Why Xiaomi’s smartphone charges slowly: all the reasons and solutions

You've connected Xiaomi to charging, but battery percentage crawls like a turtle, even though it used to charge in an hour? This problem is familiar to many owners of the brand's smartphones, from budget Redmi to flagship Xiaomi 14. Slow charging is not always associated with battery wear: 70% of the time, the settings, cable or power supply are to blame. In this article, we will analyze all possible causes, from banal to hidden, and give a checklist for diagnostics and ways to speed up charging to factory figures.

Xiaomi’s feature is that it actively limits charging speeds through software algorithms (such as “Adaptive Charging” in MIUI or “Steep Charging” in POCO) that extend battery life but often fail. Plus, the brand’s smartphones are sensitive to accessory quality: even the original Redmi Note 10 cable may not give full power when connected to the Xiaomi 13 Pro.

Before you bring your phone to the service, check out 3 key points:

• 🔌 Power supply: does it support Quick Charge/Turbo Charge for your model?
• 📱 Port port USB: Is there any debris or mechanical damage inside?
• ⚙️ Settings MIUI: Are energy saving regimes activated?

1. Unoriginal or damaged cable

The most common reason is low-quality cable. Even if it is visually intact, the inner veins could be rubbed or oxidized. Xiaomi uses amplified cables in flagships (for example, Xiaomi 13T) to transmit current up to 10A, and cheap counterparts can withstand a maximum of 2-3A. The result: instead of the promised 120W, the phone gets 10-15W.

How to check:

• 🔍 Check the cable for the clogs (especially at the connectors).
• 📊 Connect to another device – if there is also a slow charging, the cable is faulty.
• 🛠️ Check the resistance with a multimeter (normal for the USB-C: 0.5-1.0 Om).

Importantly, even the original Redmi 9 cable won’t work for the Xiaomi 12S Ultra, because they have different fast charging protocols.

⚠️ Attention: Ferrite ring cables (thickening in the middle) often choke current. If your cable is equipped with it, try replacing it with a model without a filter.

2. the power supply does not meet the requirements

The power supply (ROM) should support the fast charging protocol your Xiaomi uses, such as:

• Redmi Note 11 – Quick Charge 3.0 (up to 33W)
• Xiaomi 13 Pro – HyperCharge (up to 120W)
• POCO F5 – Turbo Charge (up to 67W)

If you use RAM from another device (such as a laptop or an old Samsung), the phone will automatically limit power to 5-10W. Check the current charging speed in the Settings → Battery menu (section “Charging status”).

Critical error: Using a RAM with power above a supported phone (e.g., 120W for the Redmi Note 10) won't speed up charging, but can damage the power controller.

3.Contaminated or damaged USB-C port

The USB-C port in Xiaomi is often clogged with dust, pocket pile or oxidized by moisture, which leads to unstable contact, and the phone limits current to 0.5-1A for safety.

• 🔄 Charging is interrupted when the cable moves.
• 📉 Speed drops 5-10 minutes after connection.
• 🔋 The phone shows a message saying "Slow charging».

How to clean the port:

1. Turn off your phone and get the SIM cards.
2. Light the port with a flashlight and remove the garbage with a plastic (not metal!) toothpick.
3. Blow the port with compressed air (cylinder for equipment).
4. If there is oxidation, wipe the contacts with alcohol (70% or higher).

⚠️ Warning: Do not use cotton cotton cotton or cotton swabs - the villi will remain inside the port. If the contacts are bent, do not try to straighten them yourself: this may be a charge-free.

4. MIUI Program Restrictions

MIUI aggressively optimizes power consumption, which sometimes interferes with charging.

• 🔋 Adaptive charging (Settings) → Battery → Battery settings: Limits current to 80% if the phone is on a long charge (e.g. at night).
• ⚡ Power saving mode: forcibly reduces the charging power to 5W.
• 🛡️ Battery protection (in some models): blocks fast charging at high temperatures.

