You connected Xiaomi to charging, but the percentage of the battery crawls like a turtle, and the indicator shows “3 hours left to fully charge”? Slow charging is one of the most common problems for smartphone owners of this brand, and it can occur on both new models (Redmi Note 13 Pro+, Xiaomi 14 Ultra) and devices 2-3 years ago. In some cases, the user is to blame (for example, using a non-original cable), and sometimes the problem lies in hardware malfunctions that require the intervention of the service center.
In this article, we’ll look at all the possible causes of slow charging, from simple connector contamination to battery wear, and give you step-by-step instructions on how to diagnose and fix the problem yourself. You’ll learn what MIUI settings affect charging speed, how to check the charger’s health and when it’s time to carry your phone for repair. If your Xiaomi has started charging 2-3 times longer than usual, start with the first section — most likely, the solution lies on the surface.
1. Unoriginal or damaged cable/power supply
The first thing to check is the charger and cable, and even if they look good, internal damage (such as broken veins inside a cable or burnt-out elements in a power supply) can reduce charging power by several times, especially when using cheap Chinese products instead of the original Xiaomi accessories.
How to check:
- 🔌 Try charging your phone with another cable and power supply (preferably original). If the charging speed has increased, accessories are a problem.
- 🔍 Check the cable for insulation damage, bending or melted areas, most often breaking the spaces at the connectors (USB-Type-C or Micro-USB).
- 📊 Use the AccuBattery app (available on Google Play) to measure the actual charging power. If it is lower than the stated power (for example, 10 W instead of 33 W), the power supply is to blame.
Note that even Xiaomi’s original cables wear out over time, the average lifespan of a quality cable is 6-12 months with heavy use, and if your cable is over a year old, replacing it can solve the problem.
⚠️ Note: Using uncertified chargers with power above 30W (such as 67W or 120W) can cause the battery to overheat and wear it faster.Always check the power supply's compatibility with your Xiaomi model.
2.Contamination of the charging connector or oxidation of contacts
The USB-Type-C connector (or Micro-USB in older models) is one of the most vulnerable parts of a smartphone: Dust, pile from your pockets, sweat, or even small debris can disrupt the contact between the cable and the phone, leading to intermittent charging or a complete stop. In some cases, the phone may indicate that charging is underway, but the battery percentage does not increase.
How to clean the connector:
- 🧹 Use a toothpick or plastic spatula (not metal!) to gently remove debris from the connector. Move along the contacts without pressing too hard.
- 💨 Blow the connector with compressed air (such as a canister for cleaning equipment). Do not use a hair dryer - it can damage the chips.
- 🔥 If the contacts are oxidized (a green or white coating appears), wipe them with a cotton swab dipped in alcohol (at least 70%).
If you still have a problem after cleaning, try wiggling the cable slightly in the connector while charging, and if the battery percentage starts to rise, the contact is still broken and the connector needs professional cleaning or replacement.
What happens if you don't clean the connector?
Battery wear: how to check and what to do
The lithium-ion and lithium-polymer batteries used in Xiaomi smartphones have a limited lifespan — typically 300 to 500 full charge cycles. After that, battery capacity starts to decline and charging time increases. If your phone is older than 2 years, chances are that the battery is already worn out.
How to check the status of the battery:
- Open the Settings → Battery → Battery status (some models may have different paths) If the capacity has dropped below 80% of the original capacity, the battery needs to be replaced.
- Install the AIDA64 or AccuBattery app and check the Battery Health setting. A value below 80% is critical.
- Pay attention to battery life. If the phone used to hold a charge for a day, and now it discharges in 4-5 hours, this is a clear sign of wear and tear.
If the battery is worn out, it can be replaced at a service center. The cost of replacing in official Xiaomi centers varies from 1,500 to 4000 rubles depending on the model. Self-replacement is possible, but requires experience - if installed improperly, you can damage the plumes or power controller.
| Battery capacity | Status. | Recommendations |
|---|---|---|
| 90–100% | Excellent. | There are no problems with charging, watch the temperature regime. |
| 80–89% | Satisfactory | Charging time can increase by 10-20%, calibration is recommended. |
| 70–79% | Critical | Charging takes 1.5 to 2 times longer. Get ready to replace. |
| Less than 70% | Emergency. | The battery needs an urgent replacement, the risk of a sudden shutdown of the phone. |
4.The effect of MIUI settings on charging speed
The MIUI's proprietary shell has several features that can artificially limit charging speeds to extend battery life, such as Optimized Charging mode slows the process after 80%, and background processes can consume energy faster than it comes in.
