What are the Klingon Vessels in the Battle of the Binary Stars?

Question

In the Star Trek Discover S1:E2 episode Battle of the Binary Stars, we see a number Klingon Vessels. These are referred to as Klingon D7s.

In discovery, they look like this:

My understanding was that the Klingon D7 looked like this:

My question is: What are the Klingon Vessels in the Battle of the Binary Stars?

Answer 1

Interestingly enough they're actually referred to as 'Klingon Vessels' throughout this episode.