1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Repair Manual, P/N 507265, Page 355Get this manual
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Handling LeadAcid Batteries Strong ,Acid '1'-"-,!"- So Iut io (Sulfuric Acid)
Battery Gas is Explosive!
While Charging or Discharging, remember No Smoking No Flames No Sparks Never