The Duracell 7K67 (J) battery is an alkaline battery used to operate medical devices and photo equipment. This battery compares to the Energizer J battery 539. Medic Batteries carries high quality Duracell 7K67 batteries that are properly stored and 100% guaranteed. Each Duracell 7K67 battery is low priced and ships free. Choose the Duracell 7K67 over the Energizer 539. Choose Medic Batteries!