cracked open

I heard bad things about the battery of MacBook Pro, but I can't imagine it can be this bad... yesterday I found out that the battery case suddenly cracked open!! Not to mention the computer dies down all of a sudden while the battery is still 94% full... Searching on Apple's website, it seems like a lot of people are having the same problem around this time...

Good though their customer service is pretty good, since they'll send me a new battery for free--hopefully it's not one of those from the same problematic batch...