I just simply can not get my E07K to boot without it being on a charger. When it's connected to the charger it boots up fine, and shows that it is full charge, but as soon as I unplug it, or turn off usb charging it dies and will not boot. I'm thinking it's the battery, but hopefully there's a...

Okay so I've been looking around the internet for headphones to buy and I've managed to narrow it down to a few   Ultrasone HFI-780 Audio-Technica ATH-M50 beyerdynamic dt 770 pro   I mostly listen to metal/deathcore that kind of stuff. I don't really know a lot about specs and what...