Xiaomi Redmi Note 5
In this article, we will explore all the possible causes of rapid discharge of the Redmi Note 5, from software failures to physical battery wear. You will learn how to diagnose the problem yourself, what settings to optimize and when to think about replacing the battery. And also unique data on the real wear of batteries of this model after 4-5 years of operation, which is not found in official sources.
Let me warn you right away, not all causes are equally critical, like when you close a background application in two clicks, but when you have a degraded battery, you need to invest, but 80 percent of the time, you solve the problem without repair, you have to configure the system properly.
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1. Battery wear is the main cause of rapid discharge
Xiaomi Redmi Note 5 is equipped with a lithium-polymer battery capacity of 4000 mAh. According to the manufacturer, it is designed for 500 full charging cycles (from 0% to 100%). But after 300-400 cycles, the capacity begins to fall noticeably. If your smartphone is in use since 2018, most likely, the battery is worn out by 30-50%.
How do you check the wear?
- 📱 Enter the combination ##4636### in the Phone app, then select Battery Information. Level will show the current charge and health will show the state (perfect good, bad unknown or numbers below 80%).
- 🔋 Use apps like AccuBattery (Android) to show real capacity and wear rate.
- ⚡ If the smartphone is discharged on 1% post 1-2 minutes with the screen off is a sure sign of critical wear.
What do you do? Replacing the battery at the service center will cost you a lot of money. 1500-2500 rouble 2026 But be careful, cheap ones can be even worse than the original. BM47 (Original code for the Redmi Note 5).
⚠️ Warning: If after replacing the battery, the smartphone began to warm or discharge quickly, most likely, a poor-quality battery is installed!
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2.Background apps and auto-run: invisible charge eaters
Even if you haven't manually run apps, many of them run in the background: update data, show notifications, sync, especially voracious messaging apps (WhatsApp, Telegram), social networks (Facebook, VKontakte) and games.
How to find and disable background processes:
- Go to Settings → Applications → Permissions → Autorun.
- Turn off auto-run for all applications except system (e.g. Settings, Phone).
- In Settings → Battery → Battery Use, see which apps consume the most power. If there is a messenger in the top that you haven’t used, limit its background activity.
For radical optimization:
- 🚫 Turn off auto-update apps in Google Play (Settings) → Auto-update of applications → Never).
- 🔔 Stop background activity for underused applications in Settings → Annexes → [name] → Battery → Background activity.
- 📵 Use the energy saving mode (Settings) → Battery → Energy saving mode: It limits background activity and reduces productivity, but extends the operating time by 20-30%.
☑️ Optimization of background processes
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3. Screen settings: brightness, timeout and refresh rate
Redmi Note Display 5 permittingly 1080×2160 pixels are one of the main energy consumers. The brighter the screen and the longer it's on, the faster the battery goes down.
Optimal settings:
- 🌞 Set automatic brightness (Settings) → Display. → Brightness → Auto or manually reduce to 40-50%.
- ⏱️ Reduce screen timeout to 15-30 seconds (Settings) → Display. → Sleeping mode).
- 🔄 If your smartphone supports 90Hz (in some firmware), go back to 60Hz – it will save up to 15% charge.
Additional advice:
- 🌙 Enable a dark theme (Settings) → Display. → Dark subject. AMOLED-This reduces the consumption of screens 5-10% (Redmi Note 5 screen IPS, But the effect is still there).
- 📱 Turn off Always On Display if it is enabled (in some custom firmwares, this feature can be activated).
| Screen settings | Battery consumption | Recommendation |
|---|---|---|
| Brightness 100% | High (up to 30% of total expenditure) | Reduce to 40-60% |
| Time out 2 minutes | Medium (the screen lasts longer) | Set 15-30 seconds. |
| 90 Hz frequency | Increased (up to 10-15% more than 60 Hz) | Back to 60Hz |
| Dark subject. | Low (savings 5-10%) | Continuously switch on |
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The screen is the second largest consumer of power after the processor, and optimizing its settings can extend the life of 1-2 hours.
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4. Firmware failures and update errors
Unstable versions of MIUI or custom firmware can cause abnormal battery consumption, for example, after upgrading to MIUI 12/13, many Redmi Note 5 users complained of accelerated discharge due to power management errors.
How to diagnose the problem:
- 🔍 Check the firmware version in Settings → The phone. → Version. MIUI. If it is a beta version or custom build - a high probability of bugs.
- 📊 Go to Settings. → Battery → Battery use: If the Android system is in the box or MIUI Expenses of more than 10% are a sign of failure.
