2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 106Get this manual
CHECKING AND CHARGING THE BATTERY
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 battery cover Refer to "SEAT, FENDERS AND FUEL TANK"
2Disconnect: battery leads (from the battery terminals)
CAUTION: