The item is a new extended battery for the PSP from Blue Raven
Technology, promising 8 to 15 hours of extra power. The exact
amount of time is influenced by what type of game is being played or what other kind of PSP functions are being used.
The selling point, however, is the design. The battery comes as part of a rubberized, five-ounce half-shell that the PSP slips into easily, leaving the back of the device encased in a manner that offers a comfortable, balanced grip. It was a bit of a squeeze, but the enlarged PSP still fit into the zippered protective case I use (and which I would have been annoyed to give up).
Now, some quibbles: There’s just a single sheet of instructions for the battery, and that’s just a clumsily written installation guide.