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== Timeline ==1859 - French physician Gaston Planté invented a rudimentary lead-acid battery1912 - Cadillac introduced the first gasoline passenger car with electric start invented by Charles Kettering1953 - Auto manufacturers started the transition from 6v to 12v 1971 - Delco-Remy Freedom Battery hits the market, the first maintenance-free lead acid battery{{:Related:_Automotive_Battery_Pages}}