Why the battery on Xiaomi Redmi Note 7 goes down quickly: a full analysis of the causes and solutions

Why did the Redmi Note 7 become “gluttonous”?

Xiaomi Redmi Note 7, released in 2019, has a 4,000 mAh battery — enough on paper for 1.5 to 2 days of active use. However, many owners are faced with the fact that the charge melts literally before their eyes: from 100% to 0% in 6 to 8 hours, and sometimes the phone discharges even in standby mode.

The causes fall into three categories: software failures (settings, applications, firmware), hardware problems (battery wear, damage) and external factors (temperature, chargers). In this article, we will break down each of them — from obvious to hidden — and give clear instructions on how to return the Redmi Note 7 to normal autonomy.

If your smartphone is older than 3-4 years, the problem may be the degradation of the lithium polymer battery, which is irreversibly reduced over time, but even then, there are ways to extend the life of the battery.

1. Programmatic reasons: what "eats" the charge in the background?

To start with, the most common, non-optimized software, MIUI, even in current versions, is a sinister background activity and application auto-run, and here are the key voracious features:

• 🔍 Autosynchronization: Mail, social networks, instant messengers constantly exchange data with servers.
• 📡 Mobile Internet in the background: Some apps (like TikTok or YouTube) continue to download content even when you’re not using them.
• 📍 Geolocation services: Google Maps, Yandex.Maps, and system services (e.g. com.google.android.gms) are constantly tracking location.
• 🔄 Auto-Update Apps: Play Market and Mi App Store can download updates in the background.

How do you check this? Go to Settings → Battery → Battery Use. This shows the charge consumption of the apps over the past 24 hours. If any of them have eaten more than 10-15%, that's a good reason to optimise.

⚠️ Warning: If you see an Android System process or MIUI Daemon running >20% in the battery consumption list, this is a sign of a system failure. Solution: reset the cache via Settings → Memory → Clean up or reset to factory settings.

Another common problem is that the energy saving mode is not working properly, and MIUI has three levels of savings:

Check which mode you have activated: Settings → Battery → Power Saving Mode. If your phone runs out too fast, try switching to Balanced and tracking changes.

2. Hardware problems: battery wear and malfunction

If software optimization didn’t work, the problem could be the physical state of the battery. Lithium polymer batteries degrade over time: after 300 to 500 charging cycles, their capacity decreases by 20 to 30 percent. For the Redmi Note 7, released in 2019, this is already true today.

How to check the wear of the battery?

1. Install the AccuBattery app (available in the Play Market).
2. Charge your phone to 100% and use it normally until discharged.
3. In the Battery Health section, the app will show the actual capacity, and if it's below 3,000 mAh, the battery is worn out.

Other hardware reasons:

• 🔌 Faulty power controller: If the phone doesn't hold the charge even after the battery is replaced, the problem may be in the chip on the motherboard.
• 🌡️ Overheating: If the housing is heated for no apparent reason (e.g., during charging or in a downtime), this may indicate a short circuit in the battery.
• 🔋 Unqualified battery replacement: Cheap, non-original batteries often have lower capacity and degrade faster.

⚠️ Warning: If the battery is swelling (the phone body is convex, the screen is moving away from the frame), immediately stop using the device. This is dangerous: risk of fire or explosion! Contact the service center for replacement.

If you decide to replace the battery yourself, choose the original batteries labeled BM47 (battery code for Redmi Note 7).The cost is from 1500 to 2500 rubles. Non-original analogues (for example, from Baseus or Remax) can last less than a year.

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Before replacing the battery, back up your data via Settings → Additional → Backup. After replacement, you may need to reset your settings.

External factors: charging, temperature and operating conditions

Even a good battery will run out quickly if you:

• ❄️ Use your phone at low temperatures (below +5°C). Lithium polymer batteries lose up to 50% of their capacity in the cold.
• ☀️ Leave your smartphone in direct sunlight or in your car in the summer, and at temperatures above +40 °C, the battery degrades 2-3 times faster.
• 🔌 Use non-original chargers or cables, and cheap power supplies can be unstable, causing overheating.
• 🔄 You often discharge your phone to zero. Deep discharges shorten battery life.

The best conditions for the Redmi Note 7:

If you often charge your phone overnight, turn on Optimized Charging in Settings → Battery → Additional settings. It limits the charge to 80%, then up to 100% before waking up – this reduces battery wear.

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Use only original or certified Quick Charge 3.0 chargers. Cheap ones can damage the power controller.

