Xiaomi Redmi S2
Replacing the battery on your own with the Redmi S2 is a medium-sized task that requires precision and the right tools. In this article, we will go through the entire process, from choosing a new battery to assembling a phone, learn what mistakes beginners most often make, how to avoid damage to the plumes, and what to do if the phone does not turn on after replacing.
Important: If you’ve never taken a smartphone apart, we recommend watching video instructions first (links are at the end of this article) or practicing on an old device. Incorrect replacement can lead to loss of warranty (if it’s still valid), damage to the motherboard, or even fire a non-original battery.
Signs that the Xiaomi Redmi S2 battery is time to change
How do you know if the battery is the problem, not the software or the charger?
- 🔋 The phone turns off when 20-40% The indicator is normal, although the indicator shows a normal level.
- ⚡ The battery is discharged for 2-3 Even in standby mode (without active use).
- 🔌 Charging is jerky: it quickly gains interest, then “hangs” at the same level.
- 🌡️ The body of the phone is very hot during charging or work.
- 📉 In settings (Settings) → Battery → Battery status) indicated that the capacity has fallen below 70% of the original.
If you have at least 2-3 items on your Redmi S2 list, it is likely that your battery is worn out. Before replacing, check your phone for viruses (they can drain the battery) and reset to factory settings (Settings → Additional → Recovery and Reset).
⚠️ Attention: If the phone is swollen (the body has become convex, the screen "steps away" from the frame), you can not try to disassemble it yourself! Lithium-ion batteries in this state can ignite.
What battery to choose for Xiaomi Redmi S2: original vs analogues
The original battery for the Redmi S2 is marked BM47 and a capacity of 3080 mAh. However, after 2020, Xiaomi stopped supplying original batteries to retail, so you will have to choose between:
- 🔄 OEM substitutes (from manufacturers supplying components for Xiaomi: BTY-M5, BM47 (Non-original Price: 800-1200 ₽.
- 📦 Analogues from third-party brands (e.g. Baseus, Remax, Patona) can be higher (up to 3,500 mAh), but the quality of charge control is worse. Price: 500-900 ₽.
- 🔋 The second-hand version is the battery, which can be worn out. 400-700 ₽.
We recommend buying OEMs labeled BM47s, which are as close to the original in performance as possible. Avoid unlabeled batteries labeled "Ultra Power" or "Super Capacity" -- these are fakes with understated real capacity.
| Type of battery | Capacity | Term of service | Price. | Where to buy |
|---|---|---|---|---|
| OEM substitute (BM47) | 3080–3100 mAh | 2–3 years | 800–1200 ₽ | AliExpress, Beru, official services |
| Analogue (Baseus/Remax) | 3200-3500 mAh | 1-2 years | 500–900 ₽ | Marketplaces, radio markets |
| B/o original | 2500-3,000 mAh | 0.5–1 year | 400–700 ₽ | Avito, local services |
⚠️ Warning: When buying, make sure that the battery has a hologram with a serial number and a production date (not older than 1 year). Batteries without these tags often turn out to be fakes with a real capacity of 1500-2000 mAh.
Tools for replacing the Xiaomi Redmi S2 battery
To disassemble the Redmi S2, you will need:
- 🔧 Plastic blades (mediators) - for separation of the back cover and the battery.
- 🔨 The screwdriver (PH00 or PH0) — screw-off.
- 🧲 Magnetic mat or container – to avoid losing small details.
- 🔥 Hair dryer or thermoair station - for softening the glue (optional, but simplifies the task).
- 📏 Suction (for the screen) - will help to put the cover.
- 🧴 Isopropyl alcohol (90%+) — Cleaning contacts and removing glue residues.
Also prepare a new double-sided tape for battery fixation (usually comes with a battery) and thin gloves - lithium-ion batteries do not like static electricity.
Did you turn off the phone and pull it out? SIM-map|Did the phone charge up to 30% (to avoid short circuits)|Prepared the workplace (clean surface, good lighting)|Have you taken pictures of the location of the plumes (in case of an error during assembly)-->
Step-by-step: how to disassemble Xiaomi Redmi S2 and replace the battery
Now, to the most critical stage, follow the instructions in strict order so that you don't damage the plumes or the motherboard.
Step 1: Removing the back cover
1. Turn off the phone and remove the tray for SIM-map.
2. heat the hair dryer back cover around the perimeter (temperature) ~60°C) for 1-2 minutes. This will soften the glue.
