directionally constrain PD charge?

[cultronk]

Johnny has 2 power banks.  The first one is smaller and running low. It is capable of 90w input.  The larger one is fully charged. Each of its 2 ports is capable of 100w output.  They both speak only PD3.0 on type C.  The small one always insists on being the source -- never a sink.  How can Johnny force the smaller one to be a sink to the larger one?

 

Is there an inline adapter for 100w or 240w emarked type C usb cables (2.0 or 3+) to filter the PD conversation making a cable unidirectional for charging?  or a cable? or even a usb multimeter?

 

 

 

 

 

[Kilrah]

Tried powering on the large one, connecting the cable to it, then connecting the cable to the small one while it's still off?

[Heats with Nvidia]

It just asserts its dominance over the weaker power bank. Thats normal behaviour, especially in mating season.

 

Jokes aside, maybe try combinations of the other outputs it might have?