How to make wireless charging for Xiaomi Redmi Note 9: 3 proven ways

Xiaomi Redmi Note 9 is still one of the most popular smartphones in the budget segment, but its main drawback is the lack of factory support for wireless charging. While flagship models have long been equipped with this feature, owners of the Redmi Note 9 have to look for workarounds. Fortunately, you can add wireless charging yourself — and it does not need to disassemble the phone or buy expensive accessories.

In this article, we'll look at three working methods: from the simplest adapter sticker to a full-fledged rear-lid replacement, which modules are right for the Redmi Note 9, how to avoid battery overheating, and why not all wireless charging is equally useful, and why cheap Chinese solutions can burn down your smartphone's power controller and how to prevent it.

1. Compatibility check: Can you make wireless charging on the Redmi Note 9?

Before you spend money on components, you need to know if your Redmi Note 9 supports wireless charging at the hardware level, because even if the phone doesn't have an integrated coil, its power controller can be compatible with external modules.

• 🔍 Phone model: Make sure you have a Redmi Note 9 (codenamed merlin) and not a Note 9 Pro or Note. 9S — They have other boards and batteries.
• 🔋 Battery type: Redmi Note 9 uses battery LB4334 (5020 mAh. It has no built-in coil, but it supports current up to 2A wire-charging.
• 📱 Version. MIUI: On old firmware (below) MIUI 12.5) may have problems recognizing external chargers. Update your phone to the latest version.

The easiest way to check compatibility is to bring the Redmi Note 9 to any wireless charger (like a different phone), if the charging icon appears on the screen, the power controller is ready to work with the external module, if not, you will have to use a cheat adapter (we will talk about it in the third method).

⚠️ Note: If your phone is already modified (e.g., a battery or board has been replaced), wireless charging may not work smoothly. №2 with an external receiver.

2. Method 1: Adapter sticker (the easiest way)

This is a solution for those who don't want to take the phone apart, and the sticker adapter is a thin wireless charging receiver that attaches to the back cover and connects to the connector. USB-C. It converts the energy from the charging station into a wired signal that the phone perceives as a normal charge.

Pros of the method:

• ✅ It doesn't require disassembling the phone.
• ✅ Compatible with any Qi charging station
• ✅ You can easily remove and transfer to another phone.

Cons:

• ❌ Slow charging (maximum) 5W)
• ❌ Uncomfortable to use with a cover
• ❌ Risk of damaging the connector USB-C frequent-connection

The following adapter models are suitable for Redmi Note 9:

• 🛒 Nillkin Magic Tag is thin and reliable, but expensive (~1500 ₽)
• 🛒 Baseus Wireless Charger Receiver – Budget version (~800 ₽), thicker
• 🛒 Xiaomi Mi Wireless Charging Receiver is the best choice, but it’s hard to find on sale

Installation instructions:

1. Clean the back cover of the phone of dust and grease (use alcohol wipes).
2. Remove the protective film from the sticker and attach it to the center of the back panel (where the logo is usually located).
3. Connect the adapter plug to the connector USB-C phone.
4. Place your phone on a wireless charging station. If charging hasn't started, try to shift the phone 1-2mm.

Uses the Qi standard (not proprietary)

No more than 2 mm thick (otherwise it will not fit in the case)

There's overheating protection.

Compatible with fast charging (if you need a higher speed) 5W)

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Important: Adapter stickers do not support fast charging on the Redmi Note 9 due to power controller limitations — 5W, Even if the charging station is 10W or 15W.

Method 2: External receiver with rear cover replacement (optimum)

If you're willing to work a little harder, this method will give you a more reliable and aesthetic result, and the idea is to put a wireless charging receiver under the back of the phone and connect it to the battery contacts, so you can charge wirelessly at speeds up to the end of the phone. 10W (provided a compatible charging station).

What you need:

• 🛠️ Receiving module Qi (e.g, WL-S03 or WL-S05)
• 🔧 New back cover (preferably with a cutout for the module)
• 🔥 soldering iron with a thin sting and solder
• 🧲 Double-sided tape or glue B-7000 fixation
• 🔌 Multimeter for checking contacts

Step-by-step:

1. Disassemble the phone: Turn off the Redmi Note 9 and remove the tray for SIM-Heat the back cover with a hair dryer (temperature) ~80°C) and gently tuck it in with a plastic spatula. Start at the corner near the connector. USB-C. Disconnect the battery plume (use plastic tweezers to avoid damaging contacts).
2. Installation of the module: Try the receiver module on the inside of the cover. It should be in the center, without overlapping the camera or sensors: + ce +, – K-- For safety, use a heat-shrink tube, hold the module with double-sided tape or glue, make sure it doesn't touch the metal parts of the case.

