1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Manual, Page 235Get this manual
3Capacity Test Satisfactory capacity tests can be made only when the battery electrolyte equals or exceeds 1.225 specific gravity at 80F (27C)4Terminal Voltage Test
ill procedures
Use extreme caution during any load testingImproper could overheat battery and cause electrolyte gassingYou might create an explosiveatmosphereaVariable Load High Rate Discharge Tester (Recommended)