Slow charging Xiaomi Redmi Note 8 Pro: causes and solutions

Xiaomi Redmi Note 8 Pro is famous for its performance and durability, but over time, many users face a problem: the smartphone charges incredibly slowly. If before the battery was filled in 1.5-2 hours, now the process stretches for 4-5 hours or even stops by 80%.

In this article, we'll look at all the possible causes, from the usual wear of the cable to the hidden firmware settings, how to diagnose the problem, which components to check first, and what to do if standard methods don't work. Spoiler: 80 percent of the time, it's not the battery that's to blame, but the software or peripherals.

Important: Before you bring your phone to the service, try all the methods suggested — many of them require no special skills and take no more than 10 minutes. And if you have already changed the battery or firmware, pay special attention to the sections on battery calibration and energy saving settings.

1. Checking of charger and cable

Start with the simplest: inspect the power supply and cable. Even if they look holistic, micro-damage can reduce charging current by 2-3 times. Redmi Note 8 Pro supports fast 18W charging, but you need original or certified RAM.

How to check:

• 🔌 Connect your phone to another charger (preferably the original one from Xiaomi with the tagging). MDY-11-ED or MDY-11-EU).
• 📱 Try charging another phone with the same cable - if it's charging slowly too, the cable is a problem.
• 🔍 Check the connector. USB-C on the phone: dirt, oxidation, or bent contacts can block normal contact.

Pay attention to the power supply. If you use 5W RAM (from older smartphones), the Redmi Note 8 Pro will charge 3-4 times slower. Also avoid cheap "no-name" cables - they often do not support the Quick Charge 3.0 protocol necessary for fast charging.

2.Diagnostics of USB-C port and contacts

The USB-C connector is one of the most vulnerable spots in the Redmi Note 8 Pro. Dust, moisture, or mechanical damage causes poor contact, which either causes the phone to not charge at all or does so extremely slowly.

1. Turn off your phone and light the connector with a flashlight, and if you see dirt, dust or oxidation inside, you need to clean it.
2. Carefully clean the port with a wooden toothpick (not metal!) or compressed air.Do not use alcohol or liquids - they can damage the contacts.
3. Check if the connector is wobbling when you connect the cable, and if you have backlash, it's a sign of mechanical wear and tear, and the port needs to be replaced.

If the problem persists after cleaning, try to move the cable slightly in the connector during charging. If the current appears, then it disappears - this confirms the malfunction of the port, in which case you will need to replace the connector (repair costs - from 800 to 1500 rubles depending on the service).

3. Power saving settings and application background

MIUI is known for aggressive battery optimization, which sometimes blocks normal charging, especially after system updates.

• 🔋 Go to Settings. → Battery and productivity → Battery settings and disable Super Power Saving mode".
• 📱 In the Settings section → Annexes → Permits → Auto-run ensure that system applications (such as Security or Miui Daemon) are not blocked.
• 🔄 B Settings → Battery → Select “High Performance” mode (this will temporarily disable charging restrictions).

Also check to see if night charging mode (Settings → Battery → Night charging) is on, which limits the charge to 80% at night, but sometimes gets knocked down and runs around the clock.

Turn off "Super energy saving"|Select the “High Performance” mode"|Check Auto-Run System Applications|Turn off "Night Charging" (if not in use)|Reboot your phone after the changes-->

A critical feature of the Redmi Note 8 Pro: if the system is enabled with the developer mode and activated the option "Do not turn off the screen while charging", the phone can charge 30-40% slower due to overheating of the screen. → Additionally. → For developers.

Calibration of the battery and resetting of settings

If the phone shows the wrong percentage of charge (for example, jumps from 50% to 20%) or the charging stops by 80-90%, the problem may be in the desynchronization of the battery controller.

1. Discharge the phone before automatically switching off (0%).
2. Connect the original RAM and charge for at least 8 hours without interruptions (even if the indicator shows 100%).
3. Turn off charging, turn off the phone for 5 minutes, then turn on and check the real percentage of charge.

If calibration does not help, reset the battery settings:

1. Go to Settings → About Phone → MIUI version and tap 7 times on the line to activate the developer mode.
2. Return to Settings → Additional → For developers and find the option “Reset battery statistics”.
3. Confirm the reset and restart the phone.

