"It’s the most common USB connector, and whenever someone says “USB” you can reasonably assume they’re referring to USB Type A. Most likely, your cell phone charger has a USB Type A connection, too. Unfortunately, while you can use Type A to power smart devices, you can’t use it to power your laptop.
Type A can exchange a sizeable amount of data, but it’s not capable of transferring the huge amount of power that’s needed to replenish your laptop battery. Type A just can’t deliver enough wattage."