How to connect wireless charging to Xiaomi Redmi 9 with NFC: guide

Xiaomi Redmi 9 with module NFC — It's a popular budget smartphone, but it's a problem that people often have: it doesn't support wireless charging out of the box, but that doesn't mean that you can't recharge your battery without wires. In this article, we’ll break down all the ways you can connect Qi-compatible charging to your Redmi 9, including adapter selection, customization, and the ability to use the same. NFC and solving typical problems.

It is important to understand that the Redmi 9 (model) M2003J15SC s NFC) It doesn't have a wireless charging coil built in, but you can get around that limitation with external accessories. We've analyzed all the solutions available, from universal receivers to specialized cases, and we've put together proven instructions that are tailored to the specific features of the firmware. MIUI and the MediaTek Helio hardware platform G80.

1.Why Redmi 9s NFC Does not support wireless charging out of the box"?

The main reason for the lack of wireless charging in the Redmi 9 is the savings on hardware stuffing. Unlike flagship models (for example, Xiaomi Mi 11 or Redmi). K50), budget smartphones lack the built-in Qi coil that's responsible for receiving power from the charger. NFC (version M2003J15SC) This technology does not affect this function – these technologies work at different frequencies and are not connected to each other.

Key hardware limitations:

• 🔋 No Qi receiver – there is no room in the housing for the inductor required for wireless power transmission.
• 📏 Thickness of the case – even when adding an external adapter, it may be necessary to remove the back cover or use a thickened case.
• ⚡ Power Limits – Maximum charging speed through USB-C form 18W, Wireless adapters are rarely exceeded 10W.

However, there is a solution: external Qi receivers that connect to the connector. USB-C They're attached to the back of the smartphone, and they convert the AC from the charging station to a constant current that's compatible with the Redmi 9 battery, which has a capacity of 5,020 mAh).

2. Compatible adapters for wireless charging: which one to choose?

There are three types of adapters available for Redmi 9:

For Redmi 9s NFC We recommend two options:

1. Nillkin Magic Tag Adapter – a thin receiver with a connector USB-C, power up to 10W. Suitable for covers up to 3 mm thick.

⚠️ Note: When buying an adapter, check that it supports Qi protocol (standard for most wireless charging).Some cheap models only work with specific stations and can damage the battery.

Check compatibility with USB-C (not micro-USB!)|Make sure that the charging power does not exceed 10W|Pay attention to the thickness of the adapter (should fit under the cover)|Check out the reviews about heating during charging-->

3. Step-by-step instruction: how to connect wireless charging

The connection process depends on the type of adapter, and let's consider the most versatile option, the external Qi receiver.

Step 1: Preparing your smartphone

Before installing the adapter:

• 🔌 Disconnect Redmi 9 from the charger.

Step 2: Connecting the Qi receiver

And you'll usually have a double-sided tape or magnetic substrate with the adapter.

1. Attach the adapter to the center of the back panel (avoid the camera area and NFC-antennae).
2. Connect the plug. USB-C You don't have to do anything, you have to do it.
3. Secure the adapter with tape or magnetic plate (if included).

Step 3: First connection to the charging station

Place your smartphone on a Qi-compatible charging station (e.g. Xiaomi Mi Wireless Charging Pad or Samsung). EP-PG920). Make sure that:

• 🔄 The indicator at the station caught fire (usually blue or green).
• ⚡ On the screen Redmi 9 appeared the charging icon (can be displayed with a delay of up to 10 seconds).

⚠️ Warning: If charging does not start, check: Adapter position - it should be strictly in the center of the rear panel. Station power cable - some models require the use of the original power supply. Case - if it is too thick (more than 3 mm), remove it.

4. Impact. NFC Wireless charging: myths and reality

Many users fear that the installation of a Qi receiver will disrupt the operation of the module. NFC We'll see if that's true in Redmi 9.

NFC (Near Field Communication and Qi Charging work on different principles:

• 📶 NFC Uses a frequency of 13.56 MHz to transmit data at a distance of up to 10 cm.
• ⚡ Qi operates at 100-205 kHz and is designed for power transmission only.

In most cases, the adapters do not block the NFC, if:

• 🔍 They do not overlap the antenna area (usually located at the top of the back, next to the camera).
• 📏 Their thickness does not exceed 1.5 mm (thicker can weaken the signal).

To check the efficiency of the NFC post-adapter:

1. Open the Google Pay or Mi Pay app.
2. Bring your smartphone to the payment terminal (for example, in a store).
3. If the payment passes — NFC works normally.

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If NFC stopped working after the adapter was installed, try to move the receiver 1-2 mm away from the top edge of the smartphone.

5. Common Mistakes and How to Avoid Them

When connecting wireless charging to Redmi 9, users often face typical problems, and we've collected the most common and ways to solve them.

Critical: Never use adapters with higher power 10W Redmi 9: This can cause the power controller to overheat and reduce battery life.

Another common mistake is using unoriginal cables to connect the station to the outlet. Cheap cables may not provide enough current, which will interrupt charging. USB-C marked 5A.

6. Alternative wireless charging methods for Redmi 9

If external adapters don’t suit you, consider alternative options:

Magnetic fastening charging stations

Some manufacturers (such as Anker or Belkin) produce magnetically mounted stations that lock the smartphone in the optimal position. 10W. The main plus - you do not need to precisely position the device on the site.

2. Battery and Qi-charging cases

There are battery cases (such as the Mophie Juice Pack) that not only protect the smartphone, but also support wireless charging, which are more expensive than conventional adapters, but provide additional battery capacity (up to 3000 mAh).

3. Homemade solutions (for experienced users)

If you're willing to take the risk, you can build a Qi coil inside the Redmi 9 case.

• 🛠️ Disassemble the smartphone (risk of damage to plumes!).
• 🔧 Solder the coil to battery contacts or power board.
• 🔌 Connect the coil to the charging controller.

⚠️ Warning: Self-modification of the Redmi 9 body is warranty-free and may result in short circuits.We recommend this method only to users with experience in soldering microelectronics.

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The most reliable and safe way is to use an external Qi receiver with a connector. USB-C. It does not require disassembly of the smartphone and is compatible with most wireless stations.

7.How to check the speed of wireless charging?

To make sure the adapter is working correctly, measure the charging speed.

1. Discharge the Redmi 9 battery to 20%.
2. Connect your smartphone to a wireless station.
3. Launch the Ampere app (available on Google Play).
4. Record the current (in mA) in 5-10 minutes after the start of charging.

Normal values for Redmi 9:

• 🔋 5W — Current 500–700 mA (slow charging).
• ⚡ 7.5W — current 800–1000 mA (average speed).
• ⚡⚡ 10W — 1200-1500 mA (maximum for adapters).

If the values are below 400 mA, check:

• Quality of contact between the adapter and the station.
• Power of the power supply unit of the station (must be at least 2A).
• The temperature of the smartphone – when overheating, the controller limits the current.

Note: Wireless charging is always slower than wired charging. for Redmi 9 with adapter 10W The full charging cycle will take about 3-4 hours (versus 2 hours on the wire with the 18W).

FAQ: Frequent questions about wireless charging for Redmi 9