1954 Carbon-zinc batteries R20s,R14s,R6s 1979 Heavy duty Carbon-zinc batteries R20c,R14c,R6c 1900 Super heavy duty Carbon-zinc batteries R20p,R14p,R6p 1992 Mercury and cadmium free batteries R03p 1994 Mercury free LR6 alkaline battery 1996 Mercury free LR03 alkaline battery 2001 Mercury free LR20&14 alkaline batteries 2002 Mercury free 6LR61 alkaline battery 2003 Mercury free LR1,4LR61,LR8D425,3LR12,4LR25,ZR6 alkaline batteries