Reverse charging in Xiaomi smartphones: how it works and why you need it

Have you ever wondered why your Xiaomi smartphone can not only charge from the outlet, but also become a power source for other gadgets? This feature is called reverse charging, a technology that turns your phone into a power bank. But how does it work in practice, which Xiaomi models support it, and are there pitfalls? In this article, we will examine everything from technical nuances to step-by-step activation instructions.

Reversible charging (or reverse charging) is not just a marketing trick. For owners of the Xiaomi ecosystem, it opens up new possibilities: recharge Redmi Buds headphones on the road, save a discharged Mi Band fitness bracelet or even help a friend with a dead phone. But before you actively use the feature, you need to understand its limitations — the power transfer rate here is far from the same as a full-fledged bank power, and constant use can affect battery wear.

What is reverse charging and how it works in Xiaomi smartphones

Reversible charging is a technology that allows a smartphone to give a charge through USB-So unlike traditional charging, where current goes to the battery, it's the opposite of the same thing, where the phone's power controller redirects energy from the battery to the connected device.

In Xiaomi smartphones, this feature is implemented via the USB OTG (On-The-Go) protocol with Power Delivery or Quick Charge support. It is important to understand that reverse charging is not the same as wireless reverse charging (which is supported by, for example, iPhone or Samsung Galaxy).

• 🔌 USB OTG — A standard that allows a smartphone to act as a host (e.g., plug in flash drives or mice) and reverse charging uses this protocol to transmit power.
• ⚡ Power: usually limited to 5-10 watts (depending on the model) that's enough for a headphone or bracelet, but not a laptop.
• 📉 Battery discharge – when activated, your smartphone will lose charge faster than in normal mode.

Technically, the process looks like this: when you connect another device to a smartphone through OTG-The cable, the power controller, identifies him as an energy user, and starts to supply current, and the phone can get a little warmer, which is normal, but you shouldn't overuse the function in the heat.

What Xiaomi models support reverse charging

Not all Xiaomi smartphones are equipped with this feature, which has appeared relatively recently and is available mainly in flagship and some mid-budget models. Below is a table with current devices (for 2026) that support reverse charging:

If your model isn't listed, it doesn't mean the feature is definitely missing. Some devices (like the Xiaomi 11T Pro) support reverse charging, but only through hidden settings or after a firmware update.

1. Connect to the smartphone another device through OTG-cable.
2. If the “Reverse Charging Activated” notification appears on the screen, the function works.
3. If nothing happens, check the settings in the Battery → OTG Mode section.

⚠️ Note: Some Chinese versions of Xiaomi smartphones may have reverse charging disabled by default, in which case you will need to unlock the bootloader and install global firmware.

Advantages and Disadvantages of Reverse Charging

Like any technology, reverse charging has its pros and cons, so let's go through them in detail so you can make an informed decision about using it.

Pluses

• 🆘 Emergency help – you can recharge your headphones, bracelet or other phone in a critical situation.
• 🎒 Compact – you don’t need to carry a separate power bank if you have a flagship Xiaomi.
• 🔄 Universality – Works with the majority USB-devices (except those that require high power).
• 💡 Integration with the ecosystem – perfect for Xiaomi gadgets (like Mi Band 8 or Redmi Watch 3).

Cons

• ⚡ Low speed: 5-10 watts is enough only for small devices. Charging another smartphone will not be completely possible.
• 🔋 Battery discharge – your phone will lose charge 1.5-2 times faster than normal.
• 🔥 Heat – with prolonged use, the smartphone can overheat, especially in hot weather.
• 🛠️ Battery wear – frequent reverse charging can shorten battery life.

The critical thing is that reverse charging is not designed to be used all the time, it's designed for emergencies where there's no power bank or outlet at hand, and if you need to charge other devices regularly, you better get an external battery.

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Before using reverse charging, close all background apps on your smartphone – this will reduce battery load and reduce heating.

