Xiaomi phone slowly charges: what to do with long charging on Redmi, POCO and Mi

Your Xiaomi charges for 4-5 hours instead of the usual 60-90 minutes? the battery barely gains 10% per hour, and the indicator shows “slow charging”? The problem is familiar to many owners of Redmi Note 12, POCO X5 or even flagship Xiaomi 13. In 80% of cases, it is not the fault of the breakdown, but the banal errors of users or software failures. But how to distinguish the “treatable” case from a critical battery failure?

This article will look at all the causes of slow charging (from a contaminated port to hidden MIUI settings), step-by-step diagnostic and repair instructions, and a charger compatibility table for popular Xiaomi models. We won’t advise “just buy a new cable” – instead, you’ll learn how to check the actual charging speed through the engineering menu and why even the original adapter can slow down the process.

Spoiler: 30% of the time, MIUI optimization is to blame, which can be turned off in 2 clicks. And if the phone warms while charging, it's not always bad (but sometimes signals battery death).

1. Check charger and cable: 5 tests before repair

The first thing to rule out is that the charger malfunctions, and even if you use Xiaomi's native adapter, it could have failed. Here's how to check if it works:

• 🔌 Test on another device: Connect the charge to another smartphone (preferably the same model). If it charges normally, the problem is in your phone, if slow, the adapter is to blame.
• 📱 Cable Check: Try charging your phone through another cable (preferably original) USB-C certified USB-IF). Cheap cables often have thin veins that can’t withstand currents above 1A.
• 🔋 Measurement of output current: Install the Ampere app (available on Google Play) and check what current is coming to the battery. The rate for fast charging is 1800-3000 mA, for standard charging it is 1000-1500 mA.
• 🔥 Heating of the adapter: If the charger is warmer than usual, it is a sign of a malfunction.Switch it off and do not use it - there is a risk of fire.
• 🔄 Power Delivery Test: Connect your phone to charge from a laptop or powerful power bank with support PD (For example, Xiaomi 20000 mAh PD). If the speed is higher, your adapter doesn’t support the required protocols.

Pay special attention to the USB-C port on your phone. Often dust accumulates inside, which prevents close contact, carefully clean it with a toothpick (not a metal object!) or compressed air. If the contacts are bent, this is already an excuse to contact the service.

⚠️ Warning: Never use chargers with an output current above 5V/3A (15W), If your Xiaomi doesn't support fast charging, it could cause the battery to bloat or the power controller's protection to go off.

2.Program reasons: why MIUI slows charging

MIUI has built-in charging optimization mechanisms that can artificially limit speed, which is designed to extend battery life, but often works too aggressively.

2.1. disabling “Smart Charging” (Smart Charging)

The Smart Charging feature in MIUI 12-14 limits the charge to 80-90% if the phone is connected overnight.

1. Go to Settings → Battery and Performance → Battery Settings
2. Find Smart Charging (or Optimized Charging on the newer versions).
3. Turn off the slider and restart the phone.

Resetting battery settings

Sometimes the battery calibration data gets lost, and the system miscalculates the charging current.

1. Press the power button and select Reboot to Recovery mode.
2. From the recovery menu, select Wipe & Reset → Wipe Battery Stats.
3. Confirm the action and restart the phone.

If you haven't increased your speed after this manipulation, check the background. Some applications (like Facebook, TikTok or games) actively consume energy during charging, which is why some of the current goes to the processor instead of the battery.

Check the enabled Smart Charging | Update MIUI to the latest version |Reset battery statistics |Close background apps (especially games) | Turn off Bluetooth/Wi-Fi while charging-->

3. Hardware malfunctions: when without service can not do

If the software methods didn't work, the problem could be physical damage to the components, and here are some signs you should contact the service center:

• 🔥 The phone is very warm (over 45).°C) even when charging normally, a sign of a failure of the power controller or battery.
• ⚡ Charging is interrupted (it goes, then stops) - a problem with port contacts or plume may be possible.
• 📉 The battery is swelling (the body of the phone is deformed) - it's dangerous to operate such a device.
• 🔌 Port port USB-C staggers or contacts are bent - you need to replace the connector.
• 🔋 Battery capacity dropped below 70% (checked in Settings) → Battery → Condition) - battery is worn out.

