- You may also be looking for the Jem'Hadar battle cruiser, which was also described as a "Jem'Hadar battleship."
On stardate 51825, the Federation starship USS Valiant conducted a mission to collect technical data on a new battleship operating in their sector. After spending three hours collecting data on the vessel, they determined that it was "a direct threat to every Federation outpost and colony within fifty light years" and that it "must be destroyed." Believing they found a weakness in the design of the ship, they engaged the Jem'Hadar vessel and were subsequently destroyed with relative ease by the battleship. (DS9: "Valiant")
Several of these ships participated in the Battle of Cardassia. Afterwards, they and the other Dominion forces retreated to the orbit of Cardassia Prime to join the defense of that planet. (DS9: "What You Leave Behind")
The crew of the USS Valiant determined that the primary support braces for the antimatter storage system of the battleship were constructed from viterium, prone to destabilization when exposed to delta radiation. The Valiant crew attempted to exploit this possible design flaw using modified torpedoes, but discovered that the ship was not as susceptible as they thought. (DS9: "Valiant")
The Dominion battleship was designed by John Eaves. The actual size of this vessel is uncertain. Based on Jake Sisko's statement, which Nog confirmed as "accurate," the vessel is 1,284 meters long if taken literally. This is supported by the close-range engagements in "Valiant", which establish a size several times larger than that of the Defiant-class. The same approximate scale is maintained for the battleships during the Battle of Cardassia. However, in the final shot of the Dominion fleet around Cardassia, the battleship was scaled several times larger than previous. Although this was likely done to enhance the ominous effect of the fleet, it may suggest visually similar classes of varying sizes.