Assembly and testing:

• Connect the battery plume and check if the phone is switching on.
• Install the back cover in place (use a new glue if necessary).
• Place your phone at the charging station. If charging doesn't start, check the polarity of the wires.

⚠️ Warning: If the phone gets too hot or discharges quickly after installing the module, turn it off immediately. This is a sign of short circuit or improper connection!

Adapter sticker (simply and without disassembly)

External receiver under the cover (faster and more reliable)

Modification with battery replacement (maximum power)

Buying a new phone with wireless charging

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Method 3: Replace the battery with a wireless charging model (for advanced)

It's the most radical, but it's also the most efficient way to do it, instead of a standard battery. LB4334 A battery with a built-in Qi coil is installed, for example, from the Redmi Note 10 Pro or POCO X3 Pro. This upgrade allows you to charge at power to 18W (If the phone controller supports).

Advantages:

• ⚡ Maximum charging speed (up to) 18W station-compatible)
• 🔋 No extra wires and modules inside the body
• 📱 The original design is retained (no need to change the cover)

Disadvantages:

• ⚠️ Complex installation (needs experience with soldering iron)
• 💰 Expensive (a battery with Qi costs) ~2500–3500 ₽)
• ⚖️ Risk of losing the guarantee (if it is still valid)

Which batteries are suitable:

• 🔋 Redmi Note 10 Pro (LB4434) — 5020 mAh, Qi support 18W
• 🔋 POCO X3 Pro (LB4434) — similar but cheaper
• 🔋 Custom battery with AliExpress (see "Redmi Note 9 Qi battery" for the first time")

Instructions for replacement:

1. Disassemble the phone (as in method 2) and remove the old battery.
2. Disconnect the plume and gently unseal the contacts of the old battery.
3. Install a new battery, plug in the plume and check for polarity.
4. Seal the contacts, isolate them with captone tape.
5. Collect your phone and test charging at a wireless station.

Important: When you replace the battery, the Redmi Note 9 may give you a warning about an "unoriginal battery." This is not critical, but if you want to get rid of the message, you'll have to turn off the check through the phone. ADB:

adb shell dumpsys battery setAcbUnknown 1

(The team is running until the first reboot).

5. Charging station choice: which one is right for Redmi Note 9?

Not all wireless charging is equally useful. For the Redmi Note 9, it's important to choose a station that:

• 🔌 Supports Qi-standard (non-proprietary solutions like: PMA)
• ⚡ It has power at least 10W (for methods 2 and 3)
• 🔥 Equipped with protection against overheating and overload

Best options (in terms of price/quality):

Selection advice:

• 🔍 If you use method 1 (sticker), enough charging for 5W — Don’t overpay for powerful models.
• 🔋 For method 2 or 3, take the station to 10W–15W (For example, Baseus or Xiaomi).
• 🚫 Avoid cheap no-name charges – they can damage your phone’s power controller.

💡

If the charging station is very warm, put a thin silicone stand under it or use a model with a fan (for example, Yootech Wireless Charger).

Possible problems and solutions

Even if you do it right, you can have difficulties, and here are the most common ways to fix them:

• 🔴 Phone not charging: Check if the module is correctly positioned (for methods 1 and 2). Make sure the charging station is plugged in and running (try charging another phone). If you use an adapter sticker, try another cable USB-C.
• 🔥 Phone overheats: Remove the case while charging. Use a vent station or take breaks every 30 minutes. Check if the module wires are closed (method 2).
• ⚡ Slow charging (longer than over the wire): This is normal for wireless solutions.max for Redmi Note 9 — 10W (method 2 and 3). If the speed is critically low (<1W), Check the compatibility of the station and module.
• 📵 Charging interrupted: Try to shift the phone at the station by 1-2 mm. Make sure that the module (method 2) is free of foreign objects (dust, metal particles).

⚠️ Warning: If the phone is rapidly discharged in standby mode after the modification, this may indicate a current leak due to poor wire insulation. Disassemble the phone and check all connections with a multimeter!

7. Alternative solutions: if nothing has worked

If wireless charging never worked, or you don’t want to take the risk, there are a few alternatives:

• 🔌 Magnetic cable: Baseus Magnetic Charger – fast connection, almost like wireless charging, but without power loss.
• 🔋 Powerbank with wireless charging: Carry an external battery (e.g. Xiaomi Mi Power Bank 3) 10000mAh) and charge the phone over the wire from it.
• 📱 Phone Update: If the Redmi Note 9 is already failing, consider the factory-powered wireless charging models: Redmi Note 12 Pro+, POCO F5 Pro or Xiaomi 13 Lite.

Comparison of alternatives:

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If you want the maximum charging speed, wireless solutions for the Redmi Note 9 will not work – even after the modification, you will get no more than a few more. 10W. In this case, it is better to consider a magnetic cable or phone upgrade.

FAQ: Frequent questions about wireless charging for Redmi Note 9