- 🔄 Try resetting the cache via Recovery: 1. Turn off the phone. 2. Press Power + Volume Up before the logo appears. 3. Select Wipe cache partition. 4. Reboot.
If resetting the cache didn't help, consider options:
- 🔄 Reverse to the stable version MIUI Mi Flash Tool (instructions are available on the forum) 4PDA).
- 🛠️ Install custom firmware based on Android 10/11 (For example, LineageOS, if the official updates are no longer available.
⚠️ Warning: Before resetting or flashing backup data! on Redmi Note 5, unlocking the bootloader erases all files.
What if the phone stopped turning on after the update?
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5 Network problems: weak signal and constant connection search
If your Redmi Note 5 is in a low 3G/4G coverage area or constantly switches between networks, the battery will go down 2-3 times faster, the same applies to always on Wi-Fi or GPS.
How to reduce the cost:
- 📶 Turn on the mode. 3G (Settings → SIM-maps and mobile networks → Preferred type of network → 3G), if 4G your neighborhood is unstable.
- 🔄 Turn off Wi-Fi auto search (Settings) → Wi-Fi → Additionally. → Searching the net → Never).
- 📍 Use it. GPS Enable Power Saving Mode for Geolocation (Settings) → Location → Regime. → Energy conservation).
- 📴 In roaming or places with poor signal, switch to aircraft mode for a time when the phone is not needed.
Check if the status bar has an icon! (exclamation point) next to the network indicator – this means that the smartphone is wasting energy on endless attempts to connect.
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If you’re often in places with poor signaling, buy a 4G repeater or go to the carrier with the best coverage in your area.
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6. Viruses, Mining and Malware
If the battery starts to run out suddenly, and in Battery Use you see unknown processes (for example, com.android.system with high consumption) – perhaps a virus on the phone. Especially dangerous is hidden cryptocurrency mining, which can load the processor 100% even in idle.
How to check and clean:
- Install Malwarebytes or Dr.Web Light and scan the system.
- Check the list of installed applications (Settings → Apps) and remove suspicious ones (especially with names like System Update, Battery Saver, if you haven’t installed them).
- If the antivirus does not find anything, but suspicions remain - reset to factory settings (Settings → Additional → Restore and Reset → Reset settings).
Signs of infection:
- 🔥 The phone is warming up without loading.
- 📉 Battery goes down at 1% per minute when the screen is off.
- 📦 In Settings → Battery visible unknown processes with high consumption.
⚠️ Attention: Do not install APK-Even legitimate applications (such as modified games) can contain hidden miners.
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7. Physical damage: moisture, falls and overheating
If the smartphone fell, got wet or overheated (for example, lying in the sun or charging under a pillow), it could damage the battery or power controller.
- 🔥 The phone warms up when charging or working.
- ⚡ The charge is jerky (fast, then slow).
- 💧 Under the screen, traces of corrosion or condensation are visible.
- 🔋 The battery is swelling (check if the smartphone is flat on the table – if it swings, the battery will blow up!).
What to do:
- 🛠️ If the battery blows up, immediately turn off the phone and bring it to the service!
- 💧 If the phone is wet, dry it in rice or silica gel on 24-48 Do not turn on until you have made sure that there is no moisture.
- 🔥 When overheating, check to see if the vents are closed (such as a cover). Charge the phone with the original charger only.
If after falling or getting wet, the smartphone began to discharge faster, but there is no visible damage - the problem may be in the power controller. its replacement will cost 2000-3500 rubles (2026).
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8. Non-original chargers and cables
Cheap charging and cables not only slow the phone to charge, but can also damage the battery.The Redmi Note 5 supports Quick Charge 2.0, but only with original or certified accessories.
How to choose a charger:
- ⚡ Use the original ZU from Xiaomi (5V/2A or 9V/2A).
- 🔌 If you are buying a replacement, use a Quick Charge model. 2.0/3.0 (For example, from Anker, Baseus).
- 🚫 Avoid “nameless” charges with AliExpress for 100 rubles – they can give unstable voltage.
Signs of problems with charging:
- ⚡ The phone charges for more than 3 hours to 100%.
- 🔥 The charger or cable is heated.
- 📉 The charge level jumps (for example, from 50% to 30 at once%).
If you suspect that the problem is charging, try charging your phone from another power supply, and if the charging speed is normal, it's the accessories.
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Non-original charges can reduce battery life by 20-30%. Always check certification (for example, the QC 2.0 sign on the package).
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