Xiaomi Redmi Note 8 Pro with its powerful processor Helio G90T and a capacious battery for 4500 mAh Should easily last a day of heavy use. But many owners are faced with a situation where the charge melts before their eyes: from 100% to 0% in 3-4 hours, and in standby mode the phone loses 20-30% overnight. If your Redmi Note 8 Pro began to discharge like the old one iPhone 6, do not rush to blame the battery - in 80% of cases the problem is software.

In this article we will look at all possible reasons fast discharge - from background processes to hardware faults, and we will also give step by step instructions to diagnose and fix the problem. We will pay special attention hidden MIUI settings that eat up battery in the background and are almost never mentioned in standard guides. You will learn how to disable unnecessary services, optimize processor performance, and even restore battery capacity if it has degraded.

1. Diagnostics: how to understand what exactly is draining your phone

Before rushing into battle with the settings, you need to identify the “culprit” of high power consumption. B MIUI There are built-in tools for this, but they are often hidden or show data incorrectly. Here's how to spend accurate diagnosis:

Open Settings → Battery and Performance → Battery Usage. Here you will see a discharge graph and a list of applications consuming charge. Please note:

  • 🔋 Screen - if it takes up more than 40% of the flow rate, the problem is in brightness or activity time.
  • 📡 Mobile network/Wi-Fi — high flow rate (more than 15%) indicates a poor signal or background activity.
  • 🤖 System processes (Android System, MIUI Daemon) - their consumption should not exceed 10-12%.
  • 🎮 Games and instant messengers — if they hang in the background, they can eat up to 20% of the charge.

If there is no clear leader in the list, but the phone is discharged within a few hours, the problem may be hardware (battery wear, power controller malfunction) or MIUI hidden settings, which we will talk about next.

📊 What most often drains your Redmi Note 8 Pro?
  • Screen
  • Mobile Internet
  • Social networks (VK, Telegram)
  • Games (PUBG, Genshin Impact)
  • I don’t know, it discharges on its own

2. Software reasons: MIUI settings that kill the battery

MIUI - one of the most “gluttonous” Android shells, and in Redmi Note 8 Pro this is especially noticeable. Even after a factory reset, the system may consume up to 30% battery in the background. Here are the key settings you need be sure to check:

2.1. Autostart and background activity of applications

Default MIUI Allows most applications to run in the background and start automatically. This even applies to programs you don't use. To disable:

  1. Go to Settings → Applications → Manage applications.
  2. Select an application (eg Facebook or AliExpress) → Permissions → Autorun → Disable.
  3. Go back and click Background restrictions → select Limit background activity.

2.2. Battery optimization for system applications

Many users do not know that MIUI system processes (For example, Mi Push Service or Security) can also be limited. To do this:

  • 🔧 Go to Settings → Battery and performance → Manage battery consumption by apps.
  • 🔍 Find it in the list MiuiDaemon, MiPush, Security and other system services.
  • ⚡ Choose a mode for them Limit background activity or Energy saving.

⚠️ Attention: Shutdown Mi Push Service will stop notifications from Xiaomi (for example, about system updates). If this is critical for you, leave it in mode Intelligent Energy Saving.

Disable autorun of unnecessary applications|

Limit background activity of messengers|

Put system services into power saving mode|

Disable automatic account synchronization -->

2.3. Hidden MIUI features that eat up battery

B Redmi Note 8 Pro there are several non-obvious functionsthat actively consume energy:

  • 📡 Dual connection to Wi-Fi and mobile network (Settings → SIM cards and mobile networks → Dual connection) - disable if not used.
  • 🔄 Automatic download of updates (Settings → About phone → System update → Settings (⚙) → Auto download) — select Only via Wi-Fi or turn it off.
  • 🎧 Constantly searching for Bluetooth devices (Settings → Bluetooth → Search for devices)—disable if you are not using wireless headphones.
  • 📍 High geolocation accuracy (Settings → Privacy → Permissions → Geodata → Accuracy mode) — select Battery Saving.

