Is there (preferably) an app that will check the health of power banks? Ideally similar to apps that do this for cellphones? I'd like to know remaining capacity, cycles used, etc... There are lots of USB widgets that provide some info for power bank; any clue which might actually work best? We've been pounding on the power banks quite a bit more than usual during the pandemic, because of all the Zooming.... it would be nice to know what we're dealing with. Can't find anything for the Macs that says it will work for an external power supply.

Thanks.
==

USB gizmo.