You've connected Xiaomi to charging, but the percentage of the battery crawls like a turtle? Instead of the usual 1-2 hours to fully charge takes 4, 5 or even more? Slow charging is one of the most common problems among owners of smartphones Redmi, POCO and Mi. In 80% of cases, it can be eliminated by yourself without going to the service center. But first you need to understand what exactly slows down the process.
In this article, we'll look at all the possible causes, from the cluttered wear of the cable to the hidden settings that eat up the charging power, how to check each element of the circuit (from the socket to the battery), what MIUI settings affect speed, and when it's really time to carry the phone for repair, and at the end, a checklist for quick diagnostics and answers to frequent questions.
1. Charger problems: how to check the power supply and cable
To start with, the most obvious is that the charger and the cable are the first candidates for culprits. Even if they look holistic, internal damage can reduce power by 30-50%. For example, a worn overflight of the cable often leads to loss of contact inside, and cheap power supplies do not produce the declared 18W or 33W.
How to diagnose:
- 🔌 Try another power supply with the same or more power, for example, if you have a Redmi Note 10 Pro (supports). 33W), charge off POCO F3 Mi 11.
- 🔗 Replace the cable with original or certified (marked) USB-IF). Chinese "no-name" cables often have thin veins that can't withstand high currents.
- 📊 Check the power output through the Ampere app (available on Google Play).If there's less current when connecting to charging 1.5A, The problem is exactly in the block or cable.
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The original Xiaomi chargers are labeled MDY-XX-XX (where XX is the digits), and counterfeits are often labeled MID-XX-XX or unlabeled.
Pay special attention USB-If you have to "seek position" when you connect the cable to start charging, that's a sign of a loose connector or oxidized contacts, and then cleaning with alcohol may help temporarily, but in the long run, you'll need to replace the port.
Battery malfunctions: how to determine wear
Xiaomi batteries lose up to 20% of their capacity after 500 charging cycles (approximately 1.5-2 years of active use). A worn-out battery not only discharges faster, but also charges more slowly - the controller limits the current to avoid overheating. If your smartphone is older than 2 years, the problem is likely to be in it.
How to check the status of the battery:
- Go to Settings → Battery → Battery condition (on some models, the path may be different).
- If you look at Capacity or Wear, if the capacity is below 80 percent of the original capacity, you should change the battery.
- Use the AccuBattery app (available on Google Play) for a detailed diagnosis, which will show real capacity, temperature and wear rate.
What is a "charging cycle"?
Additional signs of a worn-out battery:
- 🔥 The phone warms up during charging (over 40)°C).
- ⚡ Charging is interrupted by 80-90% (heat-proof).
- 📉 The percentage of the battery jumps (for example, from 30% to 10 at once%).
⚠️ Warning: If the battery is swelling (the phone body is bulging), stop using immediately! This is dangerous - the risk of fire or explosion.
3. Software Influence: MIUI and Background Processes
MIUI is known for its aggressive power management, sometimes limiting charging to extend battery life, and may be the culprits in the background, which use the processor to keep the phone awake while charging.
What to check:
- 🛠️ Turn off charging optimization: Go to Settings → Battery → Battery settings. Turn off Adaptive Charging or Optimized Charging.
Close the background applications
- Open the recent apps and brush off all the unnecessary ones.
- Go to Settings → Applications → Application Management and disable auto-start for unnecessary programs.
- 🔄 Update. MIUI There were power control bugs in the old firmware.
Another hidden charger is the developer mode, and if it's on and the Do Not Turn off option is active, the phone will use energy to light up the display even while charging, to turn off:
Settings → About the phone → MIUI version (shap 7 times)
Settings → Additional → For developers → Do not turn off the screen (turn off)4.Overheating phone: why high temperature slows charging
Lithium polymer batteries don't like high temperatures. When heated above 40°C, the charging controller automatically reduces the current to avoid damage.
| Cause of overheating | How to check | Decision |
|---|---|---|
| Using your phone while charging (games, videos) | Touch the case – if it is hot, and charging is 1-2% per minute, it is the case. | Do not use your phone while charging or lower the brightness of the screen. |
| Direct sunlight or a hot room | Check the temperature in the Ampere or CPU Monitor app | Charge your phone in a cool place, avoid the sun |
| Failed battery or power controller | The phone is warming up even in standby mode. | Diagnostics at the service center |
| Viruses or Mining Bots | Check the CPU boot in Settings → Applications → Processes | Scan your phone with an antivirus (such as Malwarebytes) |
If the phone is heating up even without a load, try resetting to factory settings (pre-backup!).
Settings → About the phone → Reset settings → Reset all settings⚠️ Warning: If after the reset the problem remains, and the phone continues to warm - it is a hardware malfunction (power controller, battery or motherboard!
5.Problems with USB-C connector: oxidation, pollution, mechanical damage
The USB-C connector in Xiaomi smartphones is one of the most vulnerable places, and the dust, moisture, and frequent cable connections/disconnections lead to:
- 🔌 Oxidation of contacts - a film is formed that worsens conductivity.
- 🧲 Connector looseness – cable is poorly fixed, contact is interrupted.
- 💥 Short circuit – if liquid or metal debris gets inside.
Turn off the phone and remove it. SIM-map
Prepare a toothpick and isopropyl alcohol
Carefully remove dirt without pressing
Dry the connector for at least 10 minutes
Check charging only after complete drying-->
If the problem persists after cleaning and the connector wobbles, it will have to be replaced. The cost of repairs in Xiaomi service centers starts from 1,500 rubles (depending on the model), self-replacement can damage the motherboard!
6. Non-original accessories and "smart" sockets
Many users save on accessories by buying cheap cables and power supplies, but non-original chargers often don’t meet the Quick Charge or USB-PD standards, which makes the phone charge 2-3 times slower.
What's important to know:
- 🔋 Power units must support protocols: Quick Charge 3.0/4.0 (pre-model 2020 year-end). USB Power Delivery (PD) (For new smartphones, for example, Xiaomi 12T or Redmi K50).
- 🔌 Cables must be certified USB-IF (packaging).
- 💡 "Smart sockets or extension cords with USB-Ports often provide insufficient current (1A instead 2A).