Removing the battery on the Xiaomi Redmi Note 4 is a challenge that owners face when replacing the battery, repairing the motherboard or cleaning the case from dust. Despite its apparent simplicity, the process requires care: improper actions can lead to damage to the plumes, battery rupture or even short circuit. In this article, we will analyze the step-by-step instructions taking into account the features of the model, a list of necessary tools and critical nuances that are not mentioned in the standard guides.
Redmi Note 4
mido
4100mAh
Xiaomi
Before you start, consider disassembling. If your goal is to just clean the phone of dust, you may need to blow the connectors with compressed air without completely removing the battery. If the battery is swelling (as seen from the deformation of the screen or back cover), the removal becomes mandatory - further operation of the device is dangerous!
Preparation: security tools and measures
For safe removal of the battery you will need:
- 🔧 Plastic mediators (2-3 (a) - to separate the body without scratching.
- 🔥 Dryer or thermo-air station - for softening the glue (temperature 60-80)°C).
- 🧲 Suction - will help to lift the back cover after heating.
- ⚡ Captone tape or tape – to isolate the contacts of the battery after disconnection.
- 🔍 Loop or magnifying glass - so as not to miss the hidden latches.
⚠️ Warning: Never use metal tools (screwdrivers, knives) to tweak the battery! The risk of puncture or closure of contacts is extremely high. If you do not have plastic mediators, replace them with guitar mediators or bank cards (but not credit cards - they are too thin).
Before starting work, completely discharge the phone (before you turn off automatically) or remove the battery when the device is turned off, if possible, this minimizes the risk of short circuit.
- 🪑 Work on a table with a flat surface covered with soft cloth.
- 📱 Disconnect all cables and accessories from your phone.
- 🔋 Make sure you have a fire extinguisher on hand (in case a lithium-ion battery fires).
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If you don't have a hair dryer, you can use a household iron at minimum power. Warm the back cover through the towel for 2-3 minutes, avoiding overheating the display.
Step 1: Removing the back cover
The back cover of the Redmi Note 4 is mounted on latches and glue to remove it.
- Heat the edge of the lid with a hair dryer around the perimeter (especially in the area of power buttons and volume) for 1-2 minutes.
- Apply a suction cup to the bottom of the phone (where the USB-C connector is located) and pull up.
- Insert a plastic mediator into the resulting gap and carefully lead it along the body, snapping the latches.
⚠️ Attention: Don't apply excessive force to the area of the camera, there's an antenna plume underneath, which is easily damaged, and if the lid doesn't respond, reheat the area of the problem.
After removing the cover, you will see:
- 🔋 Battery with connected connector.
- 📶 Antenna modules (do not touch them unnecessarily!).
- 🔧 Screws that fasten the motherboard (you do not need to touch them if you do not plan to completely disassemble).
What to do if the lid is cracked?
Step 2: Shutting off the battery
Before physically removing the battery, be sure to disconnect it from the motherboard:
- Find the battery connector - it is located under a black protective tape (take care of it).
- With a plastic mediator, pull the connector upwards, moving parallel to the board. Don't pull the wires!
- Close the connector with tape to avoid accidental contact.
Critical error: Many users try to remove the battery without disconnecting it from the board, which can lead to short circuits when contacts are accidentally closed by a mediator or screwdriver.
After turning off, check the voltage with a multimeter at the battery contacts (if you have experience). Normally, it should be 0 V (or close to this). If the voltage is maintained, then the battery is not completely turned off, repeat step 2.
| Contact | Color of wire | Appointment | Voltage (with the connector disconnected) |
|---|---|---|---|
| 1 | Red. | Plus (+) | 0 In |
| 2 | Black. | Minus (-) | 0 In |
| 3 | White/yellow | Thermistor (temperature sensor) | 0-0.5 B |
Step 3: Removing the battery
The battery in the Redmi Note 4 is glued to the body with double-sided tape to remove it:
- Reheat the battery with a hairdryer (temperature not higher than 80 ° C!) for 30-40 seconds.
