HP L70822-001 power cable is a replacement service part for the Chromebook x360 12b. The service guide identifies this exact part number as the power cable used in that computer. It is an internal component, rather than the external cord that connects an adapter to a wall outlet.
The cable connects to the system board and sits in retention clips built into the keyboard/top cover. It is intended for replacing this cable during service of the Chromebook x360 12b. The guide describes removing the cable from the system board and reversing the procedure to install it. This gives repairers a specific part reference for the computer’s internal power-cable assembly.