How to get a USB battery bank to “wake up”?

[formatview]

Hi,

I have this battery bank. https://iniushop.com/products/iniu-megapower-20000mah-portable-charger

I’m powering the raspberry pi with a usb cable which has an on/off switch (to avoid draining the battery).

If I shut down the pi and turn it off via the switch I can turn it back on within a minute or two. However Some time after the Pi has shutdown and been turned off with the switch, the battery bank seems to go into a sleep mode of sorts. At this point flipping the switch does not get it to turn back on. I even tried a different usb cable putting a switch on the red wire.

If I unplug the usb cable to the pi from the battery bank and then plug it back in again it seems that the battery bank detects that there is something plugged in and the pi powers on.

Is there any way to manually ‘trick’ the battery bank to power on? Could doing something like grounding the data pins with a momentary switch work?