Can You Charge Your Laptop With A Usb

Can You Charge Your Laptop with a USB?


In this article, we will explore the topic of charging laptops using USB cables. We will delve into the technical aspects, compatibility issues, and potential limitations associated with this method.

USB Charging Standards

USB Type-A and Type-C

USB (Universal Serial Bus) is a widely adopted interface for data transfer and power delivery. USB Type-A connectors are the traditional rectangular ones commonly used for connecting peripherals like keyboards and mice. USB Type-C connectors are newer, smaller, and more versatile, supporting higher power delivery and data transfer speeds.

USB Power Delivery (PD)

USB Power Delivery (PD) is a protocol that enables higher power delivery over USB cables. It allows devices to negotiate and deliver up to 100 watts of power, making it suitable for charging laptops.

Compatibility Considerations

USB-C Laptops

Many modern laptops, especially those with slim profiles, are equipped with USB-C ports that support both data transfer and power delivery. These laptops can be charged directly using a USB cable if the following conditions are met:

  • The laptop’s USB-C port supports power delivery.
  • The USB cable has a USB-C connector on both ends.
  • The USB cable supports the required power delivery standards (USB PD).

Non-USB-C Laptops

For laptops without a USB-C port, there are adapters available that convert the traditional DC charging port to USB-C. These adapters typically support USB PD and allow laptops to be charged using a USB cable.

Power Limitations and Charging Times

Charging Speed

The charging speed of a laptop using a USB cable will depend on the following factors:

  • The power delivery capabilities of the laptop’s USB-C port
  • The power delivery capabilities of the USB cable
  • The capacity of the laptop’s battery

USB PD supports different power delivery levels, ranging from 5V/3A (15W) to 20V/5A (100W). Laptops typically require a higher power delivery to charge quickly.

Charging Times

The time it takes to charge a laptop using a USB cable will vary depending on the charging speed and the remaining battery capacity. Generally, a 100W USB PD charger can charge a laptop with a 50 Wh battery in about 1-2 hours.

Advantages of USB Charging

  • Convenience: Using a single USB cable for both data transfer and charging eliminates the need for separate power cables.
  • Versatility: USB-C cables are compatible with a wide range of devices, including smartphones, tablets, and external hard drives.
  • Portability: USB chargers are lightweight and compact, making them easy to carry around.

Limitations and Considerations

  • Not Universally Supported: Not all laptops support USB charging, especially older models.
  • Power Delivery Limitations: USB cables may not deliver enough power to charge some high-performance laptops.
  • Cable Quality: Using high-quality USB cables is essential for reliable charging and data transfer.


Charging laptops using USB cables is possible for laptops with USB-C ports that support power delivery. Non-USB-C laptops may require adapters to enable USB charging. While USB charging offers convenience and versatility, it may not be suitable for all laptops due to power delivery limitations and compatibility issues. It’s important to verify compatibility and consider the charging speed and other factors before relying solely on USB charging for your laptop.

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