Xiaomi Redmi Note 4 is fast discharged: all the reasons and ways of solving

Xiaomi Redmi Note 4 is a legendary smartphone that is still used by millions of users. However, over the years, its main problem has become more obvious: the battery is discharged literally before our eyes. If the device used to hold a charge for a day, now barely lasts until the evening. What is the reason for this behavior and can we fix it?

In this article, we'll look at all the possible causes of rapid discharge, from software failures to physical battery wear, how to diagnose a problem, what settings to optimize, and when to think about replacing a battery, and we've run tests and collected real-time statistics on the Redmi Note 4 across different firmwares.

Spoiler: In 80% But there are some unpleasant things that the manufacturer doesn't mention, like after the first half of the year, the problem is solved without repair. 3 Years of operation capacity of the Redmi Note battery 4 fall 30-40%, Even if you've been following the charging cycle.

1. Physical wear of the battery is the main cause

Any lithium-ion battery degrades over time. - Redmi Note 4 battery-mounted 4100 max, but through 2-3 In the year to year, its actual capacity is reduced to 2500-3000 This is a normal process, but many users do not consider it when diagnosing it.

How to check battery wear without disassembling your phone? Type ##4636## in the Phone app, then go to Battery Information. The Health (or Battery Health) setting will show current capacity as a percentage of the factory capacity. If it's below 70%, the battery needs to be replaced.

• 🔋 1-2 year of use: capacity 85-95% from the factory. 12-18 medium-load.
• ⚠️ 3 year and older: capacity 60-75%. The phone's running out of power. 6-10 hours even on standby.
• ❌ 4+ year: capacity below 60%. The device may be switched off when 30-40% charge.

⚠️ If the phone suddenly turns off when 20-30% The battery is in critical condition, and further use is dangerous, with potential for swelling and damage to internal components.

The rate of degradation depends on several factors:

• 🔌 Frequency of full discharges: each full cycle (0-100%) reduce battery life.
• 🌡️ Temperature: Operation during +40°C and above accelerate the wear in 2-3 once.
• ⚡ Using "fast" charging: constant high currents reduce the service life of 10-15%.

Programmatic reasons: what "eats" the charge in the background

Even with the new battery, the Redmi Note 4 can run out in a matter of hours due to background processes.

1. MIUI and system services: Xiaomi's shell is known for its high power consumption, for example, the service miui.analytics can consume up to 15% of the charge per day.
2. Auto-run apps: instant messengers (WhatsApp, Telegram), social networks (Facebook, TikTok) and games often wake up in the background.
3. Poorly optimized games: PUBG Mobile, Genshin Impact or Call of Duty drain battery by 1% per minute.
4. Viruses and Advertising Software: Some applications from third-party sources disguise themselves as system applications and spend a charge on mining or displaying ads.

How to find "gluttonous" applications? Go to Settings → Battery → Battery usage. This is the application charge rate over the last 24 hours:

• 📱 Screen: 20-30% (high-end).
• 📶 Mobile network/Wi-Fi: 10-15%.
• 🤖 Android System: 5-10%.
• ⚠️ Any application over 15% is a reason to optimize.

One of the most effective ways to reduce costs is to disable the auto-run of unnecessary applications.

1. Go to Settings → Applications → Autorun.
2. Sort the list by the date of last use.
3. Turn off auto-runs for apps you use less than 1 time per week.

3. MIUI settings that kill the battery

Shell MIUI It offers a lot of features, but many of them work in the background and consume charge.-5 settings that should be turned off:

• 🔍 "Device search” (Settings) → Google → Security: Constantly using GPS mobile data.
• 📡 "Smart transmission” (Settings → Connections → Smart Transfer: Scans Wi-Fi and Bluetooth networks in the background.
• 🎨 "Animation of system applications": increases the load on the processor when you open the menu.
• 📊 "Usage statistics” (Settings → Battery → Statistics: Collects activity data 24/7.
• 🔔 "Activity notifications” (Settings) → Notifications: Wakes the processor to display notifications.

Another hidden function that eats charge is Adaptive Brightness. MIUI It often makes mistakes and overstates the brightness of the screen. 40-50% and enable manual adjustment.

It is equally important to set up the energy saving mode:

1. Go to Settings → Battery → Battery Mode.
2. Choose Balanced or Energy Saving (not Performance!).
3. Activate the Sleep option when locking the screen – it turns off background processes after 5 minutes of inactivity.

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After the update MIUI phone began to discharge faster, try resetting to factory settings (Settings) → Additionally. → Resets: This often solves the problem without losing data (but back up!).

4.Iron Problems: What to Check Except for Battery

If the software optimization didn't work, the problem could be the hardware, and here are the most common malfunctions.

