Xiaomi Redmi Note 4X is a well-deserved budget legend, largely due to its phenomenal autonomy. However, time is inexorable, and even the most reliable lithium polymer battery degrades over time, losing its original capacity. If your phone starts to run out faster, turn off in the cold or at 20-30% charge, these are sure signs that the resource of the chemical element is coming to an end. Before you carry the device into service or buy a new battery, you need to conduct a competent diagnosis.
In this article, we will look at all the available ways to check the status of the battery, from built-in system utilities to third-party software. You will learn to distinguish between software calibration failures and real physical wear. Understanding the current state of the battery will help you make the right decision about replacing it or optimizing system settings.
Diagnostics through the MIUI Engineering Menu
The fastest and most reliable way to get the primary information about the condition of the components of the smartphone is using the built-in engineering menu. In the MIUI shell for the Redmi Note 4X (Snapdragon 625), an extended set of tests is available, which does not require root rights. To enter this mode, you just open the standard Phone application and type a special combination of characters.
Type ##6484## on the dial keyboard. The menu will open automatically, without the need to press the call button. Here you are interested in a item that may be called the Battery test or the Battery Test. When you click on it, you will see the current charge level, voltage and temperature. Notice the voltage setting: if it jumps or doesn't grow much when you connect the charge, the problem may be in the power controller or the plume itself.
The engineering menu also allows you to run an automatic discharge test, which will simulate the load, checking the battery's stress-stability, and if the smartphone suddenly turns off during the test, it indicates critical wear on the cells or a violation of contacts inside the battery.
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If the code ##6484## doesn't work, try an alternative for older versions of MIUI: ##4636##. It opens the testing menu where you can also find information about the battery.
Use of secret USSD codes and system logs
In addition to the engineering menu, Android has hidden stats sections that are accessible through specific commands. Redmi Note 4X has the code ##4636##. Once you enter it, select Battery Information, which displays more technical information, including health status and manufacturing technology.
In the Status section, you'll see the line "Battery status." The normal value is "Good." If it says "Overheat" or "Dead," the situation requires immediate intervention. You can also see the number of recharge cycles, although many Xiaomi stock firmwares may not update correctly without third-party utilities.
⚠️ Note: Do not try to reset battery usage statistics through commands ADB This can disrupt the calibration algorithms of the controller, and the charge indicator will start to show incorrect values.
Access to system logs is often required to get detailed information about charging cycles and current capacity. MIUI This is difficult to do, so users often resort to using it. ADB-The adb shell dumpsys battery gives the current status, but not the history of degradation.
List of useful codes for Redmi Note 4X
Analysis with third-party applications
When built-in tools are not enough, specialized applications from Google Play come to the rescue, and AccuBattery is the leader in this field, and it doesn't just show the current charge, it analyzes the rate of energy replenishment and discharge rate, calculating the actual capacity of the battery compared to the passport.
For the Redmi Note 4X, the standard capacity is 4100 mAh. After installing the AccuBattery, you need to use the phone for several days in normal mode, connecting the charger. The application will accumulate data and eventually show capacity. If the program shows 2500-3000 mAh, then the wear is about 30-40%, which is a reason for replacing.
Other useful utilities include Battery Charge Limit (to extend the life of a new battery) and CPU-Z. In the latest app, the Battery tab will show the technology (Li-Po), voltage and temperature. It is important to pay attention to the temperature: if it is above 35-40 degrees in a downtime, it may be a degradation process or the background process “eats” resources.
The temperature in the simple does not exceed 35 ° C.
The voltage at 100% charge is 4.20-4.35 V.
There are no sharp jumps in interest (for example, from 40% immediately to 15%).-->
Visual inspection and physical signs of wear
Software techniques are good, but the physical state of the Xiaomi Redmi Note 4X battery often says more than any number. Lithium polymer batteries tend to inflate when gases are released inside the sealed shell, due to chemical disruption or mechanical damage.
Carefully examine the back cover of the smartphone, if it began to move away from the body, there are gaps or the screen is slightly pushed out of the frame — this is a sign of battery bloating.
Also note the heating of the lower body (where the battery is located) during charging. If the phone is noticeably hot even when using the original charger, this is a signal of high internal resistance of the battery.
| Symptoms. | Probable cause | Decision |
|---|---|---|
| The phone is turned off at 20-30% | Critical wear, loss of capacity | Battery replacement |
| Back cover lifted. | Battery bloating (gas generation) | Urgent replacement, fire risk |
| Long charging (more than 4 hours) | Wear of the controller or the battery itself | Diagnostics of the power controller |
| Sharp charge jumps (50% -> 10%) | Cell imbalance | Calibration or substitution |
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A ballooning battery is not just an inconvenience, it's a direct safety hazard. Don't try to prick it or put it in the freezer, dispose of it immediately.
Capacity and charging cycles Redmi Note 4X
Understanding the specifications helps to objectively assess the condition of the device. The Redmi Note 4X model is equipped with a non-removable battery of the Li-Polymer type with a typical capacity of 4100 mAh (minimum 4000 mAh), the nominal voltage is 3.85 V, and the charging is 4.4 V.
Manufacturers claim that the battery retains up to 80% of its capacity after 500 full charge cycles. A full cycle is the sum of discharges equal to 100% (for example, twice 50%). If your phone is over 3-4 years old and you have charged it daily, it has already gone through more than 1000 cycles, which means significant degradation.
When buying a new battery, pay attention to the labeling. Xiaomi's original batteries have a hologram and QR-Chinese copies often have real capacity. 2000-2500 mAh, which will be immediately noticeable after installation.
How to extend the life of a new battery?
Battery calibration: myths and reality
Often users confuse physical wear with a software failure of the controller, which incorrectly shows percentages. In this case, calibration helps. The essence of the method is to completely discharge the device before turning off, followed by charging up to 100% when turned off.
The procedure for the Redmi Note 4X is to discharge the phone before it auto-turns off. Turn it on and make sure it switches off again (if it's on, discharge further). Connect the original charger to the phone off and hold it to 100%. Then you can turn on the device. If the indicator is 100%, calibration is done.
It's important to understand that calibration doesn't restore the chemical capacity. If the battery is physically worn out, no amount of diamond dancing will make it hold the charge longer. It just synchronizes the screen readings with the actual voltage level at the terminals.