Xiaomi Redmi Note 8T
MIUI
The reasons can lie in both software failures and physical wear of the battery.
In this article, we will explore all the possible causes of rapid discharge of the Redmi Note 8T, from background processes to battery degradation, you will receive step-by-step instructions on diagnosis and fixing the problem, and you will learn when to think about replacing the battery.
If your Xiaomi Redmi Note 8T runs out in 3-5 hours with moderate use or loses 20-30% of its charge overnight in standby mode, it’s a clear signal that something is wrong with the device. Don’t be quick to blame the battery: 60% of the time, the problem is solved by system settings or cleaning the cache. Let’s start with the simplest and gradually move on to radical measures.
1. Charge consumption check: which apps "eat" the battery
The first step is to identify the voracious applications, and MIUI has a built-in monitoring tool that shows which programs use the most power, so you can open it.
- Go to Settings → Battery and Performance → Battery Use.
- Click on the flow chart for the last 24 hours.
- See the list of applications, sorted by consumption.
Look at programs that use upwards of 10 to 15 percent of their charge per day.
- 📱 Social media (Facebook, Instagram, TikTok) – especially if they work in the background.
- 🎮 Games (PUBG Mobile, Genshin Impact, Call of Duty – even after closing, they can leave processes.
- 📍 Geolocation services (Google Maps, Yandex.Maps, Uber) – are constantly used GPS.
- 🔄 Auto-Update (Play Market, Mi App Store).
If you see unknown processes (e.g. com.android.systemui or mediaserver) at the top of the flow rate, it may indicate viruses or firmware failures, in which case cache resetting or flashing will help.
2. Optimize MIUI settings to save charge
Xiaomi Redmi Note 8T runs on MIUI, which is known for its “gluttonous” interface, but there are hidden savings features in the settings that can extend the life of 20-30%.
What to Disable or Configure:
- 🔍 Autosynchronization: Go to Settings → Accounts and sync and disable automatic sync for unnecessary services (Google Drive, Mi Cloud).
- 📶 Background data transfer: in Settings → Mobile network → Data transfer limit background traffic for applications.
- 🌙 The dark subject and AOD: Turn on the dark mode (Settings) → Display. → Turn off Always On Display (if you have one).
- 🔄 Auto-Update: In Settings → The phone. → Update system disable automatic download of updates.
Pay special attention to the performance mode:
- Open Settings → Battery and Performance → Performance Mode.
- Choose Balance or Charge Savings instead of High Performance.
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If you don't use NFC or Bluetooth very often, turn them off in the Quick Settings panels, which consume power even when you're in standby mode.
3. Battery calibration: when the phone shows the wrong percentage of charge
Sometimes the Redmi Note 8T starts to jump from 30 percent to 1 percent or shut down at 15 to 20 percent charge, which is a sign of the battery controller being out of sync, and solves the calibration problem of resetting the charging cycle.
How to Calibrate the Battery on Xiaomi Redmi Note 8T:
Discharge the phone before automatically shutting down (0%)|Connect the original RAM and charge up to 100% without interruptions|Turn off the charger and turn on the phone.|Repeat the discharge/charging cycle 2 more times-->
If after calibration the problem remains, check the status of the battery:
What if the #4636## code doesn’t work?
4. Resetting to factory settings: a radical solution
If optimization and calibration didn't work, the last software method is to reset to factory settings, which will delete all the data, but return the phone to a "clean" state, eliminating hidden MIUI errors.
How to make a reset (Hard Reset):
- Back up your important data (Settings → Additional → Backup and Reset).
- Go to Settings → About the phone → Reset settings.
- Select “Erase all data” and confirm the action.
After reset, don't restore data from the backup immediately -- first check how the battery behaves in a clean system. If the discharge slowed down, the problem was in the software or application conflict.
⚠️ Warning: Reset deletes all files, including photos, contacts and messages. If you don't backup, it won't be possible to recover the data.
