What is wrong with my four wheeler?

i have a kawasaki 220 bayou and it hasent been rode since last year and i went out the other day and charged the battery and when the battery was done charging i tried to start the four wheeler and when i tried to start it it would crank and fire but woudlnt start and now when i go out there to start it it dont crank it just makes some kind of clicking noise beside of the battery.. CAN SOMEONE HELP ME!!