2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 116Get this manual
CHECKING THE BATTERY
Batteries generate explosive hydrogen gasAlways follow these preventive measures: Charge batteries in well-ventilated areaG Keep batteries away from fire, sparks or open flames (e.g welding equipment, lighted cigarettes, etc NOT SMOKE when charging or DO handling batteriesKEEP BATTERIES AND ELECTROLYTE OUT OF REACH OF CHILDREN1.Remove: Seat Battery holding bracket Battery lead cover Refer to "SEAT, CARRIERS, FENDERS AND FUEL TANK"