1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 336Get this manual
If batteries are to be fu"y charged by means of quick charger, the charge rate must be "tapered" (reduced to safe limit) when the electrolyte temperature reaches 125 (52 C), or when gassing becomes excessiveFailure to do so may harm the batteryIf the battery is to be slow charged, adjust electrolyte to proper level by adding water, then charge the battery at amperes until fully chargedFull charge of the battery is indicated when all cell gravities do not increase when checked at three intervals of one hour and all cells are gassing freelyPlenty of time must be allowed for slow chargingCharge periods of 24 hours or more are often required Battery Care