Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 108Get this manual
BATTERY DescriptionThe dry charge (without electrolyte) battery used with the 7585 H.Poutboard motor should have rating of 70 amp hours minimumBefore putting new dry charge battery in service it must be activated
Electrolyte is made up of sulfuric acid and pure waterApproximately 35 percent by weight or 24 percent by volume is acid
Always store batteries and acid in dry area at 60 to 90 F
Never add pure sulfuric acid to battery
WARNING
Activation Procedure
Slow ChargeSlow charging is the preferred method of charging batteryThe slow charge method may be safely used, regardless of charge condition of the battery, provided the electrolyte is at the proper level in all cells and is not frozen