Introduction: When “long” is abnormal
Did you plug a Xiaomi Redmi Note 12 or POCO X5 Pro into charging in the evening and find that the battery is only 60 percent charged in the morning? Or does a 67W fast charger get 100 percent in 2+ hours instead of the promised 40 minutes? Slow charging is one of the most annoying problems Xiaomi owners have, and it rarely happens "just like that." 90 percent of the time, either hardware malfunctions or software bugs that can be fixed on their own are to blame.
But before you bring your phone to the service, let's figure out what counts as a normal charging speed for your model. For example, Xiaomi 13 Ultra with an adapter. 90W You should get 50% in 12 minutes, and Redmi should get 50%. A2 s 10W-If your performance is 30% or more worse, this is a reason for diagnosis.In this article, we will analyze 7 key reasons for slow charging Xiaomi, including hidden settings. MIUI, which affect the speed, and we will give a checklist to check each item.
1. Problems with the cable or power adapter
The most common, but also the most common, reason is unoriginal accessories: Xiaomi is heavily using proprietary charging protocols (like Quick Charge 3+ or HyperCharge), which require certified cables. A cheap no-name USB-C cable can physically fit the connector, but only transmit 5W instead of 33W.
How to check:
- 🔍 Check the cable for insulation damage or inflections at the connectors. Microcracks often cause voltage to drop.
- ⚡ Try charging your phone with an original adapter from another Xiaomi model (e.g., from Mi 11 to Redmi Note 10).
- 📱 Connect the cable to a PC or power bank – if the charging speed has dropped dramatically, the adapter is the problem.
Tip: Settings menu → Battery → Battery status in MIUI shows the current charging power (in watts). If there is a zipper icon, but a number below 10W, the cable or power supply is to blame.
2.Contaminated USB-C connector or contacts
Dust, pocket pile or contact oxidation in a USB-C connector can reduce charging speeds by 40-50%, especially for models without IP53 protection (such as the Redmi 9A or POCO M4 Pro).
How to clean the connector:
- Turn off the phone and get it out. SIM-map.
- Light up with a flashlight – if you see debris, carefully remove it with a plastic toothpick (NOT metal!).
- For oxidized contacts, use alcohol wipes (do not overdo it with moisture!).
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Never blow into the connector with your mouth – saliva contains acids that accelerate the corrosion of contacts.
Warning: If the phone stopped detecting the cable after cleaning, you may have damaged the contacts. ~1 500–2 500 ₽ service).
Battery wear: when the battery 'ages'
Xiaomi's lithium polymer batteries degrade after 300 to 500 charge cycles, and when worn over 60%, the capacity drops, and the charging time increases 1.5 to 2 times.
- 📊 Settings menu → Battery → Battery status (B) MIUI 14+ display).
- 🔧 From the engineering menu: enter ##4636## → «Battery information. Health should be close to 100.
- 🛠️ Applications like AccuBattery (shows real capacity vs passport).
| Level of wear and tear | Symptoms | Recommendations |
|---|---|---|
| 0–20% | Charging 5-10% slower | Battery calibration (discharge to 0% → charge to 100%) |
| 20–50% | Charging time increased by 30-50% | Limit heating, avoid full discharges |
| 50%+ | Charging takes 4+ hours, the phone turns off at 20% | Replacement of the battery (cost) ~2 000–4 000 ₽) |
Important: if the battery is swollen (see the raised screen or warping of the case), immediately disconnect the phone from charging and contact the service.
4.Overheating: The Hidden Charging Speed Killer
Xiaomi automatically limits the charging current at a battery temperature above 40°C. This may be due to:
- 🔥 Using your phone while charging (games, videos, navigation).
- ☀️ Charging under direct sunlight or in a stuffy room.
- 🚫 Failure of the power controller (frequent problem with the POCO F3 redmi K40).
How to check the temperature:
- Install the AIDA64 application.
- Go to the Sensors section.
- Compare the Battery Temp with the norm (optimally 25-35°C).
What to do if the phone warms up even without load?
Tip: If you’re playing Genshin Impact or PUBG Mobile while charging, turn on the Game Turbo mode in MIUI – it optimizes heat distribution.
5. MIUI Software Limitations
Xiaomi’s proprietary shell has several “hidden” features that can artificially slow charging:
- 🔋 Optimized charging (Settings) → Battery → Optimized charging: Limits charge to 80% to extend battery life.
- ⚡ Power saving mode: when activated, reduces the charging power to 5–10W.
- 🛡️ Background activity: Some apps (like Facebook or TikTok) consume up to 20% of the power during charging, slowing down the process.
How to disable restrictions:
- Go to Settings → Battery → Battery settings.
- Turn off Optimized Charging and Power Saving Mode.
- In the Battery Use section, check which apps are active and pause the unnecessary ones.
Turn off optimized charging | Turn off power saving mode |Close background applications |Update MIUI to the latest version |Reset battery settings (in the engineering menu)
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6. Failures of the power controller or board
If all the previous paragraphs did not help, the problem may lie in the hardware:
- 🔌 Charging controller (a common problem with Xiaomi Mi 9 and Mi 10 after falls).
- 🔄 Damaged tracks on the motherboard (for example, after moisture hits).
- ⚡ Faulty connector USB-C (feed-in VBUS or GND back off).
Signs of hardware malfunction:
- The phone is charged only when it is off.
- The swelling is then turned off (and then turned off).
- The adapter warms up to 60°C+ 5 minutes after connection.
⚠️ Warning: If the phone is charging and it makes an error This charger is not supported, DO NOT ignore it, this may indicate a short circuit in the power controller that will cause the motherboard to fail (repair costs 5,000-15,000). ₽).
7. Impact of firmware and MIUI updates
Sometimes slow charging is associated with bugs in the firmware. For example, after upgrading to MIUI 14, owners of the Xiaomi 12T complained about a drop in charging speed from 120W to 30W.
- 🔄 Reverse to the old version MIUI (If the problem has occurred after the update).
- 🛠️ Resetting settings through Settings → The phone. → Resetting settings (does not delete data, but resets battery settings).
- 📥 Manual installation of the patch through MIUI bootloader (for experienced users).
How to check the firmware version:
- Go to Settings → About Phone → MIUI version.
- Compare this to the latest stable builds on en.miui.com.
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If your phone starts charging more slowly after the MIUI update, try resetting the battery settings first, which solves the problem 60 percent of the time without rolling back the firmware.