htc one mini m4 battery problem

Hi, i have problem with my m4.

im on sof. 4.4.2. and it is not rooted ... have problem last days.
When i charge it to 100%, everyting is okey, how im using it trought day ( not playing games and not have any instaled NEVER )
only viber, phone calls, facebook, text msg ... noting spec.
battery came to 20 or 30 % its phone just turn of ...

i have instaled some battery saver and trayed with him, it is same problem.

When i plug in ac adapter, it is charing from 0 % ...
Does have somebody same problem like me, or can somebody help me to fix it ...

Tenx