3. Hardware reasons: when the battery or hardware is to blame

If after optimizing the software the problem remains, the issue may be physical wear and tear of the battery or component failure. Redmi Note 8 Pro with battery 4500 mAh after 2-3 years of operation it loses up to 30% of its capacity. Here's how to check it:

3.1. How to find out the actual battery wear

B MIUI There is no built-in tool to check battery health, but there are workarounds:

  1. Install the application AccuBattery (available in Google Play).
  2. Charge your phone to 100% and use it until it is completely discharged (before turning it off).
  3. In the section Health the application will show real capacity batteries. If it's lower 3500 mAh, the battery is critically worn out.

An alternative way is to use engineering menu:

*#*#4636#*#*

In the section Battery information look at the parameter Charge level (must match what is displayed on the screen) and Health status (if any). If the data differs greatly, the battery needs to be replaced.

3.2. Symptoms of a faulty power controller

If the battery is fine, but the phone is draining unevenly (for example, from 100% to 80% in 10 minutes, and then slowly), the problem may be power controller. Other symptoms:

  • 🔌 The phone does not charge from some chargers.
  • 🔥 The case gets very hot in the processor area even without load.
  • ⚡ The charge percentage “jumps” (for example, from 50% to 20% at once).
  • 🛑 The phone turns off at 20-30% charge, although it should work until 0%.

⚠️ Attention: If you notice Battery swelling (the phone body has become convex, the screen is “moving away”), stop using the device immediately - this is dangerous for health! This battery cannot be charged or disassembled by yourself.

4. CPU and graphics optimization to save battery

Redmi Note 8 Pro equipped with a powerful chipset MediaTek Helio G90T, which in maximum load mode can consume up to 6-8 W. Even when idle, the processor often runs at high frequencies due to background tasks. Here's how to fix it:

4.1. Setting Performance Mode

B MIUI There are hidden options to limit CPU power:

  1. Activate developer mode: go to Settings → About phone and press 7 times MIUI version.
  2. Return to Settings → Advanced → For Developers.
  3. Find the option Background limitation and install Limit to 2 processes.
  4. In the section Processor select Limit background activity.

4.2. Disabling unnecessary processor cores

Helio G90T has 8 cores, but only 2-4 are used in everyday tasks. You can disable extra cores to save power (required root rights):

  • 📱 Install the application Kernel Adiutor (required Magisk).
  • 🔧 Go to the section CPU → CPU Hotplug.
  • ⚡ Disable kernels CPU 4-7 (keep active only CPU 0-3 for everyday tasks).

⚠️ Attention: Disabling processor cores may result in freezing in games or when multitasking. Use this method only if you are confident in your actions.

💡

If, after optimizing the processor, the phone begins to slow down, return the settings to their original state and try instead limiting background processes through Settings → Battery → Power saving mode

5. Charging problems: why the phone won’t hold a charge

Sometimes Redmi Note 8 Pro discharges quickly not because of high consumption, but because not charging correctly. Here are the typical reasons:

Problem Signs Solution
Non-original cable/charging The phone charges slowly (less than 1% per minute), gets warm Use original charger 18W or certified USB-C with support Quick Charge 3.0
The port is dirty USB-C Charging is interrupted, the phone does not recognize the cable Clean the port with a wooden toothpick (gently!) or compressed air
Charge controller damaged The phone only charges when turned off or using a specific cable Controller replacement required (contact service)
Charging module firmware failure Charging is jerky, charge percentage fluctuates Reset your phone to factory settings or reflash your phone

If the phone does not charge to 100% (for example, stops at 80-90%), this may be due to:

  • 🔋 Battery calibration — perform a full discharge/charge cycle (from 0% to 100% without breaks).
  • 📉 Battery wear - if the actual capacity is below 3000 mAh, replace the battery.
  • 🛠 Controller failure - service diagnostics required.

6. Radical methods: when all else fails

If you have tried all the methods, but Redmi Note 8 Pro still discharges in a few hours, remains radical measures:

6.1. Full reset to factory settings

Sometimes the problem lies in accumulated system errors, which cannot be eliminated by conventional methods. To reset your phone:

  1. Back up your data (Settings → Advanced → Backup and reset).
  2. Go to Settings → About phone → Reset settings.
  3. Select Erase all data and confirm the action.

