okay, so.. i have changed battery ... nothing happened same problem. i have disabled every single app i could.. nothing helped.. i didnt knew what else to do .. phone was and still is ok.. so i have opened back cover unpluged fingerprint sensor and right tiny black wire just beside battery on the right.. since i didnt knew what it was.. i have tryed everything.. and wifi works speaker works everything actually worked normaly.. my battery is okay now..
ps.. disabling google duo didnt help at all .. calibration didnt help either.. so belive. it or not my battery is ok now.. hope ill help somebody.. i usually dont writte this kind of stuff nowhere but i was desperate with my phone and i just felt i had to share my experience..