How to Calibrate the Battery on Xiaomi Redmi 4

Redmi 4 series smartphones, despite their age, remain popular due to their reliability and autonomy. However, over time, even the highest quality lithium-ion battery loses the ability to correctly display the remaining charge. Users often face a situation where the phone shows 20% of power and suddenly turns off, or charging stops at 99% and does not go further. These are classic signs of desynchronization of the power controller and the actual capacity of the cell.

The process of restoring accuracy is called calibration. It's important to understand that this procedure does not restore the physical capacity of a worn-out battery, but makes the Android system and MIUI read current data correctly. Battery calibration is a software reset of usage statistics that helps the controller re-determine the upper and lower limits of charge. If your Xiaomi Redmi 4 has started to behave strangely, don't rush to buy a new battery - maybe it just needs the right setup.

In this article, we will look at the time-tested methods that are safe for your device, we will look at both standard root-free methods and more advanced options for power users. Follow the sequence of actions is critical to achieving a positive result. Don't miss steps, because interrupting the process can reduce all efforts to zero.

Symptoms of the need for battery calibration

Before you start taking action, you need to make sure that the problem is software failure, not physical degradation of battery chemistry. There are clear indicators that indicate that the power system needs intervention. Ignoring these signals can lead to the fact that you will use the device in suboptimal mode, constantly afraid of a sudden shutdown.

One of the most obvious signs is a jump in the percentage of charge. 45%, Five minutes without active screen operation — 30%, And after connecting the charge, the number instantly jumps to 80%. Also a wake-up call is a situation when the phone turns off at higher rates. 10-15%. This suggests that the controller thinks there is still power, even though it is physically insufficient to run the processor.

Another symptom is that charging to 100% is suspiciously fast, but it also discharges rapidly. In normal condition, the Redmi 4 with a 4100 mAh battery must charge for about two hours using a regular power supply, and if the process takes 30-40 minutes, this is a clear distortion of data.

• 📉 Sharp jumps in charge percentages in both directions without connecting to the network.
• 🔌 The smartphone is turned off when the remaining charge 10-20%.
• ⏱ Charging to 100% is much faster than usual time.
• 📉 The percentage of charge “frozen” at one value for a long time, and then falls rapidly.

It's worth noting that if the phone has been exposed to extreme temperatures for several years, the software calibration may not have the desired effect, in which case the physical wear is the root cause, and no adjustments will return the lost capacity, but even then the procedure will help the system to more honestly display the remaining operating time.

⚠️ Note: If the back cover of your Xiaomi Redmi 4 is swollen or the battery visibly inflated, no calibration will help.The use of such a device is dangerous - the battery must be replaced immediately to avoid fire or damage to the case.

Preparation of the device for the recovery procedure

The success of the operation depends on proper preparation. You can't just start to discharge the phone at any time; you need to create certain conditions for the power controller to go into calibration mode. The first step is to completely reset the current readings through deep discharge, which is necessary for the controller to lock in the point of absolute zero.

Use your smartphone as normal, but try to load it: turn the screen brightness to maximum, launch a heavy app or game, activate GPS and Bluetooth. If the phone turns off on its own, don't rush to turn it on. Let it lie off for at least a few hours, or better, leave it overnight, which will allow the residual current to completely escape the circuit.

Once the device is turned off, try turning it on. If the Mi logo appears and the phone boots, discharge it again before it turns off. Repeat the turn-on-off cycle until the smartphone stops responding to the power button at all. Only when the screen is black and there is no reaction to presses can the deep discharge stage be considered complete.

It is important not to connect the charger during this "agony"; the controller must fix the lower limit of voltage at which the system considers the battery empty, interrupting this process will lead to the lower limit being set incorrectly and calibration will be wasted.

Manual Calibration Method without Root Rights

This is the safest and most recommended way for most Xiaomi Redmi 4 users. It does not require the installation of third-party software or obtaining superuser rights, which preserves the warranty (if it is still relevant) and the integrity of the system.

Take an original or certified charger. Connect the phone to the grid. The charger should catch fire. Leave the device to charge off until the indicator shows 100%. Even if the screen is out, it does not mean that the process is complete, the current continues to flow into the battery.

After the 100% Don't turn off the cable right away. Leave the phone on charge for at least another charge. 1-2 This is necessary for the so-called top-off charge (dole), which equalizes the voltage in all cells of the battery. MIUI Often stop the indication ahead of time, and this step compensates for the error.

Once you've held your phone on charge, turn off the cable and turn the device on. If you're not seeing 100% when you boot, but 98% or 99%, re-energize the charger (you can do it right when the phone is on) and get the full hundred. Then run a standard cycle: discharge the phone before turning off in normal mode and recharge to the end without interruptions.

To fix the result, it is recommended to repeat the full discharge-charge cycle 2-3 times in a row, this will allow the Redmi 4 power controller to rewrite the table of correspondence of voltage and percent in its memory, after the third cycle, the statistics should be updated and the readings will become more realistic.

