1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 63Get this manual
good after boosting, it should fuHy recharged before returning it to serviceIf of the to 1.95 volts after the first boost charge, the battery should given second boostBatteries which do not after second boost charge should replacedCHARGING Boost charge 12-volt batteries at 50 amperes for 20 minutes (1000 ampere minutes)If the charger will not give this rate, charge for an equal number of ampere minutes at best rate availableDO NOT boost battery more than this amount for the "light load test"If batteries are to
If the battery is found to
gravity of the battery electrolyte should checked with battery hydrometer, preferably one that has built-in thermometer and correction chartNo other method should used to determine the charge condition of batteryNote that hydrometer reading is not accurate if water has been recently added, due to the fact that the water has not had chance to mix with the electrolyteThe proper water level should maintained at timesIf water is added in freezing weather, the battery should charged to full charge at onceOnly pure distilled water or water approved for battery should added to the battery to replace water lost through evaporationNever add acid cept when has been lost spil1ingFor mounting the battery, frame securely fastened to the boatloose battery shift in the boat, damaging itself or other equipment Tighten hold-down nuts evenly until battery is secureIf hold- down nuts are too tight, distortion and damage to battery will result