What settings to check:
- 🔋 Optimized charging: go to Settings → Battery → Battery settings and disable this option if it is active.
- 📵 Background activity of applications: some programs (such as instant messengers or games) can consume a charge even while charging. → Annexes → Permits → Auto-start.
- 🌡️ Overheating: If the phone is heated above 40°C, MIUI automatically reduces charging power. Close all applications and let the device cool down.
Also worth paying attention to is the performance mode. Some models (POCO F5, Redmi K60) have a high performance option that speeds up charging but increases heating.
Settings → Special features → MIUI Laboratory → Performance mode💡
If you are using Xiaomi with wireless charging support (such as the Xiaomi 13 Pro or Mix Fold 3), make sure the charging station is located strictly in the center of the rear panel.A shift of even 5 mm can reduce the charging power by 2 times.
5. Software failures and firmware errors
Sometimes slow charging is not due to hardware, but to software errors — for example, after updating MIUI or installing custom firmware, in which cases, resetting or flashing helps.
How to diagnose a software failure:
- 🔄 Restart your phone in Safe Mode (click the power button) → long tap on "Switch off» → «Safe Mode. If it's charging normally, it's one of the apps installed that's to blame.
- 📱 Check the temperature of the processor using CPU Monitor, if it's over 60°C without load - possible failure in power management.
- 🔧 Make a factory reset (remember to save data!). → The phone. → Resetting settings.
If the reset didn’t work, try flashing your phone through Fastboot or Recovery. Official firmware for Xiaomi can be downloaded from MIUI Downloads. You’ll need an unlocked bootloader to run the firmware (instructions are available on the 4PDA forum).
⚠️ Warning: After flashing through Fastboot, the phone may lose data IMEI, Always back up before you run your firmware and only use official images.
6. Hardware malfunctions: when repairs are needed
If all previous methods failed, the problem is probably hardware, and here are the most common malfunctions that lead to slow charging:
- 🔌 The power controller, the chip that regulates battery charging and discharging, is damaged, and when it fails, the phone can only charge 5 to 10 percent per hour.
- 🔋 Battery bloating – if the battery is swelling, it can push other components, disrupting the contacts, in which case the charging can be interrupted or go jerky.
- 📱 Motherboard problems, such as burnt tracks or capacitors, often after a phone falls or moisture hits.
How to diagnose a hardware malfunction:
- See if the phone is heating up in the charging socket area, and if so, a short contact is possible.
- Check if the back cover is moving away - this is a sign of a bloating battery.
- Connect the phone to your PC and see if it's defined as a chargeable device, and if it's not, the problem is the controller.
Cost of repair in the service center:
- Replacement of the power controller - 2 000-5 000 rubles.
- Replacement of the battery - 1,500-4000 rubles.
- Mainboard repair – from 3 000 rubles (depending on the complexity).
💡
If the phone stopped charging after a fall, water hit or disassembly on its own, do not try to fix it yourself. Incorrect actions can short circuit and completely fail the device.
External factors: temperature, humidity, power source
Xiaomi’s charging speed depends not only on the phone itself, but also on external conditions, such as low temperatures (below +5°C) when lithium-ion batteries charge extremely slowly, and high temperatures (above +40°C) when the forcedly system reduces power to avoid damage.
What external factors affect charging:
- ❄️ Cold: If the phone was in the cold, before charging, let it heat up to room temperature (15-20 minutes).
- ☀️ Heat: Do not charge your phone in direct sunlight or near heat sources (such as on the dashboard of a car).
- 🔌 Unstable power: if you charge your phone from USB-PC port, power will be limited to 0.5-1 A. Use the socket.
- 💧 Humidity: If water is in the connector, it can oxidize, which requires drying (at least 24 hours) or replacing the connector.
Critical information: If your Xiaomi supports fast charging (for example, 67W or 120W) but only charges 5-10W, check the power supply for Quick Charge 3.0/4.0 or PD (Power Delivery) standards. Cheap blocks often do not support these protocols, even if high numbers are indicated on the case.