1987-2009 Yamaha ATV YFM350X Warrior Raptor Service Manual, Page 387Get this manual
CHECKING AND CHARGING THE BATTERY CHK ADJ
NOTE: Since MF batteries are sealed, it is not possible to check the charge state of the battery by measuring the specific gravity of the electrolyteTherefore, the charge of the battery has to be checked by measuring the voltage at the battery terminals1Remove: seat Refer to "SEAT, SIDE COVERS, AND FRONT PANEL"2Disconnect: battery leads (from the battery terminals) CAUTION:
First, disconnect the negative battery lead 1, and then the positive battery lead 23Remove: battery holding bracket Refer to "REAR FENDER"4Remove: battery 5Check: battery charge
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
aConnect pocket tester to the battery terminalsOpen-circuit voltage (V) Relationship between the open-circuit voltage and the charging time at 20 (68 F)