the typical mistakes that beginners make.
Signs that the Redmi 8 Pro battery needs to be replaced
It's not always a quick battery drain that means it's malfunctioning, for example, background processes or worn-out software can create the illusion of a "dying" battery, but there are clear symptoms that signal physical wear and tear.
- 🔋 The smartphone turns off when the charge level is above 15% (even after calibration).
- 📉 Battery life has been reduced in 2-3 compared to the new device (for example, instead of 10-12 hours — 3-4).
- 🔥 The case of Redmi 8 Pro swelled or there were gaps between the screen and the frame.
- ⚡ Charging is jerky: it quickly gains interest, then “freezes” on one value.
- 🌡️ The phone heats up in the battery area even with minimal load.
If you know at least 2-3 items from the list, the probability of battery wear is 90%, and you can check the exact state of the battery using applications like AccuBattery (shows real capacity) or the built-in menu ##4636## (section "Battery Information").
⚠️ Warning: If the Redmi 8 Pro body is swelling, don't delay replacement - it's dangerous! Lithium-ion batteries in this state can ignite if mechanically exposed or overheated.
What battery to choose for Xiaomi Redmi 8 Pro: original vs analogues
The original battery for the Redmi 8 Pro is labeled BM47 (or BM48 for some batches) and has a capacity of 4,000 mAh. However, after 2021, Xiaomi stopped supplying them retail, so the market is dominated by analogues.
| Parameter | Original (if you find it) | Quality analogue | Cheap analogue |
|---|---|---|---|
| Capacity | 4000 mAh | 4000-4200 mAh | 3,500 mAh |
| Tension. | 3.85 In | 3.8–3.85 In | 3.7–3.8 |
| Thickness | 3.8-4.0 mm | 3.8. to 4.1 mm | 3.5-4.3 mm (may not fit!) |
| Connector | 3-pin (with thermistor) | 3-pin (with thermistor) | 2-pin (without thermistor) |
| Price (2026) | 2500–3500 ₽ | 1200–1800 ₽ | 600–900 ₽ |
We recommend that you stay on the analogues from proven brands: ZMI (a subsidiary of Xiaomi), Baseus, or Remax. Avoid batteries without markings, with typos in the model name or suspiciously low price – they often have deliberately low capacity (for example, instead of 4000 mAh – 2500 mAh).
Where to buy:
- 🛒 Official stores: Mi Store, Xiaomi Shop (sometimes there are originals).
- 🌍 Marketplaces: AliExpress (sellers with a rating) >98%), Wildberries, Ozon (see reviews with photos).
- 🔧 Parts shops: "Spoke Service", "Fix-Price Repair" (you can touch before buying).
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Before buying, check if there is a battery on the battery. QR-A code or hologram is a sign of a legal manufacturer, and ask the seller to send a photo of the battery in operation (many Chinese stores provide such evidence).
Battery Replacement Tools: What You Need
The Redmi 8 Pro doesn’t need expensive professional tools to disassemble, but it doesn’t need them.
- 🔧 Plastic blades / mediators (2-3 pieces) - to separate the latches of the body.
- 🔨 Thin screwdriver T3 — mounting-off.
- 🧲 Magnetic mat or container – to avoid losing small details.
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 🧴 Isopropyl alcohol (90%+) — glue-residue.
- 📦 New double-sided scotch (e.g, 3M 9448A) — battery-lock.
- 🔋 Multimeter (optional) – to check the voltage on the new battery.
Total cost of tools - about 1000-1500 ₽, But there's enough for dozens of repairs, and if you don't plan on doing this regularly, you can rent a set (many service centers rent it out for 200 to 300). ₽ day-to-day).
⚠️ Warning: Never use metal blades or knives to disassemble! they can damage plumes or puncture the battery, which will lead to a short circuit.
Turn off your smartphone and remove it. SIM-map|Battery discharge to 20-30% (for safety)|Prepare the workplace: clean desk, good lighting|Take a picture of the process of disassembly (useful when assembly)|Wear an antistatic bracelet or touch a grounded object-->
Step-by-step: how to disassemble the Redmi 8 Pro and replace the battery
Now, to the most critical point, follow the instructions in strict order, and keep your steps in check. If something goes wrong, stop and double-check.
