How much current can I draw at maximum from a 6V lantern battery?

I’m thinking about using a battery such as this: http://www.radioshack.com/product/index.jsp?productId=2103180&clickid=prod_cs#

Not exactly that one but you get the idea. Anyway, I was wondering if I could get 2A of current out of that battery, or if you think that would exceed its maximum current output. Any help you may provide would be greatly appreciated!