JBL Xtreme 2 no sound when on battery

I have a weird issue with my Xtreme 2, it works fine when plugged in but when i disconnect charger sound cuts off, speaker keeps turned on when disconnected and my phone keeps connected to it via BT, power bank function works as well and battery charges when plugged. I've tried hard reset, going into and out of demo mode and pretty much any button combo i've found online to no avail. Its on latest version of firmware (2.7.0). Has anyone encountered similar issue?