Here's a little comparison between the Moto Z Play's speaker and the JBL: https://www.youtube.com/watch?v=Vzj2JZ5Yq28
So it will run the JBL battery down to 0 then run off the phone battery when you are playing music?
Mine ran down to 10percent and wouldn't function anymore. It's still supposed to right?
Pretty sure it's supposed to be able to run off the phone's battery, but I haven't personally tested that. Maybe I've misunderstood, or been misinformed.