Notice the big silver thing that says CAP-XX on it. That would be the 'battery backup' that is in question here. I just recently got my Vertex 2 Pro drive for testing and noticed that it doesn't contain this part at all.
I asked OCZ about it and found this out. I figured it was worth sharing with our readers.
This will NOT be present on the consumer class devices Vertex2, and Vertex2 Pro. This will only be on our enterprise class Deneva product line. Basically what it's for is in event of a sudden power loss the drive will go into a mode where it will focus on completing write commands using the power in the super cap. Its only enough for a short burst, but it's enough to get the job done. This is important on SSDs more so than HDDs in enterprise. On an HDD when write caching is turned off, the last write command is lost, but the rest of your data is secure. On standard SSDs because of the nature of Flash and Flash management it is not typically possible to guarantee data integrity on sudden power loss. The enterprise class Deneva Series will be the first high performance readily available SSD that guarantees data integrity on sudden power loss. As a bonus effect the last write does in fact complete so no data is lost.