The Xiaomi Redmi 6, released in 2018, is still a popular budget smartphone due to its balanced specs and affordable price. However, after 4-5 years of active use, even the most reliable battery loses up to 30-40% of capacity, which leads to rapid discharge, sudden blackouts and charging problems. If your Redmi 6 has become “hold on” for only a few hours, and the battery indicator jumps from 50% to 1% per minute, it’s time to think about replacing.
In this article, we’ll take a look at everything you need to know about replacing your battery with a Xiaomi Redmi 6, from choosing a quality battery to taking your phone down in a step-by-step fashion, taking into account typical bugs. You’ll learn what tools you’ll need, how to safely unplug the plumes, and what to do if the phone doesn’t turn on after you replace it, and why Xiaomi’s original Redmi 6 batteries are no longer manufactured, and what 2026 analogs are considered the best.
Signs that it is time to change the battery
It's not always a quick discharge that means battery wear -- sometimes software failures or applications' background power consumption are the problem, but there are 5 key symptoms that directly indicate physical battery wear:
- 🔋 Phone's running out of power. 2-3 hours with minimal load (social networks, instant messengers).
- 📉 The percentage of charge “jumps” (for example, from 40% immediately to 15%) or gets stuck at one value.
- 🔌 Charging is extremely slow (less than 1% per minute) or interrupted.
- 🔥 The phone body heats up strongly in the battery area (even without loading).
- 💥 The phone turns off when 20-30% charge and not activated without recharging.
If you see at least 2-3 signs on the list, testing with apps like AccuBattery or AIDA64 will only confirm wear. For example, in AccuBattery, look for a Healthy Battery setting – if it is below 70%, a replacement is inevitable.
⚠️ Warning: If the phone swells in the battery area (the body is deformed, the screen "goes away"), immediately disconnect it from charging and do not use.
For accurate diagnosis, you can check the real capacity through the engineering menu:
#4636## → “Battery Information” → “Charge Level” parameter (should match the displayed percentage).A difference of more than 10% is a reason to replace it.
What battery to choose for Redmi 6: original vs analogues
Xiaomi Redmi 6 is equipped with a battery of the Li-Pol type (lithium polymer) with a nominal capacity of 3000 mAh and a voltage of 3.85 V. The original batteries from Xiaomi for this model are no longer produced, but there are quality analogues on the market that are not inferior in characteristics.
When choosing, pay attention to:
- 🔍 Marking: Must match the original — BM43 or BM47 (supplant NFC).
- 📦 Set: the set should be adhesive strips for fixation and insulation film.
- 🔋 Capacity: do not take batteries with a margin (for example, 4000 mAh) - this is a marketing ploy, the real capacity will be lower.
- 🏭 Manufacturers: Reliable Brands — ZOP Power, Camelion, Baseus (Battery Pro Series).
| Manufacturer | Model battery model | Capacity | Price (2026) | Features |
|---|---|---|---|---|
| ZOP Power | BM43-3000mAh | 3,000 mAh | 800-1200 ₽ | 3.8 mm thick, complete with glue and screwdriver |
| Camelion | CR-BM43 | 3100 mAh | 1000-1400 ₽ | Overheating protection, 12 months warranty |
| Baseus | Battery Pro BM47 | 3,000 mAh | 1300-1600 ₽ | Suitable for Redmi 6/6A, resistant to charging cycles |
| No-name (AliExpress) | BM43 Generic | 2800-3000 mAh | 400-700 ₽ | Low quality risk, no guarantee |
Avoid batteries labeled “High Capacity” or “Premium” without specifying the exact capacity – these are often fakes with understated performance. Also check that the battery has a production date (not older than 1 year) – lithium polymer batteries degrade even in packaging.
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Before you buy, ask the seller to send you a photo of the battery with the label. BM43 has a holographic sticker with QR-The code is available on Xiaomi’s website (although the batteries themselves are no longer original).
Preparing for replacement: tools and safety
To replace the battery with the Redmi 6, you will need a minimum set of tools, but you can not do without them.
- 🔧 Plastic blades (2-3 (p.c.) to separate the shell.
- ⚙️ Cross screwdriver (size) PH00 or PH0).
- 🔥 Hair dryer or thermo-air station for softening glue.
- 🧲 Magnetic mat or screw container (easy to lose!).
- 🩹 Insulation tape (to protect contacts).
- 🔌 Multimeter (optional, to check the voltage).
Also prepare the workplace:
Work on a flat, clean surface (it is better to cover the table with paper).
Make sure there is no dust in the room – it can get inside the phone.
- Turn off the phone and remove it. SIM-card with memory card (if any).
