Xiaomi Redmi 4X is one of the most popular budget smartphones of the brand, but over time, many owners face a problem: the phone suddenly turns off at 20-30% charge or shows 100%, and after an hour it discharges to zero.
In this article, you will find step-by-step calibration instructions for the Redmi 4X, including preparation, choice of method (software or manual), and answers to frequent questions. We will discuss why the smartphone lies about the percentage of charge, how to avoid calibration errors and what to do if the procedure did not work.
Why is the Redmi 4X not showing the charge correctly?
The reason is because the battery controller, the chip that tracks the level of charge, over time, because of frequent recharging, temperature changes or software failures, the controller's data travels away from the actual state of the battery.
- 🔋 Phone shows 100%, but after 10 minutes drops to 80% - controller "thinks" battery charged more than it actually is.
- 🪫 The device turns off at 15-20% - the chip incorrectly calculates the residual capacity.
- 🔄 After replacing the battery, the percentages jump chaotically – the new controller is not “trained” for your smartphone.
On the Redmi 4X, the problem is compounded by battery age: Lithium-ion batteries degrade after 300-500 charging cycles, losing up to 20-30% of capacity. Calibration will not bring the worn battery back to life, but will help to accurately display the remaining charge, avoiding sudden shutdowns.
Calibration Preparation: What to Do Before the Procedure
Calibration is stressful for the battery, so it's important to prepare the smartphone, and neglecting these steps can lead to accelerated battery degradation or even failure.
- 🔌 Use the original charger (5V/2A) — Cheap analogues can give unstable voltage.
- 🌡️ Make sure the battery temperature is between 15-35°C (check in Settings) → Battery? Overheating or cold will distort the results.
- 📴 Turn off all background processes: Settings → Annexes → Auto Start and Battery Optimization.
- 🔄 Backup your data – in rare cases, calibration can result in resetting your settings.
If you’ve recently changed your battery, wait 2-3 days before calibrating: the new controller should get used to the charging cycle. Also check if the battery is swollen – if the smartphone case is deformed, the calibration is useless (replace!).
⚠️ Warning: Do not calibrate if the phone falls into fastboot at low charge, which is a sign of critical battery degradation, and then you need to be diagnosed at the service center.
Method 1: Software calibration through the engineering menu
The safest way is to use the hidden engineering menu (#4636##) which is suitable for most users and does not require root rights.
- Open the Phone app and enter the combination: ##4636##.
- In the menu that appears, select Battery Information.
- Look at the Battery level parameter – it should match the percentages in the status bar.
- Connect the charger and wait 100%, then turn off the power and discharge the phone until it turns off automatically.
- Repeat the charging/discharge cycle 2-3 times. After the third cycle, check the data in the engineering menu - it should stabilize.
If you still have percentages after the procedure, try resetting the battery settings in the same menu (Battery calibration or Reset battery stats option), which may not be available on some firmware.
Charge to 100% and hold for 1 hour on charging|Discharge before switching off (do not turn on before recharging!)|Repeat the cycle 3 times|Check the data in ##4636##|Reset battery statistics (if available)-->
Method 2: Manual calibration (for experienced users)
This method requires a battery discharge of up to 0% and then a "training" of the controller. It is more efficient, but it is risky: if you interrupt the process, you can damage the battery.
Algorithm of action:
- Charge your phone to 100% and keep charging for another 1-2 hours after reaching the maximum.
- Turn off the charger and use your smartphone in intensive mode (games, video, navigation) until full discharge.
- Do not turn on the phone right away. Connect the charger and charge for at least 8 hours (even if the indicator shows 100% sooner).
- Repeat the discharge-charging cycle 2 more times.
After the third cycle, the controller must update the actual capacity data, and if the phone still lies about the charge, the problem may be battery wear (check in the AccuBattery app) or firmware failure.
⚠️ Warning: Do not use fast charging during calibration, this distorts the controller data. → Battery → Fast charging.
What if the phone doesn’t turn on after discharge?
Checking Results: How to Know That Calibration Helped
The effectiveness of the procedure can be assessed by three criteria:
| Parameter | Before calibration | After calibration |
|---|---|---|
| Battery operating time | Sharp jumps (e.g., from 50% to 10% in 10 minutes) | Smooth charge reduction (1–2% per hour in standby mode) |
| Percentage accuracy | The phone is turned off at 15-20% | Shutdown at 0–3% (permissible spread) |
| Data in AccuBattery | Difference between “real” and “showed” capacity >15% | Difference <5% |
| Battery temperature | Overheating during charging (>40°C) | Stable temperature (25–35°C) |
For an objective assessment, use the AccuBattery app (available on Google Play), which shows the actual battery capacity and compares it to the controller data, and if the difference after calibration is greater than 10%, the battery is probably worn out and needs to be replaced.
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After calibration, avoid charging 5-10% – try to charge your phone from 20% to 80%, which will prolong the life of the battery by 20-30%.
Frequent Mistakes and How to Avoid Them
Many users make the problem worse by doing the wrong thing.-5 errors in the Redmi calibration 4X:
- ⚡ Use of a non-original charger – cheap adapters give unstable voltage, which knocks the controller.
- 🛑 Breaking the discharge cycle (e.g. turning the phone on 1% for the “last call”) – this zeros out the entire process.
- 🔥 High temperature calibration (>35°C) — accelerates battery degradation.
- 🔄 Skipping the “recharging” stage (when the phone already shows 100%, but it is kept on charging for another 1-2 hours).
- 📱 Using your phone while charging (games, videos) – creates parasitic load.
If you make one of these mistakes, start calibrating again, and it is not recommended to perform the procedure more than 1 time every 3 months - this can reduce battery life.
When calibration won't help: signs of battery wear
Calibration is useless if the problem is the physical wear of the battery.
- 🔋 Battery bloating (phone case “opened”, the screen moved away from the frame).
- ⚡ The phone only charges in a certain position (contact problem).
- 🌡️ Battery heats up to >45°C even under light load.
- 📉 Real capacity (accuBattery) < 60% of factory (1500 mAh of 3000 mAh).
- 🔌 The swelling is going to stop (it will stop).
In such cases, the only solution is to replace the battery. On the Redmi 4X, the original battery costs ~ 1000-1500 rubles, and replacing in the service will cost 500-800 rubles. Don't skimp on cheap analogues - they can swell or ignite!
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Calibration only corrects the controller's software errors. If the battery is physically worn out (blown, capacity loss >40%), a replacement is required.