Step 1: Turn off and prepare the smartphone
Turn off the Redmi 8 Pro completely (press the power button and select "Switch off"). SIM-If the battery is swelling, don't open the body by force - first heat the back cover with a hair dryer (1-2 minutes) around the perimeter to soften the glue.
Step 2. Remove the back cover
Insert a plastic blade into the gap between the body and the screen (start at the lower left corner where the antenna is located). Carefully drive the blade along the body, snapping the clamps. Do not apply force - if the lid does not respond, warm it up again with a hairdryer. After removing, put the lid aside (it will be useful for checking the leakage after assembly).
Step 3. Shutting down the battery
Under the lid, you'll see the battery covered with black film, and at the top there's a plastic cover, and there's a battery connector underneath, unscrew the 4 T3 screws, remove the lid, and gently unplug the plume with a spatula. Don't pull the wires!
What if the screws are "stuck"?
Step 4: Remove the old battery
The battery is glued to the body with double-sided tape, put it on the side of the shoulder blade and slowly pull it up. If the battery fails, warm it up with a hair dryer (80°C maximum) and put a thin plastic map under the bottom to separate it from the body. Don't rot or puncture the battery!
Step 5: Installation of a new battery
Before installation, check the voltage on the new battery with a multimeter (should be 3.7-3.8 V). Remove the protective film from the double-sided tape on the case and carefully glue the new battery. Make sure it lies flat, without distortion. Connect the plume to the connector (it should snap with a slight click).
Step 6: Assembly of the device
Put the plastic battery socket cover in place and twist the screws. Make sure all the plumes (display, cameras, buttons) are connected correctly. Set the back cover starting at the top and snap it around the perimeter. Turn on your smartphone and check the charge (should show 20 to 30 percent).
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After replacing the battery, be sure to calibrate: fully discharge the smartphone before turning off, then charge to 100% without interruption. Repeat the process 2-3 times to accurately display the charge level.
Common Mistakes When Replacing a Battery and How to Avoid Them
Even experienced users sometimes make mistakes that lead to the breakdown of the Redmi 8 Pro. TOP-5 The most common and ways to prevent them:
- 🔌 Display plume damage when the lid is removed. Solution: Use only plastic blades and don't pull the screen from the corner where the plume passes.
- 🔥 Battery overheating with a hairdryer (above 80)°Solution: keep the hair dryer at a distance of 10-15 cm and move it constantly without staying in one place.
- 🔋 The battery is not polarized, so there are tags on the battery and the body "+" and - - combine them before connecting.
- 📱 Forgot to plug in the power button plume. Solution: Before assembly, check all the connectors from the photo taken before disassembly.
- 🔧 Loss of screws or mis-puffing them Solution: Use a magnetic mat and twist the screws cross-cross to avoid skewing.
If the smartphone does not turn on after replacement:
- Check if the battery plume is connected.
- Make sure the battery is not swollen and the contacts are not oxidized.
- Connect the charger – sometimes an initial charge is required to start.
- If nothing helps, contact the service - the motherboard may have been damaged.
What to do after replacement: Calibration and care for the new battery
The new battery requires the right run-in to last as long as possible.
- 🔄 Calibration: In the first 3 days, fully discharge and charge your smartphone (0–100%) 2-3 times in a row.
- 🔌 Charging: Use the original Xiaomi power supply (5V/2A or 9V/2A). Avoid “fast” charging from other brands – they can shorten battery life.
- 🌡️ Temperature: Do not leave your smartphone in the sun or near heat sources. Optimal range is 10-35°C.
- 📴 Storage: If you don't use your phone for long, charge it to 40-50% and turn it off. Full discharge or 100% charge when stored is harmful.
The average life of a new battery is 2-3 years (or 500-800 charge cycles) to extend it:
- Avoid full discharge (connect charging at 10-20%).
- Do not play heavy games while charging.
- Regularly clean the charging connector from dust (alcohol tampon).
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If the battery is quickly discharged after replacing, check the background processes in the settings: Settings → Battery → Battery Use. Apps like Facebook or TikTok can use up to 30% of the charge per day!