Why having a HOT SHOE adapter & BT21865 battery pack?
Having a CitiDISK HDV/HD to directly record the HD/HDV/DV footage simultaneously to the tape is an excellent idea. It eliminates the inefficient, time-consuming process to re-capture footage to the computer before editing. However, CitiDISK HD/HDV internal battery supports up to one and half hours recording time only, which is not enough for long hours recording.
Hot Shoe Adapter in combination with BT21865 answer to this need. This Hot shoe adapter fits one CitiDISK HDV or one CitiDISK HD entirely; includes with CitiDISK the whole unit is secured on top of camera's Hot shoe and with BT21865 pigged back on the Hot Shoe. The Hot Shoe fits easily with all of the camera either is professional-level or consumer-level. Especially with its lightweight, strong plastic material, to hold and to sustain the dynamic vibration in the real world, it's fully transparent to whatever your shooting style may be.
Benefits of HOT SHOE adapter
Mounted on top of camera's Hot shoe and return one Hot shoe on top
Sturdy case and lightweight
Benefits of BT21865 battery pack
Extends CitiDISK HDV or HD operating time with essentially non-stop shooting
Rechargeable Lithium battery, fixed output voltage and flash light
TEST the battery status