Owners of the popular Xiaomi Redmi 8 budget smartphone often face sudden and unexplained discharge of the device. The device, which originally could have been running for two days on a single charge, begins to require recharging by lunch. This is not always a sign of failure of the battery itself; in 80% of cases, the problem lies in software failures of MIUI or improper operation.
Analysis of service center data shows that the main cause of rapid discharge is application background activity and operating system errors. Users often do not notice how installed programs continue to consume resources even after closing. Deep discharge also negatively affects the power controller, which leads to incorrect display of percentages of charge.
In this article, we will take a closer look at all the possible reasons why the Xiaomi Redmi 8 battery is going down quickly, and provide step-by-step troubleshooting instructions. We will look at both software solutions and hardware aspects that need to be considered when diagnosing.
The main reasons for the rapid discharge of the battery
The first thing to do when you find a problem is to understand the nature of the problem. Physical wear and tear of lithium polymer batteries is a natural process, but on the recent Redmi 8, it's rarely the main cause in the first two years of use, and it's often the screen settings and networking modules that are the most to blame.
The screen is the most energy-intensive component of a smartphone. High backlight brightness and long periods before going to sleep can eat up to 40% of the charge per day. When combined with the NFC module turned on or the constant search for the GPS network, the energy consumption becomes critical.
- 📱 High brightness of the display and lack of auto-extinguishing.
- 📡 Constant search for a cellular signal in the area of poor coverage.
- 🔋 Background data synchronization and geolocation.
Also worth paying attention to the ambient temperature: Using the gadget in the cold or in direct sunlight causes a chemical reaction inside the battery, which temporarily reduces its capacity. A critical drop in voltage in the cold can lead to a sudden shutdown of the device at 15-20% charge.
Another important factor is the state of the battery itself: charge-discharge cycles gradually reduce real capacity. If your Xiaomi Redmi 8 is over two years old and has been on a constant fast charge, the degradation of chemical composition could reach 20-25%.
Diagnostics through MIUI settings
The MIUI Operating Shell provides powerful tools to monitor power consumption. To find the battery eater, go to Settings → Battery and Performance, and here you will see a graph of energy consumption over the past 24 hours or week.
Notice the apps that are at the top of the list, if there's a messenger or a social network, that's fine. However, if you see an unknown system application or game that you haven't used, that's a signal of a failure. MIUI allows you to limit the background activity of those programs.
⚠️ Warning: If you see Media Services or Google Play Services on the consumption leaderboard, it may indicate a stalled update or sync process.
For more details, you can turn on Developer Mode. Go to Settings → About Phone and click on MIUI seven times. Then, in the Advanced Settings menu, select Developer Mode and find Battery Usage Statistics, which is presented in a more raw but accurate way.
Remember that some features, such as “Lift to Turn on Screen” or “Adaptive Brightness”, may not work properly due to a failure of proximity sensors. Disabling these options in the Settings → Lock screen section often helps save several percent of charge.
Problem applications and background processes
One of the most common reasons why the Xiaomi Redmi 8 battery goes down quickly is because of unoptimized apps, which developers often embed in their code ad modules and trackers that are constantly active, and even if you don’t use the app, it can mine cryptocurrency or send data.
Social media and instant messengers are particularly important, and apps like Facebook and Instagram are known for their aggressive resource consumption, they constantly update their feeds, upload media and track their location, and MIUI has a Battery feature that allows you to customize the behavior of each app separately.
It is recommended to check the permission list. Go to Settings → Applications → Permissions. Disable geolocation and microphone access for programs that do not need it for basic functionality. This will not only save charge, but also increase your privacy.
☑️ Verification of background applications
There's also the concept of wakelocks, which are processes that keep the phone from going to deep sleep, and if the phone is on the table and it's warming up, even though the screen is off, then some app is holding the wakelock. You can use third-party tools to combat this, but Xiaomi often has a standard limiter.
Impact of network modules and communication
Networking is one of the most energy-intensive processes for any smartphone, and if you're in a zone of insecure reception (countryside, basement, subway), the Redmi 8 communications module is running at its limit, constantly increasing the power of the transmitter, which leads to a rapid discharge and heating of the case.
