Extreme 2 not turning on, unless plugged. No buttons are working

Hello all,

I had bought this JBL extreme 2 in November 18, put it in a closet for almost a year while it was still working back then.

Today I wanted to use it again but faced some problems.

Battery was obviously down, so I charged it. Charge did his job as all the led lights worked in the end.

When I unplug, no button is working. Not going on. When I plug, it turns on. I cant turn it off. Can’t activate bluetooth. Short story: 0 buttons are working. When I unplug again the device goes off but cant POWER ON again.

Already tried factory reset and everything. Nothing works.

Where can be the problem?

Thanks ahead!