That latter component takes the place of the RAZR's battery cover (as pictured after the break), with a tiny arm that plugs into the phone's mini USB port.
It also supports 1080p HD video and 3D through HDMI, comes with a mini USB port, and micro-SD card slot for up to 32GB for additional storage of favorite games, movies, photos, and documents.
On the back, two more doors flip open to expose a mini-USB port for charging (still no micro) and a mini-HDMI socket to get a direct, digital feed of content.