Thanks for specifying. If the battery benchmark can be run on your device, the option should show up on the command line.
On Windows, If you haven't already, you can install the Command Prompt Tool by opening Geekbench 4, and clicking Tools (on the main menu at the top of the window) > Install Command Prompt Tool. This will add the tool to your PATH.
To use the command line, open Command Prompt and run geekbench4 --help. This will show you the help menu, and if the battery benchmark is available it will show up on the list. Let me know if you have any questions about this.