Xiaomi Redmi Note 5 is still a popular smartphone due to the balance of price and performance, but many users face one pressing problem: the battery is running out too quickly. If your device has been charging for a day on a new firmware, and now barely lasts until the evening, it is not always the fault of time. Most often the problem lies in the software, settings or improper operation.
In this article, we will not say obvious things like “turn off Wi-Fi” or “reduce brightness” but instead, we will look at the hidden causes that eat up charge invisibly: from firmware defects. MIUI You'll learn how to accurately diagnose a problem, what settings to change first, and when to think about replacing the battery.
We will pay special attention to the unique feature of the Redmi Note 5 – the incorrect operation of the power controller on some board revisions, which can lead to increased power consumption even in standby mode. This information is relevant for your model and does not apply to other Xiaomi smartphones.
1. Background processes and "gluttonous" applications
The most common reason for fast discharge is apps 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. 5 with its Snapdragon processor 636 and 3/4 GB of RAM is especially critical: the system is forced to kill background tasks, but some applications are able to bypass these limitations.
How to check:
- 📊 Open the Settings. → Battery → Battery usage. This is the apps that use the most energy.
- 🔍 Check the Settings section → Annexes → Permits → Autostart. You can turn off the automatic start of unnecessary programs here.
- 🚫 Use the built-in Auto Start Manager MIUI (Settings → Battery → Battery setup → Managing Auto-Run Applications) to Block Background Activity.
Typical "culprits":
- 📱 Facebook and Instagram – known for aggressive background activity even when closed.
- 💬 Messengers (WhatsApp, Telegram, Viber) – constantly synchronize messages and media files.
- 🎮 Games with push notifications (such as Clash of Clans or Clash of Clans) PUBG Mobile – can run background processes to update events.
⚠️ Warning: Do not disable auto-run for system applications (e.g. com.android.phone or com.miui.securitycenter).This can cause the phone to malfunction.
2. Firmware problems MIUI: bugs and optimization
Redmi Note 5 is out now MIUI 9 based on Android 7.1 Nougat, but over the years of the model’s existence, the firmware has been updated to MIUI 12.5 (Android 10) Each major update could bring both improvements and new bugs that affect autonomy. MIUI 11.0.2.0 and MIUI 12.0.1.0 users massively complained about increased battery consumption due to the incorrect operation of the Google Play service and microservices MIUI.
How to diagnose:
- 🔄 Check the current version of the firmware in Settings → The phone. → Version. MIUI. Compare with the latest stable builds on the official Xiaomi website.
- 🛠️ If you have custom firmware installed (like LineageOS or Pixel Experience), the problem may lie in an unoptimized kernel.
- 📥 Try resetting to factory settings (Settings) → Additionally. → Recovery and reset), but pre-repair backup.
| MIUI version | Known battery problems | Recommendations |
|---|---|---|
| MIUI 9.x – 10.x | High cost due to memory leakage in Google services | Update to MIUI 11+ Or turn off Google sync. |
| MIUI 11.0.2.0 – 11.0.3.0 | Problems with Snapdragon 636 processor optimization | Back on. MIUI 10 or upgrade to 12.x |
| MIUI 12.0.1.0 – 12.0.3.0 | Increased energy consumption due to new animations and services | Turn off "Super Wallpaper" and "System Animations" |
| MIUI 12.5.x | Stable work, but possible bugs with notifications | Update to the latest subversion |
If you don’t want to upgrade or roll back, try the following:
Turn off "Super Wallpaper" in Settings → Screen.
Set the performance mode on "Battery" in Settings → Battery → Performance mode
Turn off "Adaptive brightness" and set a fixed value
Prohibit battery optimization for critical applications (e.g. alarm clock)-->
Battery wear: how to check and what to do
The average life of a lithium-ion battery is 2-3 years, or 500-800 charge cycles. If your Redmi Note 5 is in use longer, the problem may be battery degradation. Even if the smartphone was idle, the battery loses capacity over time.
How to check the wear:
- 🔋 Install the AccuBattery app (available on Google Play) and it will show the current battery capacity and wear and tear.
- 📉 B Settings → Battery → Battery status (not available on all versions) MIUI) You can see the approximate percentage of wear.
- 🔌 If the smartphone discharges by 20-30% per night in the mode of the aircraft – this is a sure sign of wear and tear.
Critical signs:
- 🔥 The battery swelled (seen by the raised screen or the warping of the body).
- ⚡ The smartphone turns off at 20-30% charge or suddenly shuts down.
- 🔄 Charging is jerking or interrupted.
⚠️ Warning: If the battery is swelling, stop using the smartphone immediately.The risk of fire or damage to the board is extremely high.
The cost of replacing the battery with the Redmi Note 5 in 2026:
- Original battery (Xiaomi) – 1,500–2,500 ₽.
- Analogue (quality) - 800-1 500 ₽.
- Replacement in the service - 500-1000 ₽ (If you do it yourself, save money).
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Before you change the battery, check it for authenticity. Xiaomi's original battery has a holographic sticker with a serial number that can be checked on the manufacturer's website.
4. Wrong charging: myths and reality
Many users believe that “you need to discharge the battery to zero” or “charging only with the original RAM will save the battery.” In fact, for the Redmi Note 5 (as for all modern smartphones), there are different rules:
What really hurts the battery:
- 🔥 Overheating during charging (for example, if you play games or use a navigator).The optimal temperature is 10-35°C.
