"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 ports require a power-negotiation handshake before supplying power. Some low-cost devices omit minimal internal components (often two resistors) to save money, so USB-C chargers do not provide power to them. USB-A ports provide a default 5V without negotiation, so devices designed without USB-C negotiation hardware will charge from USB-A power. A common sign of this limitation is a device shipped with a USB-A-to-USB-A cable. Portable devices such as inexpensive thermal label printers can therefore appear to have nonfunctional USB-C charging unless a USB-A power path or compatible charger is used.
Read at ZDNET
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