How to turn on reverse charging on Xiaomi: step-by-step instructions

Activation of the function depends on the smartphone model and the version of the MIUI firmware. In most cases, the process looks like this:

Connect. OTG-smartphone-mount|Make sure the battery is above 20%|Connect the second device to the cable|Watch the temperature of the phone-->

1. Connect. OTG-Use a high-quality cable with support USB-C (For new models, or Micro-USB (older ones), cheap cables may not work.
2. Connect the second device. This can be headphones, a fitness bracelet or another smartphone (if it supports USB charging).
3. Wait for the notification. The message will appear on the screen: "Reverse Charging is on." If it is not, check the settings.
4. Monitor the charge. The notification panel will display the current battery level and discharge rate.

If the function is not activated automatically, try to enable it manually:

1. Go to Settings → Battery and Performance → OTG Mode.
2. Activate the “Reverse Charging” switch (or “OTG Charging”).
3. Confirm the action if a warning about the battery discharge appears.

⚠️ Note: Some models (e.g. Xiaomi) 12T) Reverse charging is only enabled when a device with a low charge level (less than 15%) is connected. If the battery of the second gadget is charged more than 20%, the function may not work.

If you have a POCO or a Redmi with custom firmware, the path to settings may be different.

Settings → Additional → Special features → OTG mode

Safety and recommendations for use

Reversible charging is a convenient feature, but its improper use can harm the battery or even make the smartphone out of order.

• 🔋 Minimum battery power.Do not activate the feature if the phone's charge is below 20%.This can cause a sudden shutdown.
• 🌡️ Temperature control: If the smartphone is heated above 40°C, immediately turn off reverse charging. Overheating is dangerous for lithium-ion batteries.
• ⚡ Cable quality. Use only certified cables. OTG-Cheap analogues can short circuit.
• ⏱️ Time limit. Don't keep the function on for more than 30 to 40 minutes straight. Let's rest the battery».

Special attention should be paid to the state of the battery. Regular reversing charging increases the number of discharge cycles, which over time reduces the battery capacity. If you notice that the phone has become more quickly discharged, check the battery status in the Settings menu → Battery → Battery status.

If you use reverse charging frequently, consider buying an external Xiaomi Power Bank battery.It’s not only safer for your smartphone battery, but it’s also more powerful (up to 30 watts).

Comparison of Xiaomi reverse charging with analogues from other brands

Xiaomi isn’t the only manufacturer to have implemented reverse charging in their smartphones.Let’s compare this feature to solutions from Samsung, Huawei and Apple to see how competitive it is.

As you can see from the table, Xiaomi offers one of the most versatile options — wired reverse charging works with most devices, and 10W of power allows you to recharge small electronics relatively quickly.However, compared to Huawei, Xiaomi does not have a wireless option, which can be a disadvantage for users who prefer convenience.

Xiaomi’s main advantage is compatibility with its own ecosystem.If you have a Mi Watch smartwatch, Redmi Buds headphones or Mi Band fitness bracelet, reverse charging is a great solution for emergencies.

💡

Reverse charging in Xiaomi wins over competitors in versatility (works with any USB-devices), but loses in speed and lack of wireless option.

Frequent problems and their solutions

Even if your smartphone supports reverse charging, you may find it difficult to use it, and let’s look at the most common problems and ways to fix them.

1. The function is not activated

After the connection OTG-cable doesn't happen:

• Check that the cable is serviceable and supports data transfer (not all charging cables are suitable for OTG).
• Make sure your smartphone battery is above 20%.
• Update the MIUI firmware to the latest version – in older versions, the feature may have been disabled.
• Restart your phone and try again.

2.The device is connected but not charged

If the second device is detected but no charge is received:

• Try another cable or port.
• Check if the connected device supports USB charging (some gadgets require special adapters).
• Turn off all background apps on your smartphone – they may limit the current supply.

3.The smartphone is warming up a lot

Overheating is one of the most dangerous problems.

• Do not use reverse charging at ambient temperatures above 30°C.
• Remove the case from your smartphone for better heat sink.
• Limit the time of use of the function to 20-30 minutes.

4.The smartphone battery is rapidly draining

This is normal, but if the discharge goes too fast:

• Close all applications that consume energy (games, navigators, social networks).
• Activate the energy saving mode in the settings.
• Use reverse charging only when connected to the network (if the phone is charging itself, it will give off energy without losing its own charge).

⚠️ Note: If after using reverse charging, the smartphone stopped turning on or the battery discharged in a few minutes, this may indicate battery damage.

FAQ: Answers to popular questions