Battery charging on/off/on/off/on/off

Hey,

I have problem. My battery was charging only to 82%, on this value its turning on/off every sec.
Next day it was only 74% and today its 64% and dont wanna go up... I tried to calibrate battery already. HELP PLEASE!!

Regards

from xda-developers http://ift.tt/2bUqeQF
via IFTTT