1989 Johnson/Evinrude "CE" 60 Thru 70 Models Service Repair Manual P/N 507756, Page 221Get this manual
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8attery Charging 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 availabIe00 NOT boost