How to make fast charging on Xiaomi Redmi 9: all the ways from official to hidden

Xiaomi Redmi 9 has become one of the most popular budget devices thanks to its balanced performance, but its owners often face slow battery charging. 10W It charges the battery to 5,000 mAh for almost 3 hours — which is annoying, especially when the phone runs out at the wrong time. In this article, we'll look at all the working ways to speed up charging, from official methods to little-known tricks that actually work.

It's important to understand: Redmi 9 It doesn't support Qualcomm's Quick Charge or Xiaomi Turbo Charge on the hardware level, but it doesn't mean you're doomed to eternal turtle charging. We tested a few methods and selected those that give you speed gains. 30-50% Spoiler: Some solutions require the purchase of additional accessories, but their price will pay off with the time saved.

Before you get to the instructions, check the current charging speed of your Redmi 9.

1. Connect the phone to the charger.
2. Open the Security app → Battery.
3. Click on the graphic icon in the upper right corner.
4. See the value in the section Charging power (usually) 5-10W).

If your value is lower 8W, So charging is in a gentle mode, and that's the first signal that it can be optimized.

Verification of the component charger

Most users do not even suspect that the standard adapter out of the Redmi box 9 — This is the bottleneck of the system. 5V/2A (10W), Although the smartphone’s power controller can withstand 18W (test-data XDA Developers. It's done for the sake of saving, but you can easily get around the restriction.

The first thing you need to do is check the labeling of your charger. The original adapter from Xiaomi should be marked:

• 🔌 Output: 5V ≡ 2A — standard-charging 10W.
• ⚡ Output: 5V ≡ 2A / 9V ≡ 2A — Supports fast charging (if any, you're in luck!).
• ❌ Lack of marking or inscription of the type Made in China without technical data is a sign of forgery.

If your adapter is type one, it needs to be replaced.

Important: When buying a new charger, pay attention to the supported protocols. For Redmi 9, the optimal adapters with Quick Charge 3.0 or Power Delivery are available (PD). Avoid cheap “no-name” charges – they can not only not speed up the process, but also damage the battery.

2. Optimize phone settings to speed up charging

Even with a powerful charger, the Redmi 9 can artificially limit the charging speed due to system settings.

Turn off the power saving mode

Turn off Wi-Fi and mobile data while charging

Close all background applications

Set the brightness of the screen to a minimum

Remove the cover (if the phone overheats)-->

Step 1: Disconnecting the energy saving mode

Go to Settings. → Battery → Power saving mode and disable all options. Super energy saving is especially harmful, it restricts power to power. 5W charger-free.

Step 2: Limiting background processes

Go to Settings. → Annexes → Application management and for the most voracious programs (messaging, social networks, games) choose to limit background activity. This will reduce the load on the processor, which indirectly speeds up charging.

Step 3: Disconnecting wireless modules

Wi-Fi, Bluetooth and mobile internet are all making charging more difficult, as the power controller prioritizes the stable operation of the communication modules, so put your phone in Flight Mode or at least turn off data transmission.

💡

If you need to stay connected while charging, turn on Power Saving Mode for Data in the settings SIM-This will reduce the speed of the Internet, but reduce the charging time on the Internet. 10-15%.

Step 4: Temperature control

Redmi 9 automatically reduces charging speed when heated above 40°C. To avoid this:

• 🌡️ Charge your phone in a cool place (not in the sun or near the battery).
• 📵 Remove the case if it is dense or made of silicone.
• ❄️ Do not use your phone while charging for games or videos.

💡

Optimal temperature for fast charging — 20-35°C. Pri. 45°C and above, the power controller can completely disable the accelerated mode.

3. Use of alternative charging protocols

Redmi 9 doesn’t officially support Quick Charge or Power Delivery, but its power controller (Qualcomm) PMIC) It's capable of running at high voltage, and you have to trick the system into using non-standard power profiles.

Method 1. Charging through USB-hub PD

If you have USB-Hub (for example, to connect the mouse to the phone), try to connect the charger through it. PD, The phone can increase the power consumption to 12-15W.

Method 2. Forced Quick Charge Enablement (requires root)

For advanced users: if you have root access, you can edit the file /sys/class/power_supply/battery/input_current_max, It's dangerous, it's dangerous, it's dangerous, it's dangerous, it can damage the battery.

