You hooked up Xiaomi to charge, but the percentage of the battery crawls like a snail, and an hour later the screen still proudly flaunts "37 percent"? The situation is familiar to many owners of smartphones of the brand - from the budget Redmi Note to the flagship Xiaomi 13 Ultra. Slow charging is annoying, especially when time is running out and the battery goes down faster than it can recover.
In this article, we’re not going to sprinkle general phrases like “check the cable” (although that’s important), instead we’re going to look at the specific technical reasons why Xiaomi might be slowing down charging, from hardware constraints to hidden MIUI settings that you didn’t know about, and we’re going to check out the actions that will speed up charging by 30 to 50 percent today without buying a new adapter.
Spoiler: 60 percent of the time, it's not the smartphone itself, it's the combination of external factors. And no, battery wear isn't always the main problem. Let's dig deeper.
1.Cable and adapter: Hidden enemies of fast charging
Start with the obvious — but often ignored — even if your cable looks “like new,” it could lose up to 40 percent of its bandwidth due to micro-damage, and the 33-watt adapter that came with the Redmi Note 12 Pro+ eventually starts to lie about its power.
How do you check?
- 🔌 Cable test: Connect it to another device (like an iPad or laptop) If charging is as slow, it's time to change the cable, especially for cheap no-name cords with AliExpress.
- ⚡ Adapter check: Use the Ampere app (available on Google Play). If the current is below 1.5 A (for 18W of adapter) when connecting to the network, the power supply is faulty.
- 🔄 Experiment: Try charging Xiaomi from another brand adapter (such as Samsung or Anker), sometimes other people's power supplies give more current than their native ones.
Important: Even the original Xiaomi cable degrades over time, if you’ve been using it for more than a year, replace it with a certified USB-C → USB-C (for modern models) or USB-A → USB-C (for older ones).
2.The charge saving mode in MIUI: why it brakes the battery
MIUI has a hidden feature that limits charging current — and it's on by default on many models! It's called Battery Optimization, and its goal is to extend battery life. But the side effect is that the smartphone charges 1.5 to 2 times slower.
How to turn it off:
- Go to Settings → Battery and Performance.
- Select Battery Settings → Optimized Charging.
- Turn off the slider or set up a schedule (for example, only at night).
On some models (Xiaomi 12T, Redmi K50), this item is hidden deeper: Settings → Additional → Special features → Battery modes. If you do not find it, use the settings search (the magnifying icon at the top).
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After turning off optimized charging, monitor the battery temperature. If the smartphone is warming above 40 ° C, turn the mode back on - overheating is more harmful to the battery than slow charging.
Battery temperature: invisible brake
Xiaomi automatically reduces the charging current if the battery temperature goes beyond 10–40 ° C. Moreover, “overheating” can be even if the case of the smartphone is cold – the sensor measures the temperature inside the battery.
What to do:
- ☀️ Do not charge in the sun or near the heater.Even if the phone itself is not hot, the battery inside can heat up.
- 🧊 Remove the case (especially silicone or thick armored case.
- 📵 Don’t play games while charging. Genshin Impact or Call of Duty Mobile heats up the processor and with it the battery.
- ❄️ If the smartphone overheats: disconnect it from charging, turn it off for 10 minutes, then plug it back in again.
Check the battery temperature in Settings → Battery → Battery → Battery status or through the CPU Monitor app. If the value is above 45 ° C, the charge will go in emergency mode (current ≤ 0.5 A).
What happens if you ignore the overheating?
4.Background processes and "gluttonous" applications
If Xiaomi is actively using a processor or communication module during charging (for example, downloading updates or syncing photos in Google Photos), the battery recovery rate drops. In extreme cases, the smartphone may even run out despite the connected power!
How to find and eliminate the “culprits”:
- Open Settings → Battery → Battery Use.
- Look at what apps have been consuming power in recent hours. Look at the Android System, Google Play Services, and instant messengers (Telegram, WhatsApp).
- Close unnecessary apps through Recent → Close everything.
- Turn off auto-update apps in Google Play → Settings.
Particularly critical:
- 🎮 Games (even in the background).
- 📷 Camera apps (like Google Camera or FilmoraGo).
- 📥 File managers (torrent downloads, cloud synchronizations).
☑️ Optimization before charging
5 Battery wear: when it's time to change the battery
Lithium-ion batteries degrade over time. After 300-500 charging cycles (≈1.5-2 years of active use), their capacity drops by 20-30%, and the charging speed decreases. If your Xiaomi is older than 2 years and charges slowly even with a new cable, wear and tear is to blame.
How to check the status of the battery:
- Enter the code in the phone app: ##4636##.
- Select Battery Information.
- Look at the Battery Health parameter, and if it's above 80%, the battery needs to be replaced.
