If it were me I'd still use it. But I'm reckless like that.
I mean, if it's not leaking and it's operating well.. it should be fine.
But, if there is any doubt in your mind about the safety of that battery, please just don't use it. This is a judgement call on your end.. Unless you show us pictures of the battery itself we have no way of knowing the extent of the damage done. In the end I would say that if it makes you uneasy, set it aside and use a new one.