Discover's batteries are sealed, non-spillable, non-gassing and non hazardous. They are maintenance free and have a gas recombination of 99.9%. They are constructed of the thickest plates and the highest oxide densities to increase life and capacity. Recyclable and made with recycled products. Exempt from HAZMAT shipping requirements. Compliant with LEED (USGBC). Compliant with OSHA Occupational Health and Safety Regulations.