The alternative is to use the AccuBattery app, which shows the actual battery capacity and the number of charging cycles, for example, if the Redmi Note 10 Pro originally had a 5020 mAh battery, and now 3800 mAh, that's critical wear.
| Battery wear level | Charging speed | Recommendations |
|---|---|---|
| 0–10% | Normal. | Nothing to do. |
| 10–30% | Decreased by 10-20% | Monitor the temperature, avoid full discharges |
| 30–50% | Reduced by 30-50% | Limit fast charging, replace the battery in the service |
| 50%+ | Critically slow | Urgent replacement! Risk of a sudden blackout |
Important: If you decide to replace the battery, take the original (branded Xiaomi or ATL/LG) or certified (for example, from Baseus). Cheap analogues can not only slowly charge, but also swell in 3-6 months.
6. Software bugs: when firmware is to blame
Sometimes slow charging is not a hardware problem, but a bug in MIUI, especially after major upgrades (e.g., switching from MIUI 13 to MIUI 14).
- The smartphone charges quickly only up to 80%, then “hangs”.
- The charging current jumps (to 2.0 A, then 0.3 A).
- In Settings → The battery appears notification “Charge suspended”.
How to fix it:
- Reset battery settings: Settings → Applications → Application management → Three dots (menu) → Reset battery settings.
- Clear the system cache: Settings → Memory → Clear the cache.
- Update the firmware: Check for updates in Settings → About phone → System update.
- Reverse to the old version of MIUI: If the bug appeared after the update, you can return the previous firmware through Fastboot (instruction on 4PDA).
If nothing helps, try calibrating the battery:
- Discharge your smartphone to 0% (until it turns off).
- Connect to the original charger and charge up to 100% without interruptions.
- Repeat the procedure 2-3 times.
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If your smartphone starts charging slowly after the MIUI update, try resetting the battery settings first, which solves the problem 40 percent of the time without complex manipulations.
7. Failures of the USB-C port or power controller
If all previous steps have failed, the problem may be a physical breakdown:
- 🔌 The polluted port USB-C: Dust, pile, or contact oxidation impair the connection. Clean the port with a wooden toothpick (carefully!) or compressed air.
- 🔧 Damaged Power Controller: If the smartphone doesn't detect charging or charges only in a certain position of the cable, the chip on the board is to blame.
- 💧 Liquid hit: Even if Xiaomi didn't sink, condensation or moisture from rain could have oxidized the contacts. check the moisture indicator (small white dot in the port).
How to check the port:
- Connect your smartphone to your computer, and if it's not detected or the connection is interrupted, the port is broken.
- Try charging your phone vertically and horizontally, and if you're charging faster in one of these positions, you're having a problem with the contacts.
⚠️ Note: Do not use metal objects to clean the port. USB-C! This can make contact with the motherboard and disable it, and use a plastic shoulder blade or a special brush to clean it.
8.Fast charging doesn't work: why Xiaomi is limiting power
Many Xiaomi models support Quick Charge, Turbo Charge or HyperCharge (up to 120 watts in the Xiaomi 11T Pro).
- 🔋 Unoriginal adapter: Even if it supports 30W, a smartphone may not recognize it as a “trusted” adapter».
- 📱 Low charge level: Some models (Redmi) K40, POCO F3) limit current to 80%, then reduce power to protect the battery.
- 🔄 Overheating: At temperatures above 40°Xiaomi C automatically switches to slow charging.
How to get your smartphone to use fast charging:
- Use the original adapter (e.g. Xiaomi 33W/67W/120W).
- Turn on the aircraft mode during charging (reduces the load on the processor).
- Update the firmware – sometimes fast charging bugs are fixed in newer versions of MIUI.
If your Xiaomi supports HyperCharge (120W) but charges slowly, check:
- Is there a dual-pin cable (complete with the Xiaomi 11T Pro) connected? Conventional USB-C cables don't transmit that power.
- Is the function enabled in settings: Settings → Battery → Fast charging?
FAQ: Frequent questions about Xiaomi's slow charging
My Xiaomi charges up to 80 percent and stops. What do I do?
Why is Xiaomi charging slowly from the power bank?
Can Xiaomi Charge Speed Up With Apps?
Why is Xiaomi charging slowly from day one?
How to check if my Xiaomi supports fast charging?
If after all the checks, Xiaomi is still charging slowly, go to the service center, maybe the problem is a power controller or a motherboard damage, but in 90% of cases, the cause is cable, settings or background software, and you can fix it yourself.
⚠️ Warning: Never use “charging accelerators” with AliExpress that promise to be used +50 percent speed, these devices trick the power controller into giving a high voltage, causing the battery to bloat or the port to fail. USB-C.