2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 139Get this manual
CHECKING AND CHARGING THE BATTERY CHK ADJ
TIP: 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 terminals
1Remove: battery cover 1