Why Xiaomi is fast discharged and how to fix it: the complete guide

Have you noticed that your Xiaomi runs out in half a day, even though it used to hold a charge for a day? Or the phone suddenly shuts down at 20-30% charge? The problem of fast battery discharge is one of the most common complaints of owners of smartphones Redmi, POCO and Mi. The reasons can be hidden in software failures MIUI, and in the physical wear of the battery.

In this article, we'll look at 12 proven ways to get your phone back to its old self-driving status, from basic settings to hidden engineering menu features, how to calibrate a battery without root, which apps devour charge in the background, and why even a new battery might not work properly, and at the end, a checklist for quick diagnosis of the problem.

1.Diagnostics: Why Xiaomi is fast landing

Before you optimize, you need to understand the root of the problem. MIUI has built-in tools for analyzing the charge flow:

1. Open Settings → Battery and performance → Battery use.
2. Look at the flow chart for the last 24 hours. The normal discharge is standby, 0.5-1% per hour. If more, there's a problem.
3. Click on "Details" (three dots in the upper right corner) and select "Battery Use by Apps." Here you can see which programs are active in the background.

Typical charge eaters on Xiaomi:

• 📱 Social networks (Facebook, Instagram) – constantly update content in the background.
• 📍 Geolocation services (Google Maps, Yandex.Maps, taxi applications).
• 🎮 High graphics games (Genshin Impact, PUBG Mobile – load the processor and GPU.
• 🔄 Autosynchronization (Google Photos, Mi Contact, cloud storage).

If the Android System or MIUI System is the leader, the problem is the firmware, and if a particular application is to blame, it should be limited (more on this in the next section).

⚠️ Note: If the phone is running out 10-15% And if you're in airplane mode overnight, it's a sign of battery wear or a power controller failure. Calibration won't help, you need to change the battery.

2. MIUI optimization: hidden savings settings

MIUI has some unique features for battery life extension that are disabled by default.

2.1. Super-saving mode (Ultra Battery Saver)

This mode turns off background activity for all applications except those you select, activates automatically at 5% charge, but you can manually turn on:

1. Go to Settings → Battery and Performance → Super-Savings Mode.
2. Add to the exceptions instant messengers and applications for calls (for example, WhatsApp, Telegram, standard “Phone”).
3. Enable the option "Automatically turn on at low charge".

Restriction of background activity

Many apps continue to work after they close, and to stop them:

1. Open Settings → Applications → Application Management.
2. Select a problem app (like TikTok) → Battery Limits → Background Activity Limits.
3. To completely disable the background, set “Autostart” in the “Off” position.

Another useful trick is to turn off the animation, which will speed up the phone and reduce the load on the processor.

1. Activate Settings → About Phone → MIUI version (click 7 times to turn on Developer Mode).
2. Return to “Settings → Additional → For Developers” and install:
3. The scale of the animation windows → No animation.
4. The scale of the transition animation → Without animation.

3. Calibration of the battery without root

If the phone shows the wrong percentage of charge (for example, it turns off abruptly at 30%), calibration will help, which works on all Xiaomi with a li-polymer battery (all modern models).

Step-by-step:

1. Discharge your phone to 0% (until it shuts down on its own).
2. Put the charger on and wait for the battery icon to appear on the screen.
3. Charge 2-3 hours after reaching 100% (to complete the balancing of the cells).
4. Turn off charging, turn on the phone and check the real percentage in Settings → Battery.
5. Repeat the cycle 2-3 times for accurate calibration.

For models with a non-removable battery (for example, Redmi Note 10 Pro, POCO X3 Pro) calibration is especially important, since physical reset (battery removal) is not possible.

⚠️ Note: Do not use calibration apps from Google Play (e.g. Battery Calibration) they just reset the file. batterystats.bin, which has a temporary effect and can disrupt work MIUI.

4.Firmware problems: how the upgrade affects the battery

Often, the quick discharge starts after the MIUI update. For example, Redmi Note 9 users complained about bugs with autonomy after switching to MIUI 13.

4.1.Return to stable version

If the problem has occurred after the update:

• 🔄 Check out the latest firmware reviews on the forums (4PDA, Mi Community).
• 📥 Download the old version MIUI From the official website (Xiaomi Firmware).
• 🔧 Install through Settings → Updating the system → Three points. → Select a firmware file.

Resetting to factory settings

If the rollback doesn’t help, do a hard reset (all data will be deleted!):

1. Make a backup through Settings → Additional → Backup and Reset.
2. Go to Settings → About the phone → Reset settings.
3. Select “Erase all data” and confirm.

After reset, do not restore data from the backup - first check the battery on the "clean" system. If the discharge normalized, the problem was in the software.

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Before reset, write down the phone's IMEI (type *#06#). In rare cases, after a hard reset, it may reset and you'll need to restore it through an engineering menu.

5. Physical reasons: when to replace the battery

If all software methods have been tried, and the phone still discharges in 3-4 hours, the physical wear of the battery is to blame. The average life of a lithium-polymer battery is 2-3 years (or 500-800 charging cycles).

Signs of a worn-out battery:

• 🔋 The phone turns off when 20-30% charge.
• 🔥 The battery heats up during charging or playing.
• ⚡ The charging time has increased in 1.5-2 once.
• 📉 B Settings → Battery. → The battery state of the capacity shows less than 80% of the original.

To check the capacity, use the AccuBattery application (showing real wear) or the engineering menu:

1. Dial ##4636###.
2. Select "Battery Information".
3. Compare your health (should be close to your health).

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If the battery capacity has dropped below 70%, it must be replaced, and further use can cause the phone to suddenly shut down or damage the power controller.

The cost of replacing the battery in the service center Xiaomi:

When replacing a battery, be sure to use an original or certified one (such as from ZMI), cheap ones can not only fail quickly, but also damage the power controller.

6. Additional tips: how to extend the life of the battery

Even a new battery will last longer if you follow these rules:

• 🔌 Don't keep your phone charging all night. The best way to charge is to charge until 80-90% and off.
• ☀️ Avoid overheating.Do not leave your phone in direct sunlight or on charge while playing.
• ❄️ Do not operate in the cold. lithium polymer batteries lose up to 30% lower-temperature -10°C.
• 🔄 Use the original chargers. Quick Charge or HyperCharge quick charging reduces battery life on the battery. 10-15% yearly.

For models that support wireless charging (Mi 11 Ultra, Mi 13), avoid using Qi chargers all the time – they heat the phone more than wired ones.

If you play heavy games frequently, set the FPS limit (frames per second) through Game Turbo:

1. Open the game, swipe from top to bottom to call the Game Turbo panel.
2. Click on the icon. ⚙️ → «Performance settings».
3. Set the limit to 30 or 60 FPS (instead of 90/120).

7. Engineering menu: hidden settings for experienced

For advanced users, there is a way to fine-tune the power controller through an engineering menu.

How to open the engineering menu:

1. Type ##36446337## (to be used) MTK-processors) or #4636## (for Qualcomm).
2. Select Battery Information.

You can see here:

• Battery health is the battery state (Good/Normal/Poor).
• Battery temperature - temperature (normal: 25-40 ° C).
• Voltage is the voltage (normal: 3.7-4.2V).

To reset battery statistics (if the phone displays percentages incorrectly):

1. In the engineering menu, select Battery → Battery Calibration.
2. Press Calibrate (may require root).

⚠️ Note: Do not change the settings in the section MTK Engineer Mode → Hardware Testing → Battery without understanding the consequences! it could cause the battery to overheat or fail.

FAQ: Answers to Frequent Questions