A power bank still detects a connected device if I disconnect USB's VBUS

[epigramx]

Do you know of a way to do it - in a standard way - without disconnecting the entire cable? Would disconnecting only GND do it (will try that next if no one answers)?

PS. In case anyone wonders why, it's because I can't change the power bank's model/brand and it doesn't fast-charge itself, if anything else is connected to it.

[malagas_on_fire]

what about a cable with a built-in switch:

https://www.ebay.com/itm/1-3-pcs-Micro-USB-Power-Cable-with-ON-OFF-Switch-for-Raspberry-Pi-Durable-/132925734304

[amyk]

It senses the data lines too.

[epigramx]

Another forum suggested to just switch the GND because it will make the other pins float. I guess I'll try that next.

what about a cable with a built-in switch

I'd rather avoid that due to cost and space. Plus, it probably only does what I already do (since it's called "power cable").

It senses the data lines too.

[epigramx]

success, dangling GND made the power bank completely oblivious anything is connected to it.

[bson]

The host doesn't care if a device is attached to Vbus or not.  What it detects is pullups on the data lines.

[epigramx]

The host doesn't care if a device is attached to Vbus or not.  What it detects is pullups on the data lines.

So I guess it detects a specific range of resistance between GND and D+ or/and D-.

[bson]

Depends; different pullups indicate different speed... so the pullups are used to both detect the presence of a device and its speed.

For USB 2, a 1.5k pullup on D+ to +3.3-5V indicates Full Speed.
A 1.5k pullup on D- indicates Low Speed.

A high speed device connects as FS and then goes through a special reset cycle (a chirp) to bump the speed to HS.

[epigramx]

Depends; different pullups indicate different speed... so the pullups are used to both detect the presence of a device and its speed.

For USB 2, a 1.5k pullup on D+ to +3.3-5V indicates Full Speed.
A 1.5k pullup on D- indicates Low Speed.

A high speed device connects as FS and then goes through a special reset cycle (a chirp) to bump the speed to HS.

Since this is only a charger in effect (a power bank) I guess it only detects anything in that range.
If they are floating, I assume it considers it higher than that impedance. Correct me if I'm wrong.

update: It's Quick Charge 2.0 compliant so it does deal with D+/D- actively.