Why Xiaomi is fast discharged after the update: analysis of the causes and solutions

You upgraded your Xiaomi, Redmi or POCO firmware, and after a couple of days you noticed that the battery was running 2-3 times faster? The situation is familiar to many: after installing a new version of MIUI or Android, a smartphone that used to hold a charge for a day now requires recharging by the evening. What is it - battery failure, firmware error or hidden settings?

In 80% of cases, the problem is not physical battery wear, but software conflicts after an upgrade. The manufacturer rarely admits such bugs openly, but they can be diagnosed and fixed independently. In this article, we will discuss 7 key causes of accelerated discharge, including hidden processes, MIUI optimization errors and incorrect default settings.

Warning: Some methods require a superuser rights (root) or a rollback to a previous firmware version. If you are not ready for experiments, focus on the safe ways in the first three sections.

1. Misoptimization of MIUI after the update

With each new version of MIUI (especially after major updates like MIUI 14 → MIUI 15), Xiaomi makes changes to power management algorithms. Often these changes do not take into account the features of specific models, which makes the processor and communication modules work in suboptimal mode. For example, after upgrading to Android 13 on the Redmi Note 11, users massively complained about increased battery consumption due to the default Adaptive Connectivity mode, which constantly scans 5G networks even when the mobile Internet is turned off.

How it manifests itself:

• 🔋 Battery sits down at 10-15% per hour in standby mode (previously 1-2%).
• 📱 The phone warms up noticeably without load (especially in the upper part of the case).
• ⚡ In the battery consumption list, the Android System is the leader or MIUI Daemon.

The first thing you need to do is reset your optimization settings.

1. Go to Settings → Battery and Performance → Battery Settings
2. Slip on the three dots in the upper right corner and select Reset Battery Settings.
3. Confirm the action and restart the device.

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If battery consumption has not decreased after reset, check Adaptive Brightness settings in Settings → Display. In newer versions of MIUI, this feature often gets knocked down and makes the screen work at maximum brightness even in low light.

2. Conflicts with applications after the update

Updating the firmware may break compatibility with installed applications, especially if they:

• 🔄 Use background processes (messengers, fitness trackers).
• 📡 Work with geolocation or mobile data (maps, taxis, delivery).
• 🛠️ Optimized for the old version of Android (for example, banking applications 2020-2021).

The most voracious apps after the update are Facebook, Instagram, Google Maps and Mi Fit, which can consume up to 30% of the charge per day due to constant notification checks or caching errors, to identify the culprit:

1. Open Settings → Battery and Performance → Battery Use
2. Look at the flow chart for the last 24 hours.
3. If an app consumes >10%, limit its activity.

Settings → Applications → Application Management → [Select App] → Battery → Limit background activity

If the problem is in a system application (e.g., com.xiaomi.midrop or com.miui.analytics), it can be disabled via Settings → Apps → Show all applications, but this may disrupt some MIUI features.

3. kernel and driver errors after update

Major updates (such as Android 12 to Android 13) often bring new versions of the Linux kernel and hardware drivers. If the manufacturer hasn't tested them properly on your model, you may experience:

• 🔌 Current leaks in sleep mode (the phone discharges by 5-10% per night).
• 📶 Increased power consumption of the communication module (especially on budget models like Redmi) 9A or POCO M3).
• 🖥️ Incorrect operation of the processor (hangs at high frequencies).

You can check this with the CPU Monitor (Play Market) app, and if the processor does not go into deep sleep in standby mode, but is kept at frequencies > 500 MHz, the problem is in the kernel.

If you have your model in the table, try the solution. For the rest of the time, the only reliable way is to roll back on the previous firmware version or wait for a patch from Xiaomi.

4.Reset battery settings and cache

After the update, MIUI resets the internal power management settings, but does not always correctly recalculate consumption profiles for installed applications, which leads to the system continuing to reserve resources for old tasks that are no longer relevant.

To fix this:

Remove the app's cache Settings|Reset the battery settings in Settings → Battery → ⋮ → Drop it.|Turn off the Adaptive Battery in Performance Settings|Reboot the device and let it work 1-2 hours without recharging-->

If after these actions, the battery consumption remained high, try to clear the /data partition cache (does not delete user data):

1. Turn off the phone.


2. Press Power + Volume up to enter Recovery.




3. Select Wipe & Reset → Wipe Cache.




4. Confirm and restart.

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Recovery cache resets do not delete photos or apps, but can reset some settings (such as fingerprints or a pattern lock).

5. Problems with battery calibration

After updating the firmware, the battery controller may incorrectly determine its capacity, which is why:

• 🔋 The percentage of charge "jumps" (for example, from 30% immediately to 15%).
• ⚡ The phone turns off at 10-20% of the remaining charge.
• 📊 The discharge graph in the settings shows a nonlinear drop.

It's not a physical wear on the battery, it's a software calibration error to fix it.

1. Discharge the phone before automatically shutting down.
2. Connect the original RAM and charge up to 100% without interruptions.
3. Turn off charging and use your phone for 2-3 hours.
4. Repeat the discharge / charge cycle 1-2 times.

If the problem persists, check the battery status through the engineering menu:

#4636## → Battery → View Health Levels

Good means the battery is in good shape, and if it's Unknown or Replace soon, it's time to change the battery.

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For an accurate diagnosis, install Battery Guru (Play Market) and check the Battery Wear setting. If it is >30%, the battery is worn out and needs to be replaced.

6.The impact of new MIUI functions on autonomy

Xiaomi often adds “chips” in updates that look beautiful in presentations, but actually drain the battery. MIUI:

Disabling these features can bring back up to 20-30% of battery life, especially on low-end models with small batteries (e.g. Redmi A1 or POCO C40).

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If you don’t use Always-On Display (AOD), Turn it off in Settings → Lock screen: This feature can consume up to 5-7% of the charge per hour per day. AMOLED-screen.

7. When it's not firmware that's to blame: hardware causes

If all the software methods did not help, the problem may be:

• 🔋 Battery wear (more than 500 charging cycles).
• 🔌 Power controller malfunctions (often after falls or moisture infestation).
• 📱 Damage to the battery plume (typical for Xiaomi) 11T Redmi Note 11 Pro+).

Checking hardware faults can be as follows:

1. Connect your phone to charging and look at the charging speed in AccuBattery. If it jumps constantly (like 18W to 5W) – a controller problem.
2. Touch the body in the battery area. If it's swollen or too hot, the battery needs to be replaced.
3. Check if the charging connector is going away. If the phone only charges in a certain position of the cable, it's the USB-C connector.

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On models with a removable back cover (for example, Redmi 9A) you can independently check the mounting of the battery plume. On monolithic housings (for example, Xiaomi 13) for diagnosis will require a service center.

⚠️ Warning: If the battery is swelling, you can't keep using the phone! This could cause fire.

FAQ: Frequent questions about Xiaomi rank after update