2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 456Get this manual
Section 08 ELECTRICAL Subsection 04 (BATTERY)
Charging Very Flat or Completely Discharged Battery
Skandic LT 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 rateNOTE: Some chargers have polarity protection feature which prevents charging unless the charger leads are connected to the correct battery 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 circuitry 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 approximately 10 hours or more If the charging current is not up to measurable amount at the end of about 10 hours, the battery should be replaced If the charging current is measurable before the end or at the end of about 10 hours, the battery is good and charging should be completed in the normal manner as specified in Activation of new battery It is recommended that any battery recharged by this procedure be load tested prior to returning it to service