- ⚡ Using “fast” charges at 18-20 W. Redmi Note 5 supports only Quick Charge 3.0 (up to 18 W), but constant charging at maximum reduces the service life.
- 🔌 Long-term charge (100% charge) + This puts unnecessary strain on the power controller.
How to charge correctly:
- 🔋 Keep the charge level in the range of 20-80%, full discharge and charge up to 100% accelerate degradation.
- 🛌 Don’t leave your smartphone on overnight charging. Use smart timer outlets or turn off power after reaching 80-90%.
- ☀️ Avoid charging at high or low temperatures, such as not putting your phone in the sun or near a heating battery.
Why isn’t the original RMS always better?
5. Hardware problems: power controller and plumes
Redmi Note 5 has one unique hardware feature: on some board revisions, the power controller (PMIC) It's prone to overheating, which leads to increased power consumption even when it's in standby mode:
- 📉 The phone is discharged by 10-15% per hour in the mode of the aircraft.
- 🔥 The body warms up in the area of the chamber or the bottom (where the controller is located).
- 🔌 Charging is slow or interrupted.
Other possible hardware reasons:
- 🔌 Damaged USB-Type C connector – can cause short circuits and increased consumption.
- 📶 Faulty communication module (Wi-Fi, Bluetooth, NFC) — If it's constantly trying to connect to the network, it eats up the charge.
- 🛠️ Oxidized battery contacts – lead to unstable power supply and sudden shutdowns.
How to diagnose:
- Check the body temperature in standby mode (should not be higher than 30-35).°C).
- Connect your phone to your PC and check logs through ADB: adb shell dumpsys battery Pay attention to voltage and temperature parameters.
- If you suspect a power controller, contact the service for a multimeter diagnosis.
⚠️ Attention: If the problem is in the power controller, self-repair is not recommended.It requires soldering of the chip, which without experience can lead to a complete failure of the board.
6. Network and Location Settings: Hidden Charge Eaters
Many users are unaware that mobile network and geolocation settings can significantly affect autonomy. 5 constantly switching between 2G/3G/4G or looking for a signal in poor coverage, battery consumption increases in 2–3 once.
How to optimize:
- 📶 Turn off automatic network search. Go to Settings. → SIM-maps and mobile networks → Select the network and select the mode Only 4G (preferably or only 3G, if 4G unstable.
- 📍 Set up geolocation. In Settings. → Confidentiality → Permits → Geodata, disable access to unnecessary applications. Use mode only on GPS (without mobile data and Wi-Fi for savings.
- 🔄 Turn off background data transfer for applications in Settings → Annexes → Transfer of data.
Additional advice:
- 🌐 If you rarely use mobile internet, switch to mobile. 2G — This will significantly reduce energy consumption.
- 📡 In areas with a bad signal (metro, basement) go to the plane mode so that the phone does not waste charge on endless attempts to connect.
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The biggest battery consumption is when the network signal is weak, and if you have a 1-2 divisions of the coverage scale, the phone spends 5-10 times more energy maintaining the connection.
7. Screen and gesture optimization
Redmi Note Display 5 — 5.99-inch IPS permittingly 2160×1080 — One of the biggest consumers of energy, even small changes in settings can extend autonomy. 15–20%.
What can be done:
- 🌓 Reduce brightness to a comfortable level (optimum 40–60%). Turn off adaptive brightness in Settings → Screen.
- ⏱️ Reduce screen waiting time. Set 15 to 30 seconds in Settings → Screen. → Sleeping mode.
- 🎨 Use dark wallpaper. AMOLED-It saves the charge on the screen, but even on the IPS Dark tones reduce the load on the lighting.
- 👆 Turn off gestures. If you use gesture navigation (MIUI Full Screen Gestures, switch to classic buttons – they are less resource-intensive.
In addition:
- 🔍 Turn off "Wake Up" and "Double Touch to Wake Up" in Settings → Screen. → Lockdown and protection.
- 📱 If you don’t use Always On Display (available on custom firmware), turn it off – it eats up to 5% charge per hour.
8 When it's time to bring in service: signs of serious problems
If you've tried all the tips, but the battery still runs out in a few hours, maybe the problem is deeper than it seems.
- 🔥 The phone warms up even without load (for example, in standby mode).
- ⚡ The battery swelled or deformed the body.
- 🔌 The smartphone does not hold a charge (discharges by 50% in 30 minutes).
- 🛠️ After a fall or impact, problems with charging appeared (not stable power supply, spontaneous reboots).
- 📵 The phone turns off at 20-30% charge and turns on only after connecting to the RAM.
Cost of diagnostics in official Xiaomi services – 500-1000 ₽. If the motherboard is the problem, repairs can cost 3,000 to 8,000. ₽, So it's sometimes cheaper to buy a new smartphone, but for the Redmi Note 5, it's usually worth replacing the battery or the power controller, and after repairs, it'll last another 2-3 years.
Where to look for service:
- 🏢 Xiaomi’s official service centers – a guarantee for work and parts, but more expensive.
- 🔧 Local workshops are cheaper, but check reviews and ask for a guarantee.
- 🛒 Self-repair – only if you have experience with a soldering station and a multimeter.
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If your phone is running at 1% per minute on standby, that's a sure sign of hardware failure.