[klempner]

The vast majority of C to C "charge" cables are USB 2 cables. I don't believe I have ever received or even seen a "charge only" non-captive C to C cable. A to C cables are a lot more common.

Do you have reason to believe that the C to C cables you got/bought don't support USB 2?

It doesn't make sense for a random accessory to come with a charge only C to C cable because USB 2 C to C cables are a dime a dozen. They're almost certainly paying more money to produce a spec violating cable.

[hedgehog]

They could have data support, I've never actually checked. The wires are pretty thin so I only trust them for charging the lights they came with. I have a bundle of similar looking A to mini or micro B cables of which I know many are charge-only. As long as they're super short I only rely on them being useful for charging.

[klempner]

In that case they almost certainly do have data support.

Keep in mind that power dissipation scales with the square of the current. That means that, as a first order approximation, relative to household 15 amp wiring, a 3 amp cable can be 1/25 of the size. You can get away with really thin wires for that.

The reason why you end up with thick USB C cables is because of either 5 amp support (requiring 2.8x bigger wires) and/or USB 3 support (requiring a bunch of extra higher spec wires). It is quite normal for plain old 3 amp USB 2 USB C cables to be thin.

[hedgehog]

I'm curious, next time I'm charging devices I'll check. Either way they're still not useful for anything beyond accessory charging, they're short and won't carry the power+signal necessary for my laptop (which, sigh, has two kinds of cables because the one Apple provided with their charger won't do Thunderbolt).