The Pentax Remote Battery Pack F Set consists of the Remote Battery Pack F and Terminal Grip F, both required to provide a reliable 4x AA battery power solution for the SF1/n and SFX/n cameras, even in extreme cold weather. The Remote Battery Pack F connects to the Terminal Grip F via its 3.3' (1 m) cable, and allows for the battery pack to be kept warm inside clothing, for better performance. The Terminal Grip F replaces the existing battery compartment door on the camera, to provide a socket for the connection cable.
