1995 Johnson Evinrude "EO" 90 CV 85 thru 115 Service Manual, P/N 503150, Page 232Get this manual
Battery Specifications
[!] For each motor provide one battery that is:
12-volt, heavy-duty, designated "marine" Ventedrefillable or maintenance-free Rated 360 CCA (465 MCA) with 90 minutes reserve (50 amp-hrs) Deep-cycle batteries are suitable IF they meet or exceed the minimum CCA requirementsInstalling and Connecting Batteries and Cables Place the battery so it is easily accessible for frequent checking and recharging and in hold-down systemInstall positive cable to positive post and negative cable to negative post
f21 When
'-=J surface star washer over the threaded battery post, then
connecting to the battery, begin by placing large-
stack cables from accessories, then cables from the motorFinish the connection with hex nut, tightened firmly with wrenchDO NOT use wing nuts on battery connections even if they were supplied with the batteryWing nuts can loosen and cause errant warning horn signals or electrical system damageApply OMC Triple-Guard grease to connections