4. Hidden charge eaters: viruses, mining and advertising

One of the most insidious reasons for fast discharge is hidden processes that the user does not see in the battery consumption list.

• 🦠 Malware: Some viruses disguise themselves as system processes (e.g., com.android.system) and use the phone’s resources to mine cryptocurrency or send spam.
• 📢 Aggressive Advertising: Integrated Advertising applications (especially games and pirated programs) can consume up to 30% of the charge in the background.
• 🔄 Automatic backups: Google Photos, Mi Cloud, and other sync services can download gigabytes of data in the background.

How can we detect and remove these processes?

1. Check your phone for viruses with Malwarebytes or Dr.Web Light.
2. Open Settings → Apps → Permissions → Autostart and disable autorun for suspicious programs.
3. Install Greenify (requires root rights) – this application suspends background activity of selected programs.

Pay special attention to games and applications from unknown sources, such as the popular Free Fire or PUBG Mobile game in the background can consume up to 20% of the charge due to advertising modules.

5 Updates and firmware: how MIUI affects autonomy

Xiaomi regularly releases updates for the Redmi Note 7, but not all of them are optimized for battery saving.For example, after upgrading to MIUI 12.5, many users complained about increased battery consumption due to new animations and background processes.

How do you check if the firmware is to blame?

• 📱 Compare battery consumption before and after the upgrade to Settings → Battery → Statistics.
• 🔍 See reviews on forums (e.g., 4PDA or Mi Community) – if the problem is massive, Xiaomi will usually release a patch.
• 🔄 Try to roll back to the previous version MIUI (requires unlocking the bootloader).

If you don’t want to roll back, try the following settings:

1. Turn off System Animations in Settings → About Phone → MIUI version (click 7 times on the version to open Developer Mode, then go to Settings → Additional → For Developers and set Windows Animation, Transition Animation and Animation Duration on No Animation).
2. Disable Mi Cloud and Xiaomi Sync in Settings → Accounts.
3. Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.

⚠️ Warning: If the phone not only becomes discharged quickly but also overheats after the upgrade, this may indicate a firmware error, in which case it is recommended to reset to factory settings (Settings → Additional → Restore and Reset).

6.Manual Optimization: 10 Working Ways to Extend Battery Life

If you do not want to understand the reasons, but just want to reduce the charge consumption here and now, use these tips:

1. Reduce the brightness of the screen to 50-60% and turn on Adaptive Brightness (Settings → Display).
2. Set a dark theme (Settings → Display → Dark theme) – on AMOLED- screens, this saves up to 15% charge.
3. Turn off the “Always on display” (Settings → Screen lock).
4. Turn on Airplane Mode at night or in places without a network.
5. Turn off Wi-Fi and Bluetooth if you are not using them.
6. Set background activity limits for applications in Settings → Battery → Battery Optimization.
7. Turn off App Auto Update in the Play Market (Settings → App Auto Update → Never).
8. Use the “Lite Versions” of apps (e.g. Facebook Lite, Messenger Lite).
9. Turn off vibration when typing and notifications (Settings → Sounds and vibrations).
10. Enable Traffic Saving (Settings → SIM- Cards and Mobile Networks → Traffic Savings).

These measures will help extend autonomy by 20-40% depending on the use case.

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The most voracious features on the Redmi Note 7 are mobile internet, geolocation and bright screen, and turning off at least one of these items will give a noticeable increase in the time of operation.

7. When is it time to bring the phone to the service?

If you've tried all the tips, but the battery still goes down in a few hours, it's probably a hardware problem.

• 🔋 The phone is running at 1% per minute in standby mode.
• 🌡️ The body heats up for no apparent reason (even when the phone is lying idle).
• 🔌 Charging is slower than usual or interrupted.
• 📉 The AccuBattery app shows a battery capacity of less than 70% of the nominal.
• 💥 The phone turns off on its own at 20 to 30 percent charge.

The cost of diagnostics in official service centers Xiaomi — from 500 rubles. Replacing the battery will cost 1500-3000 rubles (depending on the region and type of battery).

If you live in a small town that doesn't have Xiaomi service centers, look for workshops with good reviews.

• Do they use original parts?
• Do you have a job guarantee (at least 3 months).
• Do you have any experience with the Redmi Note 7?

⚠️ Warning: If the phone is running out faster after the battery is replaced than before it was replaced, it's a sign that the wizard has used a poor battery or damaged the power controller. Demand a rediagnosis!

FAQ: Frequent questions about the Redmi Note battery 7