batterty discharge

well i was workin on my engine this morning and i shut the hood when i finished, i come back about 3 hours later and when i go to pop the hood it won't unlach, so i push and pull on it till it moves and when i get it open, i notced that my batter terminals were loose and when i shut the hood, it touched the two terminals and acually welded themselves to the hood, my battery doesen't work now and i'm wondring if it could have caused any other form of electrical damage? should my electrical system be fine?