• 🔌 Faulty Charging Controller: The phone can show 100% charge, but the battery actually only charges up to 80%.
• 📶 Bad antenna contact: A smartphone spends a lot of energy searching for the network if the antenna has moved away or oxidized.
• 🔥 CPU overheating: If the Redmi Note 4 heats up even in a simple one, it's a sign of thermal paste wear or chipset malfunction.
• 🔄 Unoriginal charger: Cheap adapters can deliver unstable voltage, which accelerates battery wear.

How to diagnose hardware problems?

1. Check the temperature: install the app AIDA64 And look at the processor temperature in plain: 30-40°C. If above, cleaning or replacement of the heat paste is required.
2. Charging test: plug in the original charger and watch the charge rate. If it jumps (e.g. 1%, then 0% per minute), the problem is in the controller.
3. Network Check: From the Engineering Mode menu (#4636##) select Phone Information and look at the setting ASU. If it is constantly changing, the antenna is unstable.

⚠️ Attention, if the phone starts to run out faster after a fall or impact, don't try to disassemble it yourself".

The Redmi Note 4 supports Quick Charge 3.0, but many users use non-original power supplies.

• ⚡ The original charger (5V/2A, 9V/2A): stable charging, minimal wear of the battery.
• ❌ Cheap Chinese (5V/1A): Slow charging, overheating, accelerated battery degradation.
• ⚠️ "Universal" block (5V/2.4A): It can cause unstable voltage, which causes the controller to fail.

5. Impact of firmware and updates on autonomy

Redmi Note 4 has received a lot of updates MIUI, But not all of them are optimized for energy savings. MIUI 12 Many users complained about increased battery consumption due to new animations and background services.

How to check if the firmware is to blame? Install the AccuBattery app and follow the discharge schedule during the course of the test. 2-3 If the cost has increased dramatically since the upgrade, try it:

• 🔄 Reverse to the previous version MIUI (if available).
• 🛠️ Install custom firmware (such as LineageOS or Pixel Experience) optimized for autonomy.
• ⚙️ Reset the settings to factory (pre-make a backup!).

If you decide to use custom firmware, take into account the risks:

To install custom firmware will require:

1. Unlock the bootloader (fastboot oem unlock).
2. Install TWRP Recovery.
3. Sweep ZIP-firmware TWRP.

6.When it's time to change the battery: signs and cost

If all software methods have been tried, and the phone is still discharged. 3-4 It's time to think about replacing the battery, and here are the clear signs that the battery has run out of life:

• 🔋 The phone turns off when 20-30% charge.
• 🔥 The body swelled (seen by the gaps between the screen and the frame).
• ⚡ Charging is jerky (1%, then 0% per minute).
• 🕒 Standby time less than 8 hours.
• 🌡️ The phone warms up when charging.

The cost of replacing the battery with the Redmi Note 4 in 2026:

If you have experience disassembling phones, you can try it yourself.

• 🛠️ Set of screwdrivers (Torx) T3, T4).
• 🔧 Plastic blades for disassembly.
• 🔋 New battery (check for glue layer).
• 🔥 Hazel for softening glue (temperature) 60-80°C).

⚠️ Attention, if you change your battery yourself, don't use metal tools to unplug the plume. One careless move will damage the motherboard. 500-700 rupees for service.

After the battery replacement, it is necessary to:

1. Completely discharge and charge the phone 2-3 time (calibration).
2. Do not use fast charging for the first 5 cycles.
3. Check the battery temperature in AccuBattery – it should not exceed 40°C when charging.

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Replace the battery with the Redmi Note 4 pays off 1-2 The new battery will bring back autonomy to the next month by saving on powerbank and reducing charging time. 1.5-2 daytimes.

7.Alternative ways to extend the life of the battery

If replacing the battery is not part of your plan, you can try extending your life using these methods:

• 🔌 Charging with low currents: use the power supply unit on 5V/1A (It's an old iPhone, for example. It'll reduce battery load.
• 🌙 Night mode: turn on Do not disturb and Energy saving for the night.
• 📴 Mobile data shutdown: If you’re connected to Wi-Fi, turn off 4G/LTE customized SIM-map.
• 🔄 Partial discharge: Try to keep the charge in range 20-80% (Use AccuBattery to control).
• ❄️ Refrigeration: Do not leave your phone in the sun or near heat sources.

Another non-obvious way is to turn off unnecessary sensors, and many applications use a gyroscope, a compass, or a proximity sensor unnecessarily to turn them off.

1. Install Package Disabler (root rights required).
2. Find and disable services: com.qualcomm.sensors (Qualcomm sensors), com.miui.sensor (sensors) MIUI).
3. Reboot the phone.

If you play frequently, try to reduce the performance of the processor:

1. Install Kernel Adiutor (need root).
2. In the section CPU Choose Governor Powersave.
3. Limit the maximum frequency to 1.6-1.8 GHz (instead of GHz) 2.0 GHz).

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If you are using the Redmi Note 4 As a second phone (for example, for work), set up a power saving profile with limited background data. 3-4 Days with minimal activity.

FAQ: Answers to Frequent Questions