Method 3: Using Charging from Other Xiaomi Devices

Chargers from Redmi Note 8 Pro, POCO X3 or Mi 9s often run Redmi 9s faster than standard ones, which is because they use the protocol. QC 3.0, which is partially supported by the Redmi 9 controller.

⚠️ Note: When using non-original charging protocols, Redmi 9 may show an incorrect battery percentage (e.g., jumps from 80% to 100%).This is not critical, but you should wait for the full charging-discharge cycle for calibration.

4. Software tricks: hidden settings MIUI

MIUI It has a few hidden features that can affect charging speeds. They're not advertised, but they work.

Method 1. Enabling "Developer Mode" and changing battery settings

1. Activate Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
2. Back to Settings → Additionally. → For developers.
3. Find the Debugging by USB and turn it on.
4. Connect your phone to your PC and execute the command: adb shell dumpsys battery set ac 1 This will force the phone to charge from the network (AC), which sometimes increases the current.

Method 2: Resetting battery data

If the phone doesn't correctly determine the battery capacity, it can limit the charging current.

1. Go to Settings. → Battery.
2. Click on the three dots in the upper right corner and select Battery Data Reset.
3. Connect the charger and wait for the full charge (don’t interrupt the process!).

Method 3: Disabling Optimization MIUI

MIUI It's default to optimize charging to extend battery life:

• 🔧 Go to Settings. → Battery → Settings → Optimizing charging.
• 🔄 Turn off the Adaptive Charging option.
• 📉 In the Charging Modes section, select Fast (if available).

5. Hardware modifications: risks and opportunities

If software methods fail, some users resort to hardware modifications, which require experience and may be insecure, but yield the greatest speed gain.

Modification 1. Replacement of the power controller

Redmi 9 has a Qualcomm controller PM6150, level-limiting 2A. It can be replaced by PM6150L (supportive QC 3.0), but that's it:

• 🔧 Requires rations and specialized equipment.
• 💰 Cost of work + detail: ~3000-5000 ₽.
• ⚠️ Risk of battery overheating if set up incorrectly.

Modification 2: Installation of a larger battery with support for fast charging

On sale there are non-original batteries for Redmi 9 with a capacity of 6000 mAh with support 18W. However:

• ✅ Plus: +20% capacity and accelerated charging.
• ❌ Cons: possible problems with calibration, shortened service life.

⚠️ Note: Any hardware modifications will void the Xiaomi warranty. If you are not sure about your skills, you should contact the service center. Also note that after replacing the controller or battery, the phone may not pass the originality check in the Mi Service.

The myths about Redmi 9 fast charging: what doesn't work

There are a lot of tips on the Internet that not only don't speed up charging, but can also hurt your phone, and we tested the most popular ones and found the most useless ones:

Another common myth is that the thicker the cable, the faster the charging. It's not really the thickness that matters, it's the resistance of the conductor. For Redmi 9, the best cables are:

• 🔌 Type-C - Type-C (not Type-C) connector — USB-A).
• 📏 No more than 1 meter long (the longer the more loss).
• 🔍 Certification USB-IF (The logo should be on the packaging).

7.Alternative solutions: powerbank and wireless charging

If you need to speed up your exercise on a trip or at work, consider alternative power sources.

Powerbank with Quick Charge support

Some external batteries (e.g. Xiaomi Mi Power Bank) 3 Pro or Baseus 65W) support QC 3.0 And they can charge the Redmi. 9 on 15-18W. The main thing is to use the original cable.

Wireless charging: why it's not an option for the Redmi 9

Redmi 9 doesn't support Qi charging at the hardware level. You can buy an adapter, but:

• ⚡ It's not gonna be faster. 5W (wired).
• 🔋 Additional battery heating.
• 💰 Cost of adapter + charging station ~2000 ₽.

Charging from a laptop or PC

If you have a modern laptop with a port USB-C (Thunderbolt 3/4), he can give up 15-20W. For that:

1. Connect the phone to the port USB-C laptop!).
2. Make sure that the laptop is connected to the network (from the battery power is lower).
3. Use a quality Type-C – Type-C cable.

FAQ: Frequent questions about charging Redmi 9