The Tap was fully charged, and just sitting on desk with power light off (I had pressed it off). 24 hours later when I went to use it, the battery level had dropped 10%. HUH? I thought I turned it off. Not exactly; seems I had put it in Sleep mode. Tonight, I figured out how to get to completely off, and since I had not read anywhere how to do it, I went looking for instructions and they are here:
https://www.amazon.com/gp/help/customer/display.html?nodeId=202014750When it is turned back on, it has to reboot; just like when power is turned off the Echo.