1990 Johnson Evinrude "ES" 9.9 thru 30 Service Repair Manual, P/N 507871, Page 280Get this manual
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8attery Chargi ng 800st charge 12-volt batteries at 50 amperes for 20 minutes (1000 minutes)If the charger will not give this rate, charge for equal number of minutes at best rate availabIeNOT boost b