- Put a plastic mediator on the edge of the battery (start with the top where there are no plumes).
- Carefully pull up while putting glue around the perimeter.
⚠️ Attention: If the battery is swelling, it is absolutely not allowed to be pierced or bent! Bloated indicates an unstable chemical reaction inside - the risk of fire or explosion if the shell is damaged is extremely high:
- 🛑 Stop your withdrawal attempts immediately.
- 📞 Contact the service center marked "bloated battery".
- 🔥 Do not leave your phone unattended, especially when charging.
If the battery sits too tight, use isopropyl alcohol (90%+):
- Put a few drops of alcohol under the edge of the battery (not on the battery itself!).
- Wait 1-2 minutes - the alcohol will dissolve the glue.
- Repeat the extraction attempt.
Phone's off and discharged.|Battery connector disconnected from the board|Tools are not metal.|Workplace prepared (soft surface, fire extinguisher)|Heat up is carried out evenly, without overheating-->
Step 4: Installation of a new battery
If you are replacing the battery, follow these rules when installing a new one:
- 🔋 Check compatibility: Original battery for Redmi Note 4 has articular MB11205 (4100mAh, 3.85V).
- 🧹 Clean the seat from the remnants of old glue with alcohol or scraper.
- 📏 Make sure the new battery is not thicker than the old one (maximum thickness 4.5 mm).
- 🔌 Connect the battery connector to the board last, after fixing with glue.
Use 3M double-sided tape or special battery glue (e.g. B-7000) to lock the new battery, apply a thin layer of glue around the perimeter, avoiding the center (there are sensitive elements). Press the battery for 1-2 minutes, then assemble the phone in reverse sequence.
After assembly:
- Connect your phone to charge and check if the new battery is recognized (in Settings → Battery Status).
- Perform 2-3 full charge/discharge cycles to calibrate the controller.
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Never use superglue or heat glue to fix the battery! these compounds can damage the battery shell and lead to a chemical reaction.
Frequent Mistakes and How to Avoid Them
Even experienced users make mistakes when working with the Redmi Note 4 battery.
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Use of metal tools | Battery puncture, short circuit. | Use only plastic mediators |
| Battery overheating (>80°C) | Bloating, loss of capacity | Control the temperature with a thermocouple |
| The antenna plume's ripping off | Loss of network or Wi-Fi | Carefully work in the camera area |
| Installation of a battery of another capacity | Fast wear, overheating | Check the article and parameters of the new battery |
Another common problem is that the phone doesn't turn on after assembly, and the reasons may be:
- 🔌 Unconnected battery connector (check contact density).
- 🔧 Forgotten screws on the motherboard (they can close contacts).
- 📱 Damaged plume of the power button (a frequent problem with careless disassembly).
If the phone isn't responding to charging, try plugging it into your PC and checking if it's detected in Device Manager. If so, there's a problem in the screen or the display plume. If not, there's probably a motherboard that's damaged.
When to contact the service
Not all situations can be solved by yourself. Contact the service center if:
- 🔥 Battery swelling or deformed (risk of fire!).
- 💥 When disassembling appeared the smell of burning or smoke.
- 📱 The phone will not turn on even after checking all the connectors.
- 🔧 You damaged the plumes or contacts on the motherboard.
The cost of replacing the battery in official Xiaomi services is 1500-2500 rubles (2026), depending on the region. informal workshops may offer a lower price, but the risk of installing a poor battery is higher.
- 📄 Availability of a work guarantee (minimum 3 months).
- 🔋 Do they use original batteries (ask the article).
- 📸 Do photos provide reports on the work done.
If you are in doubt, it is better to pay for a professional replacement than to risk damaging the phone. For example, replacing the display plume will cost 3000-5000 rubles, and repairing the motherboard - from 8000 rubles.