5. Virus and malware check
Viruses and mining scripts can covertly load the processor, which is why Redmi Note 8T It's very dangerous for users who install applications from unverified sources (APK-file).
Signs of infection:
- 📈 The phone is heated for no reason (even in plain sight).
- 🔋 Battery goes down faster than usual (for example, 1% per minute in standby mode).
- 📱 Unknown apps appear in the menu or notifications about viruses».
How to check and clean your phone:
- Install antivirus (Malwarebytes, Dr.Web Light or Bitdefender).
- Run a deep scan.
- Delete any suspicious programs.
- Check the list of device administrators (Settings → Passwords & Security → Device Administrators) – there should be no unknown applications.
If the antivirus does not find anything, but suspicions remain, reflash the phone through the Mi Flash Tool. This is guaranteed to remove all hidden threats.
6.Diagnostics of hardware problems: when to replace the battery
If all software methods have been tried and the Redmi Note 8T still runs out in 2-3 hours, the problem is almost certainly in the hardware.
- 🔋 Battery wear (capacity dropped below 2000–2500 mAh).
- 🔌 Charging controller malfunction (phone does not hold charge or "jumps" percentage).
- 📱 Damage to battery plume (for example, after falling).
How to check the status of the battery:
| Parameter | Norma. | Critical condition |
|---|---|---|
| Capacity (mach) | 3500–4000 | Less than 2,500. |
| Health level (%) | 85–100 | Less than 70. |
| Temperature in simple (°C) | 25–35 | More than 40. |
| Working hours (hours) | 4-6 (average load) | Less than 2. |
For accurate diagnosis, use AccuBattery or CPU-Z. If the battery capacity has dropped below 2500 mAh, it must be replaced. Old lithium polymer batteries not only discharge quickly, but can swell, causing damage to the screen or motherboard.
⚠️ Warning: If the battery is swelling (the phone body is bulging, the screen is "going away"), immediately turn off the device and contact the service center!
7. Battery replacement: where to buy and how to change
The Xiaomi Redmi Note 8T battery has a catalog number BM47 (or DM-07 in some batches), which can be replaced on its own or at a service center.
Where to buy the original battery:
- 🛒 Official Xiaomi stores (e.g. Mi Store or AliExpress marked “Original»).
- 🔧 Verified online stores (Beru, MegaMarket, Connected).
- 🏬 Local service centers (ask for batteries with warranty).
Cost and features of replacement:
| Option | Price (₽) | Pluses | Cons |
|---|---|---|---|
| Self-sustaining replacement | 800–1500 | Cheap, fast. | Risk of damaging the plume |
| Service centre | 1500–2500 | Guarantee, professionals | Dear, waiting time. |
| Universal battery (non-original) | 500–1000 | Low price | Less resource, risk of bloating |
Instructions for self-replacement:
- Turn off the phone and remove the tray for SIM-map.
- Heat the back cover with a hair dryer (temperature 60-70 ° C) and put it under a plastic spatula.
- Unscrew 10 screws (cross screwdriver PH00).
- Disconnect the battery plume and carefully remove it, putting it on the side.
- Install a new battery and assemble the phone in reverse order.
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When replacing the battery, never use metal tools - they can pierc the battery and cause a short circuit.
8.Extra tips: how to extend the life of the battery
To make a new (or calibrated) battery last longer, follow these rules:
- 🔌 Charge your phone to 80-90%, not 100% (this reduces wear and tear).
- 🌡️ Avoid overheating (do not leave your phone in the sun or near the battery).
- 🔋 Use the original RAM (or certified with Quick Charge 3.0 support).
- 📵 Turn off mobile data and Wi-Fi at night (or turn on “On the plane” mode»).
It is also useful to disable unnecessary functions:
- In Settings → Special features turn off “Gests” and “Voice Assistant”.
- In Settings → Applications → Autostart disallow autostart of unnecessary programs.
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If you rarely use doubles SIM-map, disable the second in the settings (Settings) → SIM-Maps and mobile networks. The second module consumes energy even in standby mode.