Well that explains it, as i have yet to get up to speed with the C stuff. I do recall though that older stuff should have a resistor in the charger itself to note if it is a charger port or not (if it does not have the electronics to do proper handshake on the data pins).

Sadly Apple have a variant of that floating around, resulting in confusion and devices that can do 500mah to anything, and 2400mah to Apple devices. Or anything if you fake them out via rigged cables etc, giving us the monstrosities called "charge only" cables.