Design your own case from scratch, and then it is your design. Fact is, you made a basic battery pack mod in a pre-existing flashlight housing. That is in itself a knock off of pre-existing mods. Its cool that you had the gumption to market it, however after reviewing all of the facts and dates of pre existing battery mods your design does not warrant any kind of special treatment. I think it would be in your best interest to get creative perhaps and design your own case instead of using a pre existing flashlight case. Thats just ghetto and in poor taste to treat other people badly for stealing an idea that you yourself got from another source.
I haven't been around as long as some others, but apparently I've been around longer than you, and a quick search yields this thread, where, curiously, no one mentions a pre-existing mod to the Screwdriver:
Home-made battery