2004 Skidoo Tundra Skandic Series Service Manual, Page 314Get this manual
Section 06 ELECTRICAL Subsection 04 (BATTERY)
4Allow gas bubbles to escape by lightly shaking battery by hand
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
A17E0HA
5Readjust the electrolyte level to the UPPER LEVEL line-