Yep. This is old news. But more recently other companies have also decided to implement on-board batteries on their custom servers, most notably Facebook:
http://www.datacenterknowledge.com/archives/2009/11/27/shoul...
And yes, this story was real, despite the April 1 date. I attended the event, and saw the server. It definitely seemed odd to schedule a technology unveiling on April 1, but Google apparently launched Gmail on April 1 as well.