650 meters in length seems much more plausible than the 225 meters listed in other official sources. Stargate was never a show that had consistency in the details.
I just saw the other post and that seemed more what I would expect. I'm alittle conflicted. I've sort of imagined the battle ships to be like giant flying battle ships. 650 meters would put it past the longest battleship the u.s. has by a large margin. The show really did not have consistently.