You plugged Xiaomi into charging, but instead of the usual 30-60 minutes to 100%, the phone charges for 2-3 hours? Or the indicator shows “Slow Charging” when everything used to work like a clock? This problem is familiar to many owners of Redmi, POCO and Mi smartphones — especially after a firmware update or mechanical damage. 80% of cases are to blame for problems that can be fixed by yourself without contacting the service center.
In this article, we’ll look at all the possible reasons why fast charging on Xiaomi has gone missing, from the banal wear of the cable to the hidden settings of the system. You’ll learn how to check each element of the charging chain (from the socket to the battery), what parameters affect speed, and what to do if the phone “forgot” to support Quick Charge or Fast Charging. For convenience, we have collected unique data on Xiaomi models from 2020-2026, where the problem is most common.
1.A damaged cable or adapter is the first cause of slow charging
To start with, 9 out of 10 drops in charging speeds are connected to cable or power supplies, and even if they look whole, the inner veins could be rubbed and the contacts oxidized, especially for cheap, nouneime accessories that often come with low-end models like the Redmi Note or POCO M.
How to check:
- 🔌 Try another cable (preferably original or certified) USB-C supportive 5A). If the speed returns, the cable is a problem.
- 🔋 Test with another adapter (minimum) 18W Quick Charge 3.0 or 33W Blocks from older Mi models (such as the Mi 8) may not provide the power needed for newer smartphones.
- 🔍 Look at the sleeves: the sleeves in the USB-C or black plaque on contacts - a sure sign of malfunction.
⚠️ Attention: If you use a power bank, check its power output. Many portable batteries only support fast charging at the exit, but not at the input. For example, Xiaomi Power Bank 3 Pro offers a fast charging experience. 30W, but only charge itself on 18W.
2.Contaminated USB-C connector - why the phone "can't see" fast charging
Dust, pocket pile or contact oxidation in the USB-C connector can block data transmission about supported charging protocols, which results in the phone going into emergency mode and limiting current to 0.5-1A, as when connected to a USB port of a computer.
How to clean the connector:
- Turn off the phone and remove it. SIM-card (if the connector is combined).
- Take a plastic toothpick (not metal!) and carefully remove visible debris. For hard-to-reach places, use compressed air (a canister for cleaning equipment).
- Soak the cotton swab in isopropyl alcohol (90%+) and wipe the contacts. Don't use water or wet wipes!
- Allow the connector to dry for 10-15 minutes before charging.
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If the connector still does not make good contact after cleaning, try to slightly bend the locking tongue inside the port (it often falls through frequent connection).
⚠️ Warning: Never use needles, pins or knives to clean your contacts – this can damage your contacts CC1/CC2, responsible for determining the type of connected device (depends on them whether fast charging will be turned on).
3. firmware failures: why Xiaomi "forgets" about fast charging after the update
One of the most insidious reasons is software errors after the MIUI update. For example, after the release of MIUI 14, many users of the Redmi Note 11 Pro + and Xiaomi 12T complained that the phone stopped recognizing adapters with power above 18W, although it supports 120W hardware.
How to get back a quick charge:
- 📱 Reset charging settings: Go to Settings → Battery → Battery settings. Find Reset Adapter (or Charging Optimization) and activate it. Recharge it, and the phone must identify it as a new device.
- 🔄 Reverse to the previous version MIUI (If the problem has occurred after the update: 1. Download the archive with firmware (for example, from the site) https://xiaomifirmwareupdater.com). 2. Go to Settings. → The phone. → Updating the system. 3. Click on three dots in the upper right corner → Select a firmware file. 4. Please enter the downloaded archive and wait for the process to be completed.