Marine Battery Question

[antgogz]

So I have had a die hard marine battery for about 8 years. It has worked EXCELLENT. I have a die hard automatic charger and usually charge it after I use it. Then it would sit in my parents garage for the whole winter and I would charge it every once in a while during the winter. I always charge it on slow. However, stupid me left the battery in an outdoor closet in my condo. I was done with it in the fall and left it there all winter and forgot it was there with how busy I have been. I noticed a little bit of dried up acid towards one of the metal screws on the top. Is it safe to try to recharge it? Or do you guys think it's finished???