Okaya Power Group, a battery manufacturing company, has appointed Atish Bhattacharya as the Head of Human Resources & Administration. Before joining Okaya Power Group, Bhattacharya was Vice President of Human Resources at Ozone Overseas. He has also worked at Greenlam Industries, AccorHotels India, Bharti Infratel, Samsung India Electronics, Voltas, and Larsen & Toubro. Bhattacharya has…