Why Xiaomi Redmi is charging too long: a full analysis of the causes and solutions

You connected Xiaomi Redmi to charge, but the percentage of the battery crawls like a turtle, and instead of the usual 1-2 The hours to fully charge are gone 4, 5 or 6 This problem is familiar to many owners of smartphones brand - from budget Redmi 9A to the flagship Redmi Note 12 Pro+. V 80% In cases of slow charging is not associated with a battery breakdown, but is caused by software settings, faulty accessories or firmware features MIUI.

In this article, we will not just list the possible causes, but analyze them with reference to specific Redmi models, show how to diagnose the problem for the first time. 5 We'll give you a checklist to fix each of these, and we'll focus on the hidden factors, like why, after the update, we'll do it. MIUI 14 on the Redmi Note 11 charging may slow down 30-40% You will also learn which apps steal current while charging and how to turn off the power-consuming functions that Xiaomi does not mention in the official instructions.

1. Problems with charger or cable

The first thing to check is the components, and even if you use Xiaomi's "native" power supply, it could have failed. 10 Pro original adapter on 33 W often overheats after a year of operation, which leads to a drop in power output to 10-15 And cheap cables with AliExpress lose to 50% wire-resistance.

How to check:

• 🔌 Connect your phone to another power supply (preferably with Quick Charge support) 3.0/4.0 or PD). If the charging went faster, the problem is the adapter.
• 📱 Try charging another phone with your unit. If it's charging slowly too, the unit is faulty.
• 🔍 Check the cable for damage: bending, melting, broken contacts, especially the vulnerable spot near the connector. USB-C.
• 📊 Use the Ampere app (available on Google Play) to measure the actual charging current. For Redmi with fast charging support, the norm is 1500-2500 mA. If it shows 500-800 mA, the cable or unit is faulty.

⚠️ Warning: Do not use power supplies from laptops or tablets with output 5V/2A They're not going to hurt the phone, but they're going to charge in the Fast Charge. 2-3 Slower due to incompatibility of protocols.

Battery wear: how to check and what to do

Lithium-polymer batteries in Xiaomi Redmi are designed for 500–800 And then the capacity starts to fall, and the charging time goes up. 8 through 2 The actual battery capacity may decrease with 5000 mil 3500–4000 This automatically increases the charging time by 20-30%.

How to diagnose wear:

1. Go to Settings. → Battery → Battery status (on some models path: Settings) → The phone. → Version. MIUI → Press "Core" 5 times, then select Battery Health).
2. Look for capacity or battery health, and if it's below 80 percent, the battery is critically worn out.
3. Use the AccuBattery app (a free version available on Google Play) to show the actual capacity and number of charging cycles.

What to do:

• 🔋 If the capacity has fallen below 70%, the battery must be replaced. In Xiaomi service centers, the original battery for Redmi is changed for 1500-3000 ₽ (model-wise).
• 🔄 Try battery calibration: completely discharge the phone before turning off, then charge to 100% No breaks. 2-3 once.
• ⚡ Avoid charging to 100% and discharging below 20% – this will prolong the life of the battery.

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If the phone is turned off when 10-15% Charging is a sure sign of battery wear, even if the charging time has not yet increased.

3. Programmatic limitations MIUI: latent energy settings

MIUI It has several "hidden" features that artificially limit the charging speed. MIUI 12–14 By default, the “Optimized Charging” mode is enabled, which slows down charging after 80% Also, the background processes of some applications (for example, Facebook or TikTok) can consume up to 300–500 during charging, which increases the time of 20-30%.

How to disable restrictions:

1. Go to Settings → Battery → Battery settings.
2. Turn off the option “Optimized Charging” (may be called “Battery Protection”).
3. Turn on “Fast Charging” (if available for your model).
4. Go to Settings. → Annexes → Permits → Autorun and disable autorun for unnecessary applications (especially instant messengers and social networks).

For advanced users:

• 🛠️ Use it. ADB-command to disable background activity: adb shell dumpsys deviceidle force-idle (requires enabled debugging by USB).
• 📱 Install Greenify (requires root) to “sleep” energy-consuming applications.

4.Overheating phone: why it slows charging

If the body temperature of Xiaomi Redmi exceeds 40-45°C, the system automatically reduces the charging current to avoid damage to the battery:

• 🔥 Games or heavy apps (e.g. Genshin Impact or PubG Mobile at maximum settings).
• ☀️ Charging under direct sunlight or in a stuffy room.
• 📱 Temperature sensor malfunctions (frequent issue in Redmi Note) 8/8 Pro).
• 🔋 Battery defect (swelling, internal short circuits).