After reset do not restore data from backup — reinstall the applications and check the battery life. If the problem went away, the software was at fault.

6.2. Flashing the phone

If the reset doesn't help, try flashing the phone to pure android (For example, LineageOS) or stable version of MIUI:

  • 📥 Download the firmware from the official website Xiaomi (link).
  • 🔧 Install Mi Flash Tool on PC.
  • 📱 Put your phone into Fastboot (press Power + Volume Down).
  • 🖥Connect to PC and flash via Mi Flash Tool.

⚠️ Attention: Flashing erases all data and can lead to briku (breaking) the phone if you do something wrong. If you are not sure, contact the service.

What should I do if my phone does not turn on after flashing the firmware?

If after the firmware Redmi Note 8 Pro does not turn on (black screen, vibration without image), try:

1. Clamp Power + Volume Up for 10-15 seconds (hard reset).

2. Repeat the firmware via Mi Flash Tool with option Clean All.

3. If it doesn’t help, take it to a service center (the memory may be damaged eMMC).

7. Alternative solutions: external batteries and careful operation

If you're not willing to spend money on a battery replacement or repair, but your phone is draining too quickly, consider these options:

  • 🔋 External battery (power bank) - choose models with Quick Charge 3.0 (For example, Xiaomi Power Bank 3 Pro 20000mAh).
  • 🔌 Charging cases - for example, Xiaomi Mi Wireless Car Charger (supports wireless charging).
  • ☀️ Solar panels — suitable for hiking (for example, Anker PowerPort Solar).
  • ⚡ Portable chargers — Baseus 65W GaN (compact and powerful).

Also follow the rules careful operationto extend battery life:

  • 🔌 Do not leave your phone on charge overnight (optimally - 80-90%).
  • 🌡 Avoid overheating (do not play games while charging).
  • 🔋 Once every 3 months, perform full discharge/charge cycle (0% → 100%).
  • 🛠 Do not use cheap cables and chargers.
💡

If the battery Redmi Note 8 Pro worn out (capacity below 3000 mAh), an external battery is the only budget way to extend battery life without repair.

FAQ: Frequently asked questions about discharge Redmi Note 8 Pro

❓ Why does my phone run out of power even when it’s turned off?

This may be due to:

  • 🔋 Power controller malfunction (the phone consumes power even when turned off).
  • 📱 Firmware glitch (for example, after an unsuccessful update).
  • 🔌 Short circuit on the board (diagnostics required in the service).

Try removing the SIM card and memory card, then turn off the phone for 12 hours. If the discharge continues, take it in for repair.

❓ How to check if the battery installed in your phone is fake?

Signs of a fake battery:

  • 🏷 Missing hologram or serial number Xiaomi.
  • 🔋 The capacity on the label does not match the real one (checked through AccuBattery).
  • 🛠 The phone stops holding a charge 1-2 months after replacement.
  • 🔥 The battery gets very hot when charging.

Original battery for Redmi Note 8 Pro has an article number MB-J11B and capacity 4500 mAh.

❓ Is it possible to replace the battery yourself?

Technically yes, but:

  • ⚠️ Risk of damage to cables or boards (especially for beginners).
  • 🔧Tools required: suction cup, plastic pick, T3 screwdriver.
  • 📄 Guarantee Xiaomi will be lost (if it was still active).

If you dare, use original battery and be careful not to damage flexible display cable.

❓ Why did my phone start to discharge faster after the MIUI update?

This is a typical problem MIUI. Reasons:

  • 📱 New background services (For example, Mi AI or Game Turbo).
  • 🔄 Optimization for new models (firmware may not be adapted for Redmi Note 8 Pro).
  • 🐛 Bugs in the firmware (for example, constant activity Android System).

Solution: roll back to the previous version MIUI or wait for the patch (usually released 1-2 weeks after a major update).

❓ What is the battery life of Redmi Note 8 Pro?

When used carefully, the battery retains 80% capacity after:

  • 📅 2 years active use (1 full cycle per day).
  • 🔋 500-600 full cycles charging/discharging.

After 3 years the capacity usually drops to 60-70%, which leads to rapid discharge. Replacing the battery costs ~1500-2500 rubles (depending on the service).