Using 4G/LTE mobile internet also consumes more power than Wi-Fi. If you are constantly moving between different towers (for example, in transport), the phone constantly switches between frequencies, which is very expensive.
Bluetooth module and geolocation GPS They have to be turned off if you're not using them right now, and many apps request access to the location of "Always" instead of "Only in use." GPS-The model works in the background, even when the phone is in your pocket.
| Communication module | Level of flow | Recommendation |
|---|---|---|
| Mobile Internet (4G) | High-pitched | Use Wi-Fi wherever possible |
| GPS/Geolocation | Very tall. | Disconnect when not in use |
| Bluetooth | Medium. | Turn off if the clock is not connected |
| Wi-Fi | Low/Mediocre | Preferably a mobile network |
How to find an app that uses GPS in the background?
System Errors and Firmware Update
Software bugs in the MIUI shell can cause a CPU to “circulously wake up” when the system service tries to complete a task, gets an error, and immediately tries to perform it again, cycles that can last for hours, undetectable to the user, discharging the Xiaomi Redmi 8.
Often, the problem is solved by updating the system. Xiaomi developers regularly release patches that fix power errors. Check for updates in the Settings menu → About Phone → MIUI version. If the automatic update does not offer a new version, you can manually check it through three dots in the corner of the screen.
However, sometimes it is a fresh update that causes the battery to start to go down quickly after the update, and it takes 2 to 5 days for the system to optimize the files and re-index, during which time the phone can warm up and discharge quickly, which is normal.
If the problem persists for more than a week after the update, it is recommended to reset the settings. Important: before doing this, make sure to back up the data to the cloud or to your computer, as all files will be deleted.
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After a major MIUI update, leave your phone connected to charging and Wi-Fi overnight with the screen off.The system will perform background optimization of apps, which will improve autonomy in the future.
Hardware malfunctions and battery wear
If the software didn't work, you'd have to think about the physical state of the battery. 500-800 They're full charge cycles, and then their capacity drops below that. 80% from the face value, and the phone begins to discharge in front of the eyes.
Signs of needing to replace the battery:
- 📉 The phone turns off when 10-20% charge.
- 🔥 The device is very warm in the area of the camera even in simple.
- ⚡ Charging occurs nonlinearly (fast to 80%, then very slowly).
It is also worth checking the Micro-USB charging connector (or USB-C, depending on the region modification, although Redmi 8 is more likely to have Type-C). A loose port can cause poor contact, causing the power controller to misread current data, leading to percentage jumps in charge.
⚠️ Attention: Bloated battery is dangerous! If the back cover of the smartphone starts to move away or the screen rises, immediately stop using the device and replace the battery.
You can use an engineering menu to accurately diagnose the battery condition ##6485## You're interested in the parameters. MB_06 (battery-state: Good/Bad) and MF_05 (real residual capacity in mAh if the capacity is significantly lower 4000-5000 mAh (claimed for Redmi) 8), replacement is inevitable.
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If the code of the engineering menu shows the status of "Bad" or a capacity below 3000 mAh, the software methods will not help - a physical replacement of the battery is required.
Calibration and optimization methods
Sometimes the battery controller forgets the actual capacity limits, and this is manifested in percentage surges (30 percent, 5 percent), in which case calibration helps, the method is to completely discharge the phone before turning off, followed by charging to 100 percent when off.
Calibration process on Xiaomi Redmi 8:
- Discharge the phone until it is completely turned off.
- Put on charging in the off state to 100%.
- Keep on charging for another 1-2 hours after reaching 100%.
- Turn on the phone without turning off the cable and make sure the indicator shows 100%.
To extend the life of the battery in everyday use, it is recommended to adhere to the rule of "20-80%." Do not discharge the phone to zero and do not keep constantly on charging. Using an original or certified charger is also critical for the health of the power controller.
In the MIUI battery settings, turn on the “Energy Saving” or “Ultra-Energy Saving” mode if you have a long day without an outlet. These modes limit the processor frequency and turn off background processes, significantly extending the life of the device.