1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 334Get this manual
Handling LeadAcid Batteries If spilled or splashed on Any part of Body Wash with lots of Water Wash And contact Doctor, Fast!
clogged, pressure inside may build battery may EXPLODEBattery Gas is Explosive! While Charging or Discharging, remember No
Smoking No Flames No Sparks Never remove charger cables from battery posts it's sure way to make lots of sparks surrounded
by Battery Gas Don't check battery charge by placing metal objects across posts You're sure to make Sparks and serious Burns