Nowadays many of us are using UPS/ Battery as power backup source. Recently I read an article related with this as referenced below. It may cause serious health hazard in some situation. Any authenticity of such report?

Does it due to radiation/ Fumes /sound? Would you like to share your knowledge and discuss their experiences in term of health hazards? Reference : http://njnnetwork.com/2010/03/your-ups-battery-backu-may-be-killing-you/