After resetting, the battery controller is retrained for 2-3 charging cycles, during which time avoid full discharge and use only the original RAM.

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If the phone still charges up to 80% after calibration and stops, check the battery temperature in the AccuBattery app (available on the Play Market). If the temperature exceeds 40°C, the battery automatically limits the charge for safety, in which case let the phone cool down before charging.

Checking the status of the battery

The average battery life of the Redmi Note 8 Pro is 2-3 years (or 500-800 charge cycles), after which the capacity drops by 20-30%, and the charging time increases.

For diagnosis, use the applications:

• AccuBattery - shows the real capacity, wear and temperature.
• AIDA64 displays the voltage, battery technology and cycle count.
• MIUI Battery Care (built-in) – analyzes the energy consumption of applications.

If the battery capacity has fallen below 70% and the charging time exceeds 4 hours, the battery needs to be replaced. Don’t delay it: the worn-out battery can swell and damage the motherboard (repair will cost 3-5 thousand rubles).

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Replacing the battery in the Redmi Note 8 Pro costs 1200-2000 rubles (depending on the quality of the battery).Always ask for the service original battery labeled BM47 - cheap analogues are 2-3 times less and may not support fast charging.

6. Software glitches and MIUI updates

Sometimes slow charging is due to firmware errors, such as after upgrading to MIUI 12.5+, many users complained about artificially limiting charging current.

• 🔄 Reset the settings to factory (Settings) → The phone. → Settings reset. Attention: this will delete all data, so back up.
• 📲 Install the latest firmware version through Settings → System update. If the update doesn't come, download it manually from en.miui.com.
• 🛠️ If the problem occurs after the update, roll back to the previous version. MIUI using Fastboot (instruction below).

For firmware rollback:

1. Download the MIUI version for Redmi Note 8 Pro (codename begonia) from the Xiaomi Firmware Updater website.
2. Unpack the archive and move the update.zip file to the root of the phone’s memory.
3. Go to Settings → About Phone → System Update → Three Points (menu) → Select an update file.

If the charge normalized after resetting or updating, the problem was in the software. Otherwise, look for the cause in the hardware (battery, port, power controller).

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Before resetting, check to see if custom firmware (such as Pixel Experience or LineageOS) is installed on the phone, which often conflicts with Xiaomi’s original charging controller and requires a separate kernel setup.

7.Inspection of the power controller and motherboard

If all previous methods failed, the problem could be a power controller (PMIC) or a motherboard damage, the most difficult and expensive to repair faults.

• The phone does not charge from any cable/ROM, but determines the connection.
• Charging is only in the off state.
• The phone spontaneously turns off when connected to the network.
• The battery is discharged in a few hours, even in standby mode.

Diagnosis and repair:

1. Chain vertebrating: the service will check the integrity of the tracks from the USB-C connector to the power controller.
2. PMIC replacement: If the chip burns out (often due to power surges), it is soldered to a new one, costing 2000-4000 rubles.
3. Diagnosis of the board: sometimes corrosion or microcracks after falls are the cause.

It is not recommended to repair the board yourself - without experience, you can damage other components. Contact the service with good reviews and request a multimeter diagnosis.

8. Alternative charging methods

If standard charging is still slow, try alternative methods:

• 🔌 Wireless charging: Redmi Note 8 Pro does not support it out of the box, but you can buy an adapter with a Qi receiver (cost) ~500 rubles. The speed will be lower (up to) 10W), But it's better than 1–2W damaged-port.
• 💻 Charging from USB-PC port: suitable for emergencies, but current is limited 0.5A (slowly).
• ⚡ Power Bank with Quick Charge support: some external batteries (for example, Xiaomi Mi Power Bank 3 Pro) give current up to the current 18W, Which is comparable to the original ZU.

You can also try charging in the off state:

1. Turn off the phone.
2. Connect the original RAM.
3. Wait 30 minutes – sometimes when the battery controller is off, it resets the restrictions.

If neither method worked, there are two options: replacing the battery or switching to another phone. Note that the Redmi Note 8 Pro Released is in 2019, and its battery is already approaching its life limit.

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Before buying a new battery, check if you plan to change your phone soon. If so, it may not be advisable to replace the battery – it is better to invest in a new device with support for fast charging 30W+ (for example, the Redmi Note 12 Pro+).

FAQ: Frequent questions about charging Redmi Note 8 Pro