⚠️ Warning: If you’ve never disassembled your phones, practice on an unnecessary device or watch a video instruction (link to the link below) FAQ). Disassembly errors can damage the display plume or motherboard – repairs will cost more than a new battery.
Before starting work, completely discharge the phone (before turning off automatically), this minimizes the risk of short circuits when the battery is disconnected, and it is also recommended to wear an antistatic bracelet or periodically touch a grounded metal object to relieve static electricity.
Turn off the phone and remove it. SIM-map|Discharge the battery to 0%|Prepare tools and workplace|Check the new battery for integrity|Take a picture of the location of the screws before disassembly-->
Step-by-step: how to disassemble the Redmi 6 and replace the battery
The Xiaomi Redmi 6 is a medium-sized device, with no removable back cover and battery glued to the body. Follow the instructions carefully to avoid damaging the plumes.
Step 1: Removing the back cover
1. Heat the back cover of the phone around the perimeter with a hair dryer for 1-2 minutes (temperature ~60°C).
2. Insert a plastic blade into the gap between the lid and the housing (start at the lower corner where the charging connector is located).
3. Carefully drive the blade along the body, separating the lid. Do not force - if the lid does not respond, warm up again.
Step 2: Battery disconnection
1. Unscrew 10 screws that fix the metal plate (they are of different lengths - remember the location!).
2. Take care of the plate and remove it, and underneath it you will see the battery plume (a black connector with red and black wires).
3. Unplug the plume with a spatula or tweezers. Don't pull the wires!
Step 3: Remove the old battery
1. The battery is glued to the body. Put it on the side of the shoulder blade and pull it up. If the glue is too strong, you can heat the battery with a hair dryer (no more than 50 ° C!).
2 Remove the glue residue from the body with alcohol or acetone. Do not use metal objects - they can puncture a new battery.
Step 4: Installation of a new battery
1. Check the polarity: red wire is +, black wire is -. The battery and phone should match the tags.
2. glue the new battery (use adhesive strips from the kit or double-sided scotch).
3. Connect the plume and fix the metal plate with screws.
Step 5: Assembly of the phone
1. Make sure all plumes (display, cameras, speaker) are connected correctly.
2. Press the back cover and warm it up with a hair dryer to activate the glue.
3. Twirl two screws at the charging connector (they are often lost!).
After assembly, do not turn on the phone immediately - let the glue dry for 10-15 minutes.
What if the phone doesn’t turn on after replacement?
Calibration of the new battery: why it matters
Once the battery is replaced, it needs to be calibrated so that the phone's power controller can correctly determine the charge level, and without calibration, you can see percentage spikes or incorrect display of operating time.
How to calibrate:
- Completely discharge the phone before automatically shutting down.
- Connect to charging and charge for 8-10 hours (even if the indicator shows 100%).
- Turn off the charger and turn on the phone. If it shows less than 100%, re-connect the charger for 1-2 hours.
- Repeat the discharge-charging cycle 2-3 times.
You can also use calibration apps like Battery Calibration (available on Google Play) to reset data about charging cycles, which helps the controller to "reset" the statistics.
⚠️ Warning: If the phone still shows the wrong percentage of charge after calibration, the problem may be the power controller on the motherboard, in which case only the diagnostics at the service center will help.
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Calibration of the new battery takes up to 24 hours, but without it, the phone may misrepresent its charge level or discharge quickly.
Common Mistakes and How to Avoid Them
Even with a careful battery change, you can make mistakes that will damage your phone or quickly wear out your new battery.
- 🔧 Using metal tools to separate the battery is a risk of puncture and short circuit. Use only plastic blades.
- 🔥 Battery overheating with a hairdryer (more) 60°C. It could damage the structure. Keep the hair dryer at a distance. 10-15 centimeter.
- 🧲 Loss of screws: Redmi 6 has different lengths, and if you mix them up, you can damage the motherboard.
- 🔌 Connecting the battery to reverse polarity is guaranteed to burn the power controller. Always check the tags «+» and «–».
- 📱 Build a phone with unconnected plumes (display, cameras). Before fixing the lid, check all connectors.
Another common problem is the rapid wear and tear of a new battery, to extend its lifespan.
- 🔋 Avoid full discharge (connect charging when you are in charge). 10-20%).
- ⚡ Do not use fast charging (if the phone supports) – it accelerates degradation.
- 🌡️ Do not leave your phone on charge in temperatures above 30°C (e.g. in the sun).
If the battery is running out too quickly after replacing, check the background consumption in settings: Settings → Battery → Battery Use. Apps like Facebook or TikTok can use up to 20% charge per hour.