Adjustable Ring/Band clip to fit around DAV or Zeus & attach to a Lanyard.
Could have Vapor4Life logo on it as well as different colored lanyards with logo.
I think with the DAV & Zeus batts a Lanyard is a Necessary Accessory.
Stay with 808 threading.
Maybe offer replacement tank cartomizers in optional 510 that fit the Vapor4Life tanks.
I love my DAV's but I would like to see a VV/VW Mod with 808 threading.
But if the tank cartomizers could be swapped out with 510 it would make things easier for using the tanks with other batts/mods.