Considering that Apple still sells batteries for 12- and 14-inch iBooks, I think we're safe. (I say "we" because I own a uMB, too.) Of course, the uMB was around for a lot less time than the iBooks, but I still think we're good.
But, no, poster #2, they (as you may or may not have realized by the time you typed your last sentence) are not the same as the white ones.