Why the battery is quickly discharged on Xiaomi Redmi Note 7: full analysis

Owners of the popular smartphone Redmi Note 7 often face a situation when the once hardy device begins to discharge literally before our eyes. This model, released in early 2019, was originally famous for excellent optimization and a capacious battery of 4000 mAh. However, time does not spare anyone, and after a few years of active use, autonomy can decline to critical values.

The reasons for the sudden drop in charge can be many: from the natural physical wear of Li-Ion cells to software failures in the shell of MIUI. Sometimes the user himself, unwittingly, adjusts the system so that energy is wasted. It is important not to panic, but to consistently analyze the state of the gadget. In this article, we will analyze in detail all possible factors affecting power consumption, and propose specific methods for solving the problem.

Before you carry your phone to the service center, you should conduct an independent diagnosis. It often happens that the "problem" battery is quite good, and it is only a matter of background process or downed screen settings. Understanding the principles of the Android operating system in conjunction with the proprietary firmware will help you significantly extend the time of the device without recharging.

Natural wear and physical condition of the battery

Any chemical current source has a limited resource of charging and discharging cycles. If your Redmi Note 7 is a few years old, reducing capacity is a normal physical process. Lithium-ion batteries degrade even when stored, but active use, especially in high temperatures, accelerates this process. Chemical degradation causes the battery to physically not be able to store the amount of energy that was claimed during production.

In addition to age, the nature of operation also affects the condition: frequent full discharges to zero or, conversely, a long stay on charging after reaching 100% negatively affect the life of the cells.

⚠️ Warning: If the back cover of the smartphone starts to swell or the screen rises, immediately stop using the device.

We can test the wear by software, although it does give approximate results. MIUI Or third-party snails can show the current residual capacity, if the wear exceeds the wear and tear. 20-25%, no software settings will not return the former autonomy, and only the replacement of the power supply will help.

Impact of screen settings and MIUI system

The display is one of the main energy consumers in any smartphone, and the Redmi Note 7 is no exception. The brightness, resolution and refresh rate of the picture directly affect the discharge rate. In the shell of MIUI, there are many visual effects that are pleasing to the eye, but ruthlessly eat up charge. Turning off transition animations and live wallpaper can give an increase in autonomy of up to 10-15%.

Special attention should be paid to the Always On Display and the lifting of the screen when you pick up. These features use sensors and a part of the matrix in the background, which creates a constant load. If you are not critical to see the time on the off screen, you should turn off these options in the Settings → Lock screen.

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Use a dark theme of design. IPS-The Redmi Note 7 screen does not have the same effect as the AMOLED, But it reduces the brightness of the white background, which in the sum of a day saves a noticeable amount of energy.

Also check the screen timeout settings. If the screen goes out after 2 or 5 minutes of downtime, you lose a lot of energy. The optimal value is 30 seconds. In addition, the vibration when typing and touching creates mechanical stress, which also requires battery power.

Background processes and “gluttonous” applications

Often, the culprits of fast discharge are apps you don't even use at the moment. Social media, messengers and news aggregators are all looking to keep content up to date in the background. MIUI has a powerful control tool, but it may not be hard enough by default. Go to the battery statistics to see the list of consumption leaders.

Apps with poor code optimization are particularly dangerous, and they can create wakelock loops that keep the processor from going into deep sleep, which keeps the phone warm in your pocket and discharges even if you're not using it, and removing or limiting these programs is a key step to solving the problem.

It is recommended to manually configure the energy saving strategy for each heavy application. The system allows you to choose the mode "No restrictions", "Smart restriction" or "Strict restriction". For instant messaging, it is better to leave "Smart restriction" for instant messaging, and for games and video players you can put "Strict restriction" if notifications from them are not needed in the background.

⚠️ Warning: Do not install the dubious "memory cleaners" and "battery accelerators" from the Play Market. These are themselves background processes that consume resources and often contain aggressive advertising.

Problems with network module and geolocation

Networking is one of the most energy-intensive processes for a smartphone. If you're in a zone of uncertain reception (countryside, basement, subway), the Redmi Note 7 modem starts running at the power limit, constantly trying to find the base station, which leads to high heat and rapid discharge, in such situations, it is better to temporarily turn on the air mode.

Geolocation services (GPS, GLONASS, Galileo) also require significant energy. Many applications request location access all the time, even when not in use. Check access settings: for most programs, "Only in Use" is enough. Accurate satellite positioning can be replaced by Wi-Fi and mobile networking, which is less expensive.

Bluetooth and NFC technologies, if not used continuously (e.g. for a fitness bracelet or payment), are best kept off. Constant scanning of the environment to find devices puts extra strain on the power controller. In MIUI, it is convenient to control these switches through the notification curtain.

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Weak signal of cellular communication is the main enemy of autonomy. In the area of 1-2 divisions of the network, the smartphone discharges 2-3 times faster than in the zone of confident reception.

Battery calibration and software failures

Sometimes the problem is not physical wear, but it's the power controller and the operating system that are out of sync, and the phone can turn off 15 percent abruptly, or get stuck 99 percent, and the calibration procedure helps, and it allows the system to learn how to read the charge level correctly.

To perform the calibration, you need to completely discharge the device before spontaneously turning off. Then, without turning on the screen, put the phone on charge to 100%. After reaching full charge, hold it on the charger for another 1-2 hours. Then perform a forced reboot (pressing the power button for 10-15 seconds).

adb shell dumpsys batterystats --reset

This command resets battery usage statistics through ADB (Android Debug Bridge), which can help if the problem is caused by software accumulation of errors in the system logs, but it is only worth using this method for experienced users who understand the risks of working with debugging.

Diagnostics and checks of battery health

Before drastic measures are taken, accurate data on the status of the battery is needed. - Redmi Note 7 There's a hidden engineering menu that allows you to do technical information ##6485##. In the list you open, find the parameter. MB_06 (battery status; and MF_02 (charge-cycle).

If the parameter MB_06 It says "Good," so the controller thinks the battery is in good shape, but it doesn't always reflect the actual capacity (MF_02) More informative: the life of modern batteries is about 500-800 If the meter shows the full cycles, 800+, Physical wear is likely to be great even if the phone is working.

For a deeper analysis, third-party applications such as AccuBattery or Ampere can be used. They take time (multiple charge-discharge cycles) to accumulate statistics, but show the real current capacity in mAh. If the capacity has fallen below 2500-2800 mAh (at the factory 4000 mAh), a replacement is inevitable.

To sum up, extending the life of the Redmi Note 7 is a set of measures: Start with the screen setting and background processes, check the wear through the engineering menu and replace the battery if necessary. Proper operation will allow your device to serve as faith and truth for a long time.