How to disable restrictions:

1. Go to Settings → Battery → Battery settings.
2. Turn off Adaptive Charging and Battery Protection.
3. In the Energy Saving section, select the Performance mode.
4. Reboot the phone.

Important: Some models (e.g. Xiaomi 13 Ultra) have these settings hidden. To unlock them, type ##4636## in the Phone app, select Battery Information, and reset the stats.

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If the phone warms up after switching off adaptive charging, use a cooling stand or reduce the brightness of the screen while charging.

5. Wear of the battery or power controller

Lithium-ion batteries degrade over time, and after 300 to 500 charging cycles, their capacity drops by 20 to 30 percent, and their charging speed decreases by a factor of 2-3.

• 📊 Settings menu → Battery → Battery status (reveals "Battery Health" as a percentage).
• 🔧 Through applications like AccuBattery (shows real capacity vs. factory capacity).

Critical signs of wear and tear:

• 🔋 The phone discharges in 2-3 hours without load.
• 📉 Charging stops at 80-90% and does not go further.
• 🔥 The body heats up strongly when charging.

If the battery is below 70%, it needs to be replaced. In Xiaomi service centers, the original battery costs between 2,000 and 5,000 rubles (depending on the model).

⚠️ Warning: If the phone suddenly shuts down with 20 to 30% charge, it is a sign of a malfunction of the power controller.

6. Phone overheating

Xiaomi automatically reduces the charging speed if the battery temperature exceeds 40-45 ° C. This protects the battery from degradation, but can stretch the charging process to 3-4 hours.

• 🌡️ Charging under direct sunlight.
• 🎮 Games or video rendering while charging.
• 🔥 Use of a cover with poor thermal conductivity.
• 🚫 Charging in a room with a temperature above 30°C.

How to avoid overheating:

• 🧊 Remove the case while charging.
• 📵 Do not use your phone for resource-intensive tasks (games, video shooting).
• 🌬️ Charge in a ventilated room (not in a car in the sun!).
• 🔄 If the phone is heated, disconnect it from charging for 10-15 minutes.

Tip: For flagships (Xiaomi 13/14, Black Shark), use active cooling – for example, a fan for a laptop aimed at the body.

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If the phone is heating up even without charging, check the background processes in Settings → Apps → Autostart. Disable unnecessary programs consuming the CPU.

7. Problems with firmware or updates

Sometimes slow charging is associated with MIUI bugs.For example, after upgrading to MIUI 14, many Redmi Note 11 Pro users complained about the drop in speed from 67W to 18W.

• 🐛 Error in the power controller driver.
• 🔄 Conflict with custom settings (for example, after root access).
• 📥 Incomplete firmware update.

How to fix it:

1. Check for updates in Settings → About Phone → System Update.
2. If the problem has occurred after the update, roll back to the previous version of MIUI via Fastboot.
3. Reset the settings to factory (Settings → Additional → Reset), but first make a backup!

For advanced users: If you are sure that the problem is in the firmware, you can flash custom recovery (for example, TWRP) and install a clean version of MIUI. Instructions are available on the 4PDA or XDA Developers forums.

External factors: socket, extension, power bank

Even with the original RAM, charging can be slow due to:

• 🔌 Weak sockets: Old wiring or congested network reduces voltage.
• 🔗 Extension: cheap models “eat” up to 30% of power.
• 🔋 Power Bank: Most external batteries give a maximum of 10–18W.

How to check:

• Connect the ROM directly to the socket (without the extension).
• Try another outlet (preferably with grounding).
• Use a power bank with Quick Charge support (e.g. Xiaomi Mi Power Bank 3 Pro).

Lifehack: If you charge from USB-port of PC/laptop, include in BIOS "Always On" mode USB» — This will increase the power output from 0.5A 1–2A.

FAQ: Frequent questions about Xiaomi's slow charging