Why Xiaomi Charger Is Slowly Charging Your Phone: A Complete Discussion of the Reasons

You plugged a Xiaomi smartphone into a charger, but the battery fills up at turtle speed? Instead of the manufacturer's promised "50% in 30 minutes," you get 10% per hour -- and that's despite the phone not even being used while charging, POCO Or Mi, especially after a year or two of active use, but the problem isn't always with a worn-out battery.

In this article, we will discuss all possible causes of slow charging, from the banal (non-original cable) to the hidden (power controller problems), you will learn how to diagnose a malfunction without visiting the service center, what settings are at the table. MIUI It affects the charging speed, and when it's time to change the battery, and why even Xiaomi's new 67W charger can work half-heartedly.

1. Problems with charger or cable

The first thing to check is the charging kit. Even if you use Xiaomi’s original RAM, it can fail over time, especially with low-end charging models (like the Redmi Note 8 or the Redmi Note 8). POCO M3), where less secure circuits are used.

How to understand that the problem in the charger:

• 🔌 Try charging your phone with another charger (preferably the original Xiaomi charger with the same power). If the charging speed has increased, your RAM is malfunctioning.
• 📱 Connect the charger to another device (like a tablet or power bank) if it also charges slowly, the power supply is a problem.
• 🔍 Check the USB-Type C connector on charging: blackened contacts, melted plastic or the smell of burning - signs of a short circuit.

Pay special attention to cable. Cheap, non-original wires often have thin veins that can't withstand high currents. 12T Pro (120W) needs a cable with support USB 2.1 or USB 3.2, or the power will drop to 18-27 watts:

• 🔗 Are there any overburdens or breaks on the cable (especially at the base of the connector).
• 🔄 Try turning the cable over - sometimes the contacts burn on one side.
• 🛠️ If you use an extension cord or USB-hub, connect the charging directly to the socket.

⚠️ Warning: Some smart outlets or network filters limit the power of connected devices. If Xiaomi charges 33 watts and the outlet cuts the current to 1 A, the phone will charge 3-5 times slower.

Battery wear: when the battery is no longer pulling

The lithium-polymer batteries in Xiaomi smartphones are designed for 500-800 charging cycles (depending on the model). After that, the capacity begins to fall rapidly, and the charging time increases. For example, the Redmi Note 10 Pro battery after 700 cycles can lose up to 30% of capacity, and instead of 1 hour to 100%, the phone will charge 2-3 hours.

How to check the wear of the battery:

1. Open the Settings. → Battery and productivity → Battery status (by MIUI 13/14). This shows the current capacity as a percentage of the factory.
2. Use apps like AccuBattery (available on Google Play) that show real wear and tear and discharge rates.
3. If the phone turns off at 20-30% charge or heats up while charging, these are signs of battery degradation.

Critical: If the battery capacity has fallen below 70%, the system MIUI It automatically limits the charging current to 50 to 60 percent of the maximum to reduce the battery load, which is overheating protection, but it also slows down the process.

3. Software limitations: why MIUI slows charging

Firmware MIUI (Especially versions 12-14, which actively manages the charging process to extend the battery life, sometimes these "caring" features work against the user:

• 🛡️ Optimized charging (Settings) → Battery → Optimized charging. If it's on, the phone will charge up to 80% and then "get" up to 100% before disconnecting from the network. This increases the charging time by 30-50%.
• 🔋 Energy saving mode (Settings) → Battery → Power saving mode: Limits background processes, but can also reduce charging current.
• 📱 CPU overheating if the phone is over 40°C (e.g. after games), MIUI automatically reduces the charging power to 5-10 W.
• 🔄 Background updates. While downloading updates MIUI or applications system limits current, giving priority to the network.

How to disable restrictions:

1. Turn off optimized charging in the battery settings.
2. Check if the power saving mode is enabled (including for individual applications).
3. Close all background apps before charging (especially games and social media).
4. If the phone is warming, remove the case and let it cool for 10-15 minutes before connecting to charging.

⚠️ Note: On some models (Xiaomi 13 Ultra, Redmi) K60 Pro) Disabling optimized charging may cause accelerated battery wear. Use this function only when necessary.

4. Problems with USB Type C connector or power controller

If the charger and cable are working, and the battery is normal, but the phone still charges slowly - the problem may lie in the USB-Type C connector or the power controller on the motherboard.

Signs of a faulty connector:

• 🔌 Charging is interrupted if the cable is slightly moved.
• 📱 Phone determines connection/disconnection of charging for no reason.
• 🔋 Charging status displays Charging slowly even with powerful RAM.
• 🛠️ Visible damage to the connector: bent contacts, oxidation, debris inside.

