Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 90Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 90

CHARGINGSTARTING SYSTEM
Battery
Recommended Battery
A 12 volt battery with minimum rating of 465 marine cranking amps (MCA) or 350 cold cranking amps (CCA)For operation below 32 (0 C) rating of 1000 Marine Cranking Amps (MCA) or 775 Cold Cranking Amps (CCA) is recommended
Operating Engine Without Battery
If desired (or in an emergency), engines equipped with an electric start and alternator can be started and operated without battery (either disconnected or removed) if "WARNING", below, is followed

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