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> Powering something off of any old USB port means it would have to fit within the 5V 500mA basic specification, which the Raspberry Pi 3 exceeded long ago. In
by mschuster91 5mo ago
> Powering something off of any old USB port means it would have to fit within the 5V 500mA basic specification, which the Raspberry Pi 3 exceeded long ago.
In practice most USB wall warts will happily provide 2 amps or even more with no overcurrent protection at all. The 500 mA limitation, at least outside of ports on computers (where you'll maybe get a prompt on Windows and macOS), is theoretical.
- robocat 5mo agoIrrelevant... They need to stick within limits to avoid liability (and avoid arseholes blaming them on forums). Someone would get a problem with their computer or TV, and then blame Raspberry Pi (or create a problem).