1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 264Get this manual
Battery Specifications INotel All batteries should be of heavy duty, marine constructionThe battery must be vented, refillable type
60 thru 75 For best performance, OMC recommends 12-volt battery with minimum rating of 360 amps cold cranking at 00 (-18 C) and 115 minutes reserve capacity rating at 80 (2JO C)