Use of engineering menus and hidden commands

For more advanced users who want to access internal battery statistics, there is an Android engineering menu, which can be limited on Xiaomi smartphones, but often uses special codes through the Phone app to see the actual voltage and temperature, ignoring the beautiful numbers on the screen.

To get into the diagnostics menu, open the dial and enter the code ##6484## or #4636##. If the first code opens the testing menu (CIT), look for "Battery Indicator" or "Status." The second code leads to the standard Android menu, where you need to select "Battery Information".

Here you will see the parameter "Level" (charge level) in percent and "Voltage". Pay attention to the voltage: a fully charged Li-Ion battery has a voltage of about 4.2-4.35 V, and a discharged one - about 3.4-3.6 V. If you see a voltage of 3.8 V and above in the reading 20%, then calibration is really necessary, since the phone "lies" about the amount of power.

Codes for entering the engineering menu:


1. ##6484## (CIT Menu)




2. ##4636## (Testing Menu)




3. ##7780## (Resetting settings - use with caution)

Some versions of MIUI have a command to reset battery statistics via ADB (Android Debug Bridge), but it requires a PC connection. If you have ADB installed, the adb shell dumpsys batterystats --reset command will clear your discharge history. However, on newer versions of Android, this command often doesn't work without root rights, since the statistics file is protected.

Using engineering data helps us understand whether calibration is worthwhile at all. If the voltage corresponds to the percentage of charge (for example, 50% is about 3.85 V), then the problem may not be in the calibration, but in the background processes that quickly land the battery.

Application of specialized applications

If manual methods seem too long, you can use the specialized software from Google Play. There are many utilities that automate the process or help remove old statistics files. However, be careful: many of them just show ads and do not do real work with the controller.

One of the time-tested applications is Battery Calibration (various variations from different developers) and the principle is simple: the application requests permissions to write system files (often requires root), deletes the batterystats.bin file, and creates a new, clean statistics file when fully charged. Without root rights, such applications work in "advisor" mode, instructing you when to turn off charging.

Another popular tool is AccuBattery, which doesn't literally calibrate the battery (does not reset the controller), but it does measure the actual capacity. Install an app, use your phone for a few days, and it will show how many mAh your battery actually gains compared to the factory battery, and it's a great way to diagnose battery health.

When you use any application, remember that they're just tools, they can't rock a chemical element or increase its capacity, and their job is to get the hardware to work together properly with the MIUI operating system.

⚠️ Warning: Avoid apps with names like Battery Saver, Super Charger, or Boost Battery that promise to increase capacity by many times. This is a marketing hoax. Physical laws cannot be circumvented by software, and such programs are often themselves miner viruses or data collectors.

Analysis of results and typical errors

After all the procedures, it is important to evaluate the result correctly. Don't expect the battery to start holding a charge like new if it is already 3-4 years old. The purpose of calibration is honest percentages, not magic. If after 3-5 cycles the full discharge-charge situation has not changed (the phone still turns off by 30%), then the problem is hardware.

A common mistake users make is to interrupt the charging process. During calibration, it is not recommended to use the phone while it is charging. The power surges of the processor can knock the controller down, and it will incorrectly determine the moment of transition to saturation mode.

It is also a mistake to use poor-quality cables and power supplies. Cheap cables have high resistance, which causes the battery to reach the current with losses, and the controller can misread parameters. For Redmi 4, it is better to use the original 5V/2A unit.

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Use Flight mode during calibration charging, which will shut down all radio modules and provide a stable charge current without jumping, which will improve calibration accuracy.

If you did everything right but the problem remained, check the body temperature. Overheating above 45 degrees or operating in the cold below 0 degrees temporarily distorts the battery readings. Let the phone cool or warm to room temperature and check the readings again.

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Calibration is only effective with a battery in good condition, and if the battery is physically worn out (residual capacity less than 60%), software methods will only have a temporary and weak effect.

Prevention and prolongation of battery life

So that after a successful calibration, the problem doesn't come back in a month, you have to follow the rules of operation of lithium-ion batteries. The main enemy of the battery is extremes. Don't let the deep discharge to zero regularly and don't keep the phone charging for days after reaching 100%.

The optimal range for longevity chemistry is 20 to 80 percent. Try to keep the charge within that range. Xiaomi's current controllers can optimize charging when it's enabled in the settings, but manual discipline gives the best result. Also avoid overheating: don't play heavy games while charging.

• 🌡 Don’t leave your phone in the sun or on your car panel in the summer.
• 🔌 Use only certified cables and power supplies.
• 📉 Try not to discharge your phone below 15% in everyday use.
• ❄️ Don’t charge a cold phone brought from the street – let it warm up.

Regular firmware updates are also important. Xiaomi engineers are constantly improving the energy algorithms in new versions of MIUI. If you have a very old version of Android, the update can bring improvements to power drivers.