How to check the temperature:

1. Install the AIDA64 or CPU Monitor app.
2. Look at the temperature of the battery and processor while charging. Normal - up to 35-38°C.
3. If the temperature is higher 40°C - let the phone cool down 15-20 minutes before charging.

⚠️ Warning: If the phone is heated to 50°C+ Even without a load, it's a sign of a battery or motherboard malfunction!

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Before charging, close all applications through the recent → Clean everything and put your phone into Energy Saving mode (in battery settings). 10-15%.

5. Connector problems USB-C or contact

Connector. USB-C Dust, moisture or mechanical damage can lead to poor contact, which will cause the phone to define charging as “slow” (for example, a phone will define charging as “slow, 5V/1A instead 9V/2A). This is especially true for Redmi models. 9 Redmi Note 9S, wherein the connector has no protection against debris.

Signs of a connector problem:

• 🔌 Charging is interrupted at the slightest movement of the cable.
• 📱 The phone defines charging as “slow” even with a block. 18/33 Watt.
• 🔍 Visible contamination or oxidation of contacts inside the connector.

How to clean the connector:

1. Turn off the phone and remove it. SIM-map.
2. Take a wooden toothpick (not metal!) and carefully remove the debris from the connector.
3. Moisten the cotton swab in isopropyl alcohol (90%+) and wipe the contacts.
4. Let the connector dry. 10-15 minutes before charging.

If cleaning didn’t work, the connector could be mechanically damaged, requiring replacement (service cost: 1000-2500). ₽ model-wise).

6. Impact of firmware and updates MIUI

Updates MIUI not always optimized for stable charging operation, for example, after upgrading to MIUI 14 Many users of the Redmi Note 11 Pro+ faced with the fact that the phone stopped charging faster than 15 watts, although the unit supports 120 watts.

How to check the impact of the firmware:

• 📱 Look at the version. MIUI In Settings → The phone.
• 🔍 Search online for reviews about your model + The firmware version (e.g. Redmi Note 10 Pro) MIUI 14.0.5 slow charge»).
• 🔄 If the problem is massive, try to roll back to the previous version. MIUI via Fastboot or wait for the patch.

Solutions:

• 🔧 Reset the settings to factory (Settings) → Additionally. → Recovery and reset. Attention: this will delete all data!
• 📲 Install custom restoration (TWRP) And run the clean version. MIUI (For example, xiaomi.eu).
• 🔋 Turn off Adaptive Charging in the battery settings (if any).

7.Background processes and “energy-extreme” applications

Some applications continue to work actively even while charging, consuming current and slowing down the process.

• 📱 Facebook and Instagram – up to 200-400mA in the background.
• 🎮 Cloud-saving games (such as Call of Duty Mobile) up to 500mA.
• 📍 Applications with permanent geolocation (Yandex.Maps, Google Maps) – up to 300 mA.
• 🔄 Auto-update apps in Google Play – up to 150-200 mA.

How to find and disable energy sources:

1. Go to Settings → Battery → Battery Use.
2. See what applications have consumed power in the past 24 hours.
3. Turn off background activity for unnecessary apps: Settings → Annexes → Application management → [select the application] → Battery → Limit background activity
4. Turn on the “Energy Saving Mode” during charging.

⚠️ Note: Do not disable background activity for system applications (e.g., Google Play Services) or «MIUI Daemon – This can cause the phone to malfunction.

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If you charge your phone at night, turn on “Flight Mode” – this will speed up charging on the phone. 20-30% by disconnecting communication modules.

8. Hardware malfunctions: when you need help from the service

If all the software methods have been tried and the Xiaomi Redmi is still charging for too long, the problem may lie in the hardware:

• 🔋 The motherboard's power controller is responsible for the distribution of current. If it malfunctions, the phone can only charge 5 watts.
• 📱 Charging chip (e.g., charger chip, BQ25890 Redmi Note 8 Pro – when it fails, it blocks fast charging.
• 🔌 Damaged tracks on the board - can appear after falling or getting moisture.

Signs of hardware malfunction:

• The phone is charged only when it is off.
• The swelling is fast (and slow)
• The phone does not identify the original power supply.
• On the screen, a message appears: “Charger is not supported”.

Cost of repair in the service center:

If your Redmi is warranty, don’t try to repair it yourself! contact the Xiaomi Authorized Service Center (the list can be found on mi.com).

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If the phone stopped charging after falling or getting moisture - don't turn it on! this can lead to a short circuit and a complete failure.

FAQ: Frequent questions about Xiaomi Redmi’s slow charging