Legion Go - Charging from battery (SHARGEEK STORM 2)

Hi all. Recently I purchased my first Legion product Legion Go. It fits perfectly my use case and I love it so far. I am aware that there is lot to be done before it reaches its maturity so I am forgiving regarding software issues. However I have one issue that is creating problems for me. I have SHARGEEK STORM 2 battery (100W top output) that I was planning to use to charge my Legion Go. Problem is, when I plug it in Legion Go, device starts charging my battery and not other way around. My 100W USB-C port on the battery is IN/OUT but I never had such issue before. For some reason Legion Go doesn't see SHARGEEK STORM 2  as battery. Anybody else with similar issues?