2001 Ski-Doo Factory Shop Manual Volume One, Page 244Get this manual
Section 06 ELECTRICAL Subsection 04 (BATTERY)
4Allow gas bubbles to escape by lightly shaking battery by hand
CAUTION: If charging rate raises higher than 2.4 reduce it immediatelyIf cell temperature rises higher than 50C (122F) (if the casing feels hot) discontinue charging temporarily or reduce the charging rate
WARNING
Gases given off by battery being charged are highly explosiveAlways charge in well ventilated areaKeep battery away from cigarettes or open flamesAlways turn battery charger off prior to disconnecting cablesOtherwise spark will occur and battery might explode7Disconnect battery charger1 2