Instead, you have a few basic rules of USB charging that often get bent or broken - thanks to the different flavors of USB connectors shipped since the Universal Serial Bus's debut in the late '90s.įirst, any laptop that's awake should charge any device plugged into it, even if the computer isn't plugged into the wall. If only charging one mobile device from another had the same boring predictability of plugging a charger into a wall outlet. Is there an easy way to figure out if a USB port can charge a phone when the laptop is asleep or even powered off?Ī.
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