The most common hardware problem is battery wear. The average life of lithium polymer batteries is 300 to 500 cycles (2 to 3 years of active use), after which the capacity drops and the charging speed decreases, and you can check the battery status through the AccuBattery application (reveals real capacity and wear in %).

⚠️ Warning: If your Xiaomi suddenly stopped charging at all (even after resetting), don’t try to “resuscitate” it by connecting it to a more powerful adapter.This can damage the motherboard and make repairs 2-3 times more expensive.

4. Charger compatibility: which charging suits your model

Many users mistakenly believe that any USB-C charger is suitable for Xiaomi, in fact, charging speed depends on support for protocols (Quick Charge, Power Delivery, HyperCharge, etc.). For example, the Redmi Note 11 supports Fast Charging 33W, but only with the original adapter. Third-party charging can give only 10W.

The table below shows the minimum charger requirements for popular Xiaomi models (the data is relevant for 2026):

If you use wireless charging, note that it is always slower than wired charging (even at the same power).For example, the Xiaomi 13 Pro supports 50W over the air, but the real speed rarely exceeds 20-25W due to power losses.

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To check the actual charging power, install the Battery Guru app (showing voltage, current and temperature in real time). If the current is below 1000 mA when connected to the grid, something is clearly wrong.

5. How to speed up charging: 7 working ways

If the diagnosis does not reveal critical problems, try these methods to speed up charging:

• ❄️ Refrigerate your phone: At temperatures above 35°C power controller automatically reduces current. Remove the case and put the phone in a cool place (but not in the refrigerator!).
• 🛩️ Turn on Flight Mode: Shutting down the network, Wi-Fi and Bluetooth reduces the load on the processor, and more power goes to the battery.
• 🔕 Turn off the phone: When switched off, Xiaomi charges 20–30% faster (but don’t do it regularly – it shortens battery life).
• 🔄 Use the original cable: Cheap cables often don't support high currents. USB-C From Xiaomi, it can stand up to 5A.
• 📵 Turn off background processes: Close all applications through Settings → Annexes → Launched.
• 🔋 Charge from the socket, not from USB-PC ports: Ports USB 2.0 is a maximum. 0.5A, USB 3.0 to 0.9A.
• 🔄 Update. MIUI: In new versions of firmware often fix power management bugs.

If none of these methods worked, try resetting your phone to factory settings (be sure to back up!).In 10% of cases, slow charging is associated with deep software glitches that don't get fixed otherwise.

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The most effective way to speed up charging is to combine the original adapter + cable + phone switched off, but it is not recommended to do this regularly, because it reduces battery life.

6.When to change the battery: signs of critical wear

If your Xiaomi is over 2 years old, chances are it’s a worn-out battery that’s the problem.

• 📉 Capacity dropped below 80% (checked in AccuBattery or Settings) → Battery → Status).
• 🔥 The phone will run out in 2-3 hours without active use.
• ⚡ The charge is jerky (fast, then slow).
• 🔋 The battery swelled (seen by the raised screen or the warping of the body).
• 🛑 Phone turns off at 20-30% charge (calibration failure).

The cost of replacing the battery in the service center Xiaomi:

• Redmi Note 10/11: ~1500–2000 ₽ (original).
• Xiaomi 12/13: ~2500–3500 ₽.
• POCO X3/X4: ~1200–1800 ₽.

If you choose to change the battery yourself, buy only original batteries (branded Xiaomi and hologram). Cheap counterparts often have lower capacity and can swell in a few months.

7. frequent user errors that spoil the battery

Many of the habits that seem harmless actually shorten battery life and slow down charging.

• 🔌 Charge your phone in the cold (below 0)°C) or in heat (above 40)°C) Optimal temperature: 10-30°C.
• 📵 Use cheap power banks without overload protection. They can deliver unstable voltages.
• 🔋 Keep your phone on charge for days, and after 100 percent, the battery starts to degrade faster.
• ⚡ Use charges from other devices (such as iPhone or Samsung) without checking compatibility.
• 🔄 Lithium polymer batteries don't like deep discharge.
• 🛠️ Disassemble your phone to clean the port without experience, risk damaging the battery plume.

Also avoid fast charging on cheap adapters. For example, if your Redmi supports 33W but you plug it into a no-name 60W charge, the power controller may burn. Always check compatibility!

FAQ: Answers to Frequent Questions