1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 307Get this manual
Battery Specifications All batteries should be of heavy duty, marine construction The battery must be ventedrefillable type9.9 thru 30 For best performance, we recommend 12-volt battery with inimum rating of 350 amps cold cranking at (- 18 C) and 100 minutes reserve capacity at 80F (2rC)Battery Testing Battery electrolyte is an acidic solution and should be handled with care If electrolyte contacts any part of the body, immediately flush the exposed area with liberal amounts of water and seek medical aid as soon as possible