1996 Ski-Doo Shop Manual, Volume 1, Page 240Get this manual
Se ion ELECT RI CAL Sub-Section 04 (BATTERY)
Charging Very Flat or Completely Discharged Battery :
Unless this procedure is properly followed, good battery may be needlessly replaced Measure the voltage at the battery posts with an accurate voltmeterIf it is below 10 volts, the battery will accept current at very low rate in term of milliamperes, because electrolyte is nearly pure water as explained aboveIt could be some time before the charging rate increasesSuch low current flow may not be detectable on some charger ammeters and the battery will seem not to accept any charge Only for this particular case, set the charger to high rateNOTESome chargers have polarity protection feature which prevents charging unless the charger leads are connected to the correct batte terminalsA completely discharged battery may not have enough voltage to activate this circuitry, even though the leads are connected properlyThis will make it appear that the battery will not accept chargeFollow the charger manufacturer's instruction telling how to bypass or override this circuitty so that the charger will turn on and charge low-voltage battery Since the battery chargers vary in the amount of voltage and current they provide, the time required for the battery to accept measurable charger current might be up to approximatively 10 hours or more