1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 455Get this manual
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Handling Leadl Acid Batteries
'3l Always charge
in .a well ,-:entilated areaCharging causes aCid solution to give off hydrogen gas through the vents in the _Make sure vents are open