3. Insert a plastic blade into the gap between the lid and the body (start at the lower right corner where the tray is for the SIM). Carefully drive the blade along the edge, separating the latches.
4 When the lid starts to move, put a sucker on it and take it off completely.
What to do if the lid does not lend itself?
Step 2: Disconnect the battery plume
1 Unscrew 4 screws that lock the metal plate over the battery (use the PH00 screwdriver).
2. Take care of the plate and take it off, and underneath it you'll see the battery plume, a thin black wire with a connector.
3. Be sure to take a picture of the plume's location before you turn it off! Then, with a plastic blade, gently tuck the connector and unplug it from the motherboard.
⚠️ Attention: If you accidentally touch the motherboard with a metal tool, it may cause a short circuit!
Step 3: Remove the old battery
1. Put a plastic blade on the battery from any angle, and it's glued to the body, so you're going to have to put a lot of effort.
2 If the battery fails, heat it with a hair dryer (not higher than 60°C!) or drip a little isopropyl alcohol under the edge - this will dissolve the glue.
3. Take the battery out carefully. Don't rot or puncture it! A damaged lithium-ion battery could ignite.
Step 4: Installation of a new battery
1. Clear the place under the battery from glue residues with alcohol and a napkin.
2. Remove the protective film from the double-sided tape on the new battery and gently set it in place.
3. Connect the plume to the motherboard (focus on the photo taken earlier!).
4. Secure the metal plate and twist the screws.
Step 5: Assembly of the phone
1. Make sure all plumes are connected and nothing prevents the back cover from standing in place.
2. Put the lid on and press it tightly around the perimeter so that the latches fall into place.
3. Insert the tray for SIM-card and turn on the phone.
- Is the battery plume connected correctly (sometimes it falls out during assembly).
- Are there any foreign objects (screws, pieces of scotch) left inside?
- Have you damaged the flexible plume of the screen (it goes along the right edge).
If nothing helps, try charging your phone for 10-15 minutes and then turn it on.-->
What to do after battery replacement: calibration and testing
Even if you did everything right, the new battery might not work properly for the first few days.
- Completely discharge and charge. Discharge the phone to automatically shut down, then charge to 100% without interruption. Repeat the process 2-3 times, which will help the battery controller to "learn" how to correctly display the charge level.
- Check in Settings → Battery. Make sure the capacity is displayed correctly (for BM47 it is ~3080 mAh). If it shows less than 2500 mAh, it may be defective or poorly connected.
- Heat test: During charging, the phone should not heat above 40°C. If it is hot, check if the new battery is swollen (this is a sign of defect).
We also recommend you install the AccuBattery app (available on Google Play) to track battery status, which will show real capacity, discharge rate and temperature.
- Poor contact of battery plume (check connection).
- A broken battery (especially if you bought a cheap analogue).
- Background energy consumption (check the applications in Settings → Battery → Usage).
Frequent battery replacement errors and how to avoid them
Even experienced craftsmen sometimes make mistakes that cause the phone to break down.
- 🔌 Damage to the battery plume, often torn off with the connector because it's too sharp. Solution: always pull the connector on the side instead of pulling it up.
- 🔥 Battery overheating with a hair dryer.°C, the battery may swell or lose capacity. Solution: use a thermometer or heat for no more than 1-2 minutes.
- 📱 Damage to the flexible plume of the screen, which goes along the right edge and breaks easily. Solution: don't push the right side of the lid when you build it.
- 🔋 Use of non-original glue.Solution: buy glue 3M Or the original scotch from Xiaomi.
If you've damaged a plume or a motherboard, don't try to fix it yourself, go to the service, and it's cheaper to repair than it is to buy a new phone.
How much does it cost to replace the Xiaomi Redmi S2 battery in the service?
If you're not sure about your ability, you can contact a service center, and the cost of replacing it depends on the type of battery and the region:
| Type of service | Cost of work | Battery cost | Totally. | Guarantee |
|---|---|---|---|---|
| Official Xiaomi service | 1500–2000 ₽ | 1200–1500 ₽ (OEM) | 2700–3500 ₽ | 6 months |
| Informal service | 500–1000 ₽ | 500–1200 ₽ (analogue) | 1000–2200 ₽ | 1-3 months |
| Self-sustaining replacement | 0 ₽ | 500–1500 ₽ | 500–1500 ₽ | Depends on the store. |
Official services are more expensive, but they guarantee and use quality parts. In small workshops, you can save money, but the risk of running into a fake is higher. If you choose a self-substitute, the final cost will be 2-3 times cheaper.