"Although the printer may have a USB-C port, it lacks the necessary hardware to support USB-C charging protocols. On a more technical level, the manufacturer opted to save a few cents by omitting some basic components (typically just two resistors, which cost virtually nothing) to accommodate different power inputs. Since USB-C doesn't supply power without first negotiating what the device needs, no power is delivered."
"While USB charging is an improvement over the mess of proprietary connectors and protocols that preceded it in the past, it's still not the utopia the tech industry wants you to believe it is. Here's a good example. I have a portable thermal label printer that I've found to be just so useful for keeping things organized -- it prints really clear labels that are resistant to water, oil, acid, and heat. It's also powered by a built-in rechargeable battery."
USB-C charging requires a negotiation handshake before power is delivered. Some inexpensive devices omit the small components needed for that negotiation, preventing any power delivery from a USB-C charger. Manufacturers sometimes remove simple parts (often two resistors) to reduce costs, causing devices with USB-C ports to remain unpowered when connected to USB-C chargers. USB-A provides a default 5V without negotiation, so using a USB-A to USB-C cable can bypass the handshake and allow charging. A common indicator of the omission is inclusion of a USB-A to USB-A cable with the device. Cheap portable gadgets can therefore appear identical but behave differently when charging.
Read at ZDNET
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