Why the battery on the Xiaomi smartphone is quickly discharged: a full analysis of the causes and solutions

Have you noticed that your Xiaomi runs out in half a day, even though it used to hold a charge for a day? Or does the phone suddenly shut down at 20-30% charge, even though the indicator showed normal levels? Rapid battery discharge is one of the most common problems for owners of Redmi, POCO and Mi smartphones, but the reasons can be very different from software failures to physical wear of the battery.

In this article, we’ll look at all the possible reasons why Xiaomi’s battery is going down too fast, from the obvious (background apps, bright screen) to the hidden (power controller malfunction, firmware errors), how to diagnose a problem with built-in MIUI tools, what settings to optimize, and when to bring your phone to service. And also why even new Xiaomi smartphones can discharge in 4-5 hours when used actively, and how to fix it without losing functionality.

Background processes and “gluttonous” applications

The most common cause of fast discharge is applications that run in the background, and even if you don't use social media or instant messengers, they can constantly sync data, update content and charge, especially when you're not using social media or instant messengers.

• 📱 Social networks (Facebook, Instagram, TikTok) – they often update the feed and send notifications.
• 💬 Messengers (WhatsApp, Telegram, Viber) – even in the “sleep” mode they support a connection with servers.
• 🎮 Games – many mobile games (such as Genshin Impact or PUBG Mobile continues to consume resources even after closing.
• 📍 Geolocation Services – Google Maps, Yandex.Maps or Uber may include GPS background.

To check which applications use up the most power, go to Settings → Battery → Battery Use. Here you will see a list of programs with percentage consumption. If an application consumes more than 10-15% of its charge in a few hours, you need to limit it.

⚠️ Note: Some system processes (e.g., Android System or MIUI Daemon) may be high in consumption, and if they consume more than 20%, it's a sign of a firmware failure or a virus.

2. MIUI Optimization: Hidden Settings That Kill the Battery

MIUI is known for its "chips," but some of them steal charge in the background. Here are the key settings worth checking:

• 🔍 Auto Sync: Disable it for unnecessary accounts in Settings → Accounts and synchronization.
• 📡 Continuous search Wi-Fi/Bluetooth: B Settings → Connections → Additionally, disable the options "Search for Wi-Fi networks in the background" and "Search for Bluetooth devices".
• 🔄 Auto Update Apps: Go to Settings on Google Play → Auto-Update Apps and select “Wi-Fi Only” or “Do not automatically update".
• 🌐 Mobile data roaming: If you travel frequently, turn off background mobile internet use for apps in Settings → SIM-maps and mobile networks → Transfer of data.

Another feature of MIUI is Smart Optimization (formerly Lean), which is supposed to save power, but sometimes works exactly the opposite.

1. Go to Settings → Battery → Battery settings.
2. Turn off the Smart Optimization option (or the Adaptive Battery option in newer versions).
3. Enable manual optimization mode for critical applications.

3. Screen: brightness, refresh rate and always on display

The screen is the main consumer of energy in any smartphone. Xiaomi has several options that can significantly reduce the time of operation:

• ☀️ Automatic brightness: Seems convenient, but the light sensor often overstates the brightness. 40-60%.
• 🔄 Screen refresh rate: Models with AMOLED-displays (e.g. Xiaomi 13 or X-rays) POCO F5) Support 120Hz. Switch to 60Hz in Settings → Display. → Frequency of update.
• 🌙 Dark subject: On AMOLED-It really saves the charge on screens (up to the time) 15-20% active-use).
• 🕒 Always On Display (AOD): Constantly burning hours or notifications on the lock screen are eaten up to 5-7% Charge per hour. Turn it off in Settings. → Screen locking → Always On Display.

Professional life hack: if you have Xiaomi with AMOLED-display, turn on the reading mode (Settings) → Display. → Reading mode: Not only does it reduce eye strain, it also reduces energy consumption by filtering blue light.

4.Mobile Internet and Wi-Fi: How the network affects the battery

An unstable Internet connection is a hidden battery killer, and when the signal is weak, the smartphone spends more energy searching the network and retransmitting data.

• 📶 Switch to the switch. 4G instead 5G: If you do not need a high-speed Internet, then the → SIM-maps and mobile networks → Type of network, select 4G (LTE). 5G spend 20-30% charge-up.
• 🔄 Turn off automatic network search: C Settings → Mobile network → Auto Search Network Select Manual Mode.
• 📡 Use Wi-Fi instead of mobile data: Wi-Fi connection is less energy-consuming than mobile data 3G/4G.
• ⚡ Airplane mode in the zone of bad signal: If you are in the subway or outback, where the connection is constantly broken, turn on the mode of the aircraft - this will save up to 10% of charge per hour.

