Is there a way to control Power Delivery direction on Powercore Elite III?

I have a Powercore Elite III 87W I’d like to use to charge a chromebook. If I use a USB-A port on the power bank it works. If I use a USB-C port on both sides they will decide I want to charge the power bank from my chromebook - NOT what I want. Is there some magic incantation of button presses that will change this? I should be able to charge my chromebook much faster if I use a USB-C port on both sides but the charging goes the wrong way.

Alternatively, is there some gadget I can put in between the devices to spoof them into sending power the other direction?

It’s also possible there is a setting in my chromebook to control this, but I haven’t found it.

Open to any thoughts! Thanks in advance.

Typically if you want the Powercore to send power you simply press the power button so lights on, then quickly plug into device.

If lights off then it will receive power.

So the magic incantation is just a brief tap of the button.

A brief search finds this

It was the first hit when searching.

http://community.anker.com/search?context=topic&context_id=90369&q=Elite%20III%20manual%20order%3Alatest&skip_context=true

I would say RTFM but even knowing what I know the manual isn’t clear, it’s implied as if you look it says press button to charge and not when you want it to be charged.

Also their manuals have been rather small so older folks need:

image

This doesn’t work for me, and it’s not how I read the manual. When I look at the page on trickle-charging it clearly says to press the button twice. I don’t see where it says to press once to control the direction of power delivery.

As I understand it, when you connect two PD devices via a usb-c cable the two sides negotiate, and most of the time that algorithm works. But when you connect a laptop with a power bank what you want is ambiguous. I might want to use my laptop as a charger for the power bank or I may want to charge my laptop. I’m looking for a way to override the algorithm.

Now it may be that my chromebook should be the one controlling this but my chromebook is too primitive to have that control. And it may be that I’m being dense and just haven’t figured this out yet.

I’m pretty much out of ideas at the moment.

Begin with no lights on.

Press the power button once briefly until lights come on.

Plug into laptop a USBC cable from the Powercore USBC port to the recharge input USBC port of laptop. It charges the laptop.

Still not really working as described. There are a few other variables though. I tried different cables and that didn’t make a difference. All were Anker Powerlines of different lengths and generations. What did make a difference was the laptop. When I attach the powerbank to a Lenovo Thinkpad X270 the powerbank charges the laptop whether I press the button first or not. When I do the same thing with an inexpensive Samsung Chromebook 4 the chromebook charges the powerbank, again whether I press the button or not. It may have something to do with the fact that the Thinkpad can accept a charge from the USB-C port or a dedicated power adapter, while the Chromebook can only be charged from the USB port. At any rate there doesn’t seem to be a way to override the results of the negotiation and force the direction of charging. Ravpower powerbanks do have this functionality and I was hoping to find the same thing with Anker.