How to check and repair:

1. Clean the connector from dust and debris with a wooden toothpick (not metal!). You can use compressed air (a canister for cleaning equipment).
2. Check if the contacts inside the connector are bent, and if so, bend them back carefully (preferably at a service center).
3. If the connector is shattered, it's a sign of wear and tear of the soldering. ~1 500–3 000 ₽ model-wise).

A more serious problem is a power controller malfunction (e.g. Qualcomm). PMIC or MTK PMIC). It's a chip that controls the charging and distribution of energy:

• 🔋 The phone is charged only when it is off.
• 📉 Charging power jumps (5 watts, then 18 watts for no reason).
• 🔥 The phone warms up strongly in the processor area even without a load.

In this case, you need repairs in the service center - it is almost impossible to replace the power controller yourself (a soldering station and experience with the power supply is required). BGA-chip).

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If the phone is only charging in a certain position of the cable, don't pull, it's a sign of a loss of contact, and the longer you delay repairs, the greater the risk of damage to the motherboard.

5. Effect of temperature on charging speed

Xiaomi (like other manufacturers) limits charging current at low or high temperatures to protect the battery. +10°C +35°C. When going beyond these limits, the speed drops by 2-5 times.

How temperature affects charging:

Common causes of overheating during charging:

• 🎮 Games or heavy applications (such as Genshin Impact or PUBG Mobile).
• 🌞 Direct sunlight or hot weather.
• 🔋 Battery worn out (heats even without loading).
• 🛠️ Faulty power controller (constant heating in one zone).

⚠️ Note: If Xiaomi phone heats up above 40°C during charging, MIUI Forcefully reduces power to 5-10 W. This can happen even with a new battery, if the background is resource-intensive processes.

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Charge your phone at room temperature (20–25)°C – this will speed up the process and prolong the life of the battery.

6. Software failures and firmware errors

Sometimes slow charging is not due to hardware, but to software bugs, which is especially true after updates. MIUI or a failed firmware, such as after updating to MIUI 14 Some Redmi Note 11 users complained about a drop in charging speed from 33 watts to 10 watts.

How to diagnose and fix software problems:

1. Restart your phone – sometimes background processes block normal charging.
2. Reset the battery settings: Settings → Annexes → Application management → Three dots (menu) → Reset application settings → Battery
3. Update your firmware to the latest version (Settings → About Phone → System Update).
4. If the problem occurs after the update, roll back to the previous version. MIUI (instructions are available on the forums 4PDA Xiaomi Community).

If nothing works, check the system logs for charging errors.

1. Enable the Developer Mode (Settings) → The phone. → Version. MIUI — tap 7 times).
2. Open the Settings. → Additionally. → For developers → Logs.
3. Connect the charging and watch for messages. Errors like Battery overvoltage or Charging paused will indicate a problem.

7.External factors: power bank, wireless charging

Sometimes the problem isn't the phone, it's the power supply, and here's what can slow down charging.

• 🔌 Weak socket: old Soviet sockets or extension cords may not be able to withstand high currents, for example, charging 67 watts requires an outlet with a current of at least 3 A, otherwise the power will fall.
• 🔋 Power Bank: Most external batteries give a maximum of 18-22 watts, even if you connect a phone with support for 33 watts.
• 📶 Wireless charging: Even with Qi 2.0 support (for example, on Xiaomi 13 Pro), speeds rarely exceed 10-15 watts.
• 🚗 Charging in the car: most car adapters give 5 watts (USB) Or 18 watts (Type-C). You need a special adapter for a quick charge for 30.+ Watt.

How to check:

• Connect the charging to another outlet (preferably modern, with grounding).
• Try charging your phone from a computer or laptop – if the speed is as low, the problem isn’t the outlet.
• For power bank, use models with support PD 3.0 (e.g. Xiaomi Mi Power Bank 3 Pro at 65W).

If you use wireless charging, keep in mind:

• The top speed on Xiaomi is 30 watts (only on flagships like the Mi 11 Ultra).
• On most models (Redmi Note 12, POCO X5) speed does not exceed 10-15 W.
• The phone is warmer than wired charging, so MIUI may restrict the current.

8.When is the time to bring the phone to the service

If you’ve tried all of these, but Xiaomi’s phone is still charging slowly, it’s time to contact the service center.

• 🔋 The battery is swelling (the phone is “opened”, the screen or back cover is moving away).
• 🔥 The phone warms up even without load (over 45).°C).
• 📉 The charging speed jumps (5 watts, then 18 watts for no reason).
• 🛠️ Charging works only in the off state.
• ⚡ When charging, the phone turns off or restarts.

The cost of repair in official Xiaomi services (approximately):

If the phone is warranty, do not disassemble it yourself - this will void warranty obligations. Contact the authorized service center Xiaomi (the list is on the official website).

⚠️ Warning: Some "unofficial" services install cheap analogues of batteries or controllers that can make things worse or even cause a fire. Always require certified parts.

FAQ: Frequent questions about Xiaomi's slow charging