Also check if the option "Mobile Data is Always Active" (in some MIUI firmware it is hidden in the developer) is enabled to disable it:

1. Activate Developer Mode (7 times click on Settings → About Phone → MIUI version).
2. Go to Settings → Additional → For developers.
3. Find the option “Mobile data is always active” and turn it off.

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If you travel frequently, create a Plane Mode widget on the home screen, which will allow you to quickly turn it on the subway or plane without digging into the settings.

5. Battery wear: how to check and what to do

Any battery degrades over time. On average, Xiaomi loses 20-30% of its capacity in 2-3 years of active use. If your smartphone is older than that age, the problem may be physical wear and tear.

To check the status of the battery:

1. Enter the phone app code ##4636##.
2. Go to the tab "Battery Information".
3. Look for the "Battery health" option, and if it's over 30-40%, you should change the battery.

You can also use apps like AccuBattery (available on Google Play) that show real battery capacity and discharge rate.

⚠️ Warning: If the battery is swelling (the phone body is bulging) - immediately turn off the device and do not use it until the battery is replaced.

6. Viruses, advertising and malware

If the battery suddenly starts to run out and unknown processes appear on the consumption list – perhaps a virus or advertising software on the phone, this is especially true if you installed applications from third-party sources (not from Google Play).

Signs of infection:

• 📱 Unknown applications in the list of installed programs.
• 🔋 Quick discharge even in standby mode.
• 📈 Increased mobile data traffic.
• 🚫 Pop-up ads in unexpected places (even on the lock screen).

What to do:

1. Install an antivirus (such as Malwarebytes or Kaspersky Mobile) and scan the device.
2. Check the list of installed apps in Settings → Apps → App management. Remove suspicious ones.
3. Disable installation from unknown sources in Settings → Privacy → Special permissions → Install unknown applications.
4. If nothing helps, reset to factory settings (don’t forget to back up!).

Important: Some viruses disguise themselves as system processes (e.g. com.android.system), and if you're not sure, you should consult a specialist.

7. firmware errors and crashes after the update

Sometimes a quick discharge starts after the MIUI update.

• 🐞 Bug in the new firmware version (especially relevant for betta versions).
• 🔄 Incorrect kernel optimization (for example, after upgrading to the MIUI 14 Some users complained about increased charge consumption).
• 📦 Custom settings conflict (if you have changed themes, fonts or use Magisk).

How to fix it:

1. Check if a new update has come out. Often Xiaomi releases patches to fix battery bugs.
2. Reset the settings to factory (without deleting data): Settings → About phone → Reset settings.
3. If the problem has occurred after a major update (for example, from MIUI 13 to MIUI 14), you can try to roll back to the previous version using the Mi Flash Tool (for power users only!).

Also worth checking is the performance mode. Sometimes, after the upgrade, it is reset to "Maximum Performance", which increases the charge consumption. Switch to "Balanced" or "Energy Saving" in Settings → Battery → Performance modes.

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If the battery starts to run out immediately after the upgrade, try resetting the settings first (without deleting the data), which solves the problem in 70% of cases.

8 Hardware Problems: What Breaks in Xiaomi

If all the software methods have been tried and the battery still runs out in a few hours, the problem could be the hardware.

• 🔌 Faulty power controller: Responsible for power distribution. When the phone breaks, it can run out even when it's off.
• 🔋 Bloating or short circuit in the battery: Leads to a sharp drop in the capacity and overheating.
• 📶 Problems with antenna module: If a phone is constantly losing network, it spends a lot of energy searching for a signal.
• 🔌 Unoriginal or damaged charging port: May cause unstable charging and increased consumption.

How to diagnose:

• Check if the phone is warming in the battery or processor area (you can use the AIDA64 app to monitor the temperature).
• Connect your phone to charging – if it’s not charging or charging is jerking, the problem may be in the port or cable.
• See if the phone is switched off at 20-30% charge (a sign of battery wear or controller failure).

If you suspect a hardware malfunction, don’t try to repair the phone yourself (especially if it’s warranty-free).

⚠️ If the phone stopped turning on after full discharge - do not try to "reanimate" it by connecting to charging on the phone. 5 In some cases, it can short circuit. It's better to leave it on the charger. 30-60 minutes and then try to turn on.

FAQ: Frequent questions about Xiaomi battery