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I can tell you, I went through three batteries on our 39 Merc before finding One good battery. You have to check them with a Hydrometer, NOT a volt meter, three batteries tested OVER 6 volts but ALL three had a dead cell!!!! WHEN this occurs, you have NO cold cranking amps!!!SO get a hydrometer and check the cells before you buy the battery!!!!! Also pull the caps off and make sure the electrolyte level is up to snuff JMO and FYI