what was her role during the british service?
It was used as a gunnery target.
SMS Baden
After the inspection was concluded, it was determined to expend "Baden" as a gunnery target. In January 1921 the first round of gunnery tests was ordered. 
what is sms baden? It was a dreadnought battleship. who or what was responsible for its design? The Germans. what was its service history? It was ordered under the provisional name "Ersatz Wörth" in 1912, the ship was laid down on 20 December 1913 and launched on 30 October 1915. in which sea was it laid down? UNANSWERABLE which mutiny was it a part of? The mutiny on the night of 29 October 1918. what are some battles this ship has been used for? It saw little action during her short career. why did she had a short career? Launched in October 1915 and completed in March 1917 by the Germans who handed it over to the British in 1919.
wiki:5031755
SMS Baden [SEP] British service
After the inspection was concluded, it was determined to expend "Baden" as a gunnