2007-2009 Suzuki LTZ90 factory service manual, Page 216Get this manual
ELECTRICAL SYSTEM
SERVICING
Visually inspect the surface of the battery containerIf any signs of cracking or electrolyte leakage from the sides of the battery have occurred, replace the battery with new oneIf the battery terminals are found to be coated with rust or an acidic white powdery substance, clean the battery terminals with sandpaper
RECHARGING OPERATION
Using the multi-circuit tester, check the battery voltageIf the voltage reading is 12.0 (DC) and less, recharge the battery with battery chargerA Charging period Stop charging