MicroUSB? C’mon we need USB-C!
The microUSB is for charging. For output to a different USB connection, just use a cable that has a USB end.
RAVPower Support says that despite Woot.com being a Amazon.com website and the orders fulfilled and shipped by Amazon (mine was, by AmazonPrime Delivery actually), that these cannot be registered for warranty.
And for the record I’m going with the username “FeatheredSerpent” because of Nahuatl legends and because “Quetzalcoatl” was taken. “FeatheredSerpent” is the transcription into modern English quite literally and essentially means “Dragon” and no not “Michael” or “Dragotta” you jerks.
I don’t know if you bought the power bank from this listing or the one 20 days ago, but did you reach out to Woot CS?
From a browser, use the Woot! Customer Service form. In the Woot! App, choose Account from the bottom navigation and then Support.