The Bescor CLC-125 Cigarette Adapter for LED-125 Camera Light powers the Bescor Morning Star LED-125 Camera Light by connecting it to a Bescor battery pack.
One end of the CLC adapter is a 12V barrel connector that plugs into a 12V input port on the LED light. The other end is a cigarette plug that connects into one of three Bescor 12V battery packs -- the HP3, MM7, or NMH54.
The moment the CLC adapter connects the LED light to a battery pack, the LED light stops using the power of any AA batteries that may at the same time be in it. So the AA batteries don't need to be removed in order to be preserved when switching to a battery pack.
The battery packs are carry-on or waist-belt packs, and the CLC adapter is six feet long, so comfort exists when maintaining a connection between a battery pack and the LED light.