Xiaomi RedmiBook 4 laptops continue to be a popular choice among users who value the balance of performance and availability. However, when buying accessories or repairing, there is often confusion about the types of connectors — especially when it comes to charging ports. Unlike smartphones, where USB-C has long become the standard, laptops still use a variety of solutions.
In this article, we will take a closer look at what connector is used in RedmiBook 4 (including the RedmiBook 4 Pro and RedmiBook 4 Air versions), what its specifications are, and how to find the right compatible charging, and you will learn about the typical problems with the port, how to diagnose them, and the nuances of using alternative adapters, if you are planning to buy parts or just want to understand the hardware of your device, this information will be useful.
Official characteristics of the Xiaomi RedmiBook 4 connector
All RedmiBook 4 models (2023-2026) feature a USB-C charging port with USB Power Delivery (USB-PD) support, which means that the laptop can be charged not only with the original adapter, but also with other devices with a similar protocol, such as charging from Xiaomi or Apple MacBook smartphones (if power is observed).
It’s important to clarify that despite the presence of USB-C, not all cables and adapters are suitable for full charging. The fact is that the RedmiBook 4 requires a minimum power of 65W, and the original power supply gives 100W. Using less powerful charges (for example, from a smartphone on 18W) will lead to slow charging or even battery discharge under load.
- 🔌 Type of connector: USB Type-C (USB-C) Thunderbolt 4 (in the RedmiBook 4 Pro version).
- ⚡ Charging power: the original adapter — 100W (20V/5A).
- 🔄 Protocols: USB Power Delivery 3.0 (USB-PD), Quick Charge 4+ (optionally).
- 📦 Additionally: the port supports data transfer (USB 3.2 Gen 2 and video output (DisplayPort Alt Mode).
Note: The budget version of RedmiBook 4 Air may not support Thunderbolt, but the charging port remains the same – USB-C. This is important to consider when choosing docks or external GPUs.
How to distinguish the original connector from a fake
Xiaomi’s accessories market is oversaturated with counterfeiting, and charging ports are no exception, and fake connectors can not only hold contact poorly, but also cause overheating or even short circuits.
⚠️ Note: If the connection charger heats up above 50°C for 10 minutes is a sign of a malfunction of the port or power supply!
- 🔍 Marking: The original port has laser engraving inside the connector USB-C Xiaomi logo.
- 🛠️ Build quality: contacts must be symmetrical, without backlash. Counterfeiters often have curved or scratched connectors.
- 💡 Indication: when you connect the original cable charging indicator lights up immediately (in fakes there may be a delay).
- 📏 Dimensions: thickness of the connector body - 2.4 mm (for fakes, it is often thinner).
To authenticate, you can use a USB-C tester (such as the USB-C Tester from Satechi), which will show the real power and supported protocols. If the tester gives an error "PD contract failed" - the adapter or cable are incompatible.
What to do if the connector is shattered?
Compatible chargers: what can be used instead of the original
The original Xiaomi 100W GaN adapter (the ADP-100CYD model) is optimized for the RedmiBook 4, but not always available. Fortunately, the laptop supports a wide range of alternative charging options - provided two rules are met:
- The power of the adapter is at least 65W (optimally 100W).
- Support for USB Power Delivery 3.0 (USB-PD)
| Charging model | Power | Compatible with RedmiBook 4 | Notes |
|---|---|---|---|
| Xiaomi 100W GaN (ADP-100CYD) | 100W | ✅ Complete. | The original adapter, the best choice. |
| Apple 96W USB-C (A1718) | 96W | ✅ Complete. | Suitable for the RedmiBook 4 Pro, but can be underpowered when loaded. |
| Baseus 65W GaN (BS-PD65W) | 65W | ⚠️ Partial | Charges only in standby mode or at low load. |
| Anker 735 (Nano II 65W) | 65W | ✅ Complete. | Compact size, supports USB-PD 3.0. |
| Samsung 45W EP-TA845 | 45W | ❌ Incompatible. | Too low power - the laptop will discharge. |
If you use a smartphone charger (such as the Xiaomi 33W), the laptop may not charge at all or it may be extremely slow, and in some cases the system will even issue a warning: “Connected charger is not supported.”
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Before buying an alternative charger, check its certification on the USB-IF website. Devices with the USB-IF Certified logo are guaranteed to support USB-PD.
Typical Charging Connector Problems and Their Solutions
The USB-C port in RedmiBook 4 is one of the most vulnerable places due to frequent connection/disconnection of the cable.
- 🔌 Laptop doesn't charge: Check the cable - try another, certified USB-C. Clean the port of dust with compressed air or a soft brush. Reset the power controller: turn off charging, press the power button for 30 seconds.
- ⚡ Slow charging: Use a power adapter 65W+. Close resource-intensive applications (such as games or rendering). BIOS laptop through Mi PC Suite.
- 🔥 The connector warms: Turn off the charging and let the port cool. Check the cable for damage (melt, bare wires). Use the original adapter - cheap analogues often overheat.
⚠️ Warning: If the laptop is still not charging after cleaning the port, do not try to move the cable inside the connector - this can damage the contacts.
For the prevention of problems, it is recommended:
Carefully insert/remove the cable without putting any effort into it.|
Use a laptop case to avoid dust |
Regularly update BIOS and power management drivers |
Avoid cheap cables without USB-IF certification
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Can I charge RedmiBook 4 via Power Bank?
Technically, yes, but with reservations: RedmiBook 4 requires high power (65W+), so not every power bank will work.
- 🔋 Capacity: at least 20,000 mAh (otherwise it will discharge faster than the laptop charges).
- ⚡ Power: The outlet port must support USB-PD 65W+.
- 🔌 Connector: only USB-C (Micro-USB or Lightning will not work).
From the tested models, it can be recommended:
- Xiaomi Mi Power Bank 3 20000mAh Pro (100W USB-C) is the best choice.
- The Baseus 65W 20000mAh is a budget option, but requires a full discharge of the laptop before connecting.
- Anker PowerCore 26800 PD 60W – suitable for emergency charging (not 100%).
Important: when charging through the power bank, the laptop can shut down under load (for example, when starting games), this is due to the limitation of the power of mobile batteries, and for stable operation, it is better to use a network adapter.
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Charging through Power Bank is a temporary solution. A 100W network adapter is recommended for permanent use.
Frequent questions about the RedmiBook 4 connector
Below we have collected answers to the most popular user questions related to the charging port Xiaomi RedmiBook 4:
❓ Can I use a MacBook charger for RedmiBook 4?
❓ Why does the laptop charge only when it is off?
❓ Can I connect an external monitor via the charging port?
❓ How to check the wear of the charging connector?
Conclusion: What is important to remember
Xiaomi RedmiBook 4 uses a USB-C connector with USB Power Delivery 3.0, but that doesn’t mean any charging with such a port is suitable. For stable operation, you need a 65W+ adapter, or better, the original 100W from Xiaomi.
If you have problems with charging, check the cable and power supply first, then clean the port of dust. If the laptop does not charge even with the original adapter, this is an occasion to check the battery or power charge at the service center.
Remember, using uncertified accessories can not only reduce charging speed, but also disable the power controller. In case of doubt, always give preference to proven brands (Anker, Baseus, Xiaomi).