You did ask what seemingly was a very remedial question on April 1st of all days. For even the seasoned amateur photographer, most would/should know that the 1D series have ALWAYS come with an integrated vertical grip. So to ask about an additional battery grip, well, did seem like a trick question.
It's synonymous to asking if a DSLR comes with a mirror.
There's certainly nothing wrong in asking... but don't expect the world to coddle you with their response.
I'd chalk this up as another Lightrules moment.
If you do go through with the purchase, congrats to you. It's a fun camera.