How to set up fast charging on Xiaomi Mi A3: from checking support to solving problems

Xiaomi Mi A3

Quick Charge 3.0

In this article, we’ll look at how to check for fast charging support on your Mi A3, which chargers and cables are right, and how to optimize Android settings for maximum speed, and how to “slow down” charging and fix it without going to a service center.

It’s worth noting that the Mi A3 is part of the Android One lineup, which puts some restrictions on running firmware, such as the MIUI Menu that doesn’t have the “Accelerated Charging” option on other Xiaomi models, but that doesn’t mean fast charging isn’t available, it just needs to be “waked up” correctly.

1. Check support for fast charging on Xiaomi Mi A3

Before you set up a fast charge, make sure your smartphone really supports it. Xiaomi Mi A3 is equipped with a Qualcomm Quick Charge 3.0 controller, but there are nuances:

First, the technology only works when using an original or certified QC 3.0/2.0 charger. The standard power supply kit (5V/2A) does not provide maximum speed. Second, the cable must support 3A and higher current transmission – thin or damaged wires will “suffocate” power.

To check the current charging speed:

1. Connect your smartphone to the charger.
2. Open the Battery application in the settings (Settings → Battery).
3. Look at the charging schedule – if the power is above 10W, then fast charging is active.

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If you don't have a power chart on the Battery menu, install the AccuBattery app from Google Play, which will show you the exact current and voltage values in real time.

You can also use the engineering menu:

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In the Battery Information section, see AC Power and USB Power settings. When charging fast, values should be higher than 5V/2A.

2.What chargers and cables are suitable for the Mi A3

This is a key point: even if your smartphone supports Quick Charge 3.0, an inappropriate charger will make all the effort go wrong.

Chargers:

• 🔌 The original unit from Xiaomi labeled MDY-10-EU (18W) is the best option.
• ⚡ Certified QC 3.0 from other brands: Anker PowerPort III, Belkin Boost Up, Aukey PA-Y18.
• ❌ Cheap "no-name" units - often do not match the declared characteristics and can damage the battery.

Cables:

• 🔗 Original USB-C cable from the Mi A3 kit (supports current up to 3A).
• 🔌 Certified USB-C → USB-C cables marked USB-IF (e.g., from Anker or UGREEN).
• ⚠️ Avoid cables with thin wires - they overheat and limit current.

Important: If you use wireless charging, the maximum power on the Mi A3 is less than 10W (Qi standard), which is 1.5-2 times slower than wired fast charging.

3. Setup the software for maximum speed

Even with the right charger, the Mi A3 can charge slowly due to Android settings.

Turn off battery optimization for system applications:

1. Go to Settings → Applications and Notifications → Special Access → Battery Optimization.
2. Click on the three dots in the top right corner and select All Apps.
3. Find Google Play Services and Android System Interface, select Not Optimize.

Activate the developer mode and turn on fast charging:

1. Go to Settings → About phone and 7 times click on the Assembly Number.
2. Back to Settings → System system → For developers.
3. Find the option Do not turn off the screen while charging (accelerates the process by 10-15%).
4. Turn on USB debugging – this will unlock additional power transfer protocols.

Update the firmware:

Some versions of Android on the Mi A3 had power management bugs. Check for updates in Settings → System → System Update. Topical firmware (like Android 11 for the Mi A3) fixes charging issues.

Use original or certified QC 3.0 block | USB-C cable with 3A| Battery optimization for system applications disabled | Developer mode enabled |Firmware updated to the latest version-->

4 Why Xiaomi Mi A3 can charge slowly: Common reasons

If you’ve set everything up correctly, but your smartphone is still charging slowly, check out these points:

Overheating of the battery or processor:

At temperatures above 40°C, the charging controller automatically reduces the current, which can be due to:

• 🔥 Games or heavy applications while charging.
• 🌞 Direct sunlight or hot weather.
• 🔋 Worn-out battery (check battery health at AccuBattery).

Background processes:

Some apps (e.g. Facebook, Instagram, instant messengers) consume energy even in the background, shut them down before charging or turn on Airplane Mode.

Damaged USB-C connector:

If the contacts are contaminated or deformed, the smartphone will not be able to get full power.

Faulty battery:

After 300 to 500 cycles of charging, the battery capacity decreases by 20 to 30 percent, which affects speed. Check the wear and tear in AccuBattery. If it's below 80 percent, replace the battery.

Charging speed comparison: original vs non-original charger

To illustrate the difference, we tested the Xiaomi Mi A3 with different chargers.

As you can see from the tests, the difference between the original and certified charger is minimal (only 5-10 minutes).

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Using the original or certified QC 3.0 charger reduces the charging time of Xiaomi Mi A3 by almost 2 times compared to the standard 5V/2A unit.

6.How to extend battery life when using fast charging

Fast charging is convenient, but can shorten battery life if you do not follow simple rules:

Advice on careful use:

• 🔋 Do not keep your smartphone on charge after reaching 100% – turn it off or use a charge limit (e.g. up to 80% via AccuBattery).
• ☀️ Avoid charging at extreme temperatures (below 0°C or above 40°C).
• 🔌 Use original or certified accessories – cheap analogues can damage the power controller.
• 📵 Periodically (every 1-2 months) perform a full discharge/charging cycle to calibrate the battery.

Myths about fast charging, which you should not believe:

• ❌ "Quick Charge spoils the battery in 1 year" - modern lithium-polymer batteries are designed for 500-800 cycles regardless of the charging speed.
• ❌ “You always have to charge up to 100%” – on the contrary, a constant charge to the maximum reduces the battery life.
• ❌ Night charging is harmful – only harmful if the smartphone overheats or uses a non-original unit.

For maximum battery life, stick to the 20-80 rule: try to keep your charge in the range of 20-80% and avoid deep discharges.

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In AccuBattery settings, you can turn on a notification when you reach 80% charge, which will help to avoid unnecessary battery load.

7. Problem Solving: What to Do If Fast Charging Doesn't Work

If you’ve followed all the guidelines, but the Mi A3 is still charging slowly, try these steps:

Resetting charging settings:

1. Go to Settings → System → Resetting settings.
2. Select Reset App Settings (this won’t delete your data).
3. After restarting, check the charging speed.

Checking of the power controller:

If the smartphone does not recognize fast charging even with the original unit, there may be a malfunction of the controller.

• 🔌 Charging is only in the off state.
• ⚡ The power does not exceed 5W regardless of the unit.
• 🔥 The smartphone is very warm in the area of the connector.

In this case, a diagnosis is required at the service center.

Flip-over:

If the problem occurs after the Android update, try rolling back on the previous firmware version or installing custom software (like LineageOS), however, this requires unlocking the bootloader and may take away the warranty.

⚠️ Warning: If the charger starts to reboot cyclically after you plug it in, turn it off immediately! This is a sign of a short circuit in the power supply. Do not use this charger again.

FAQ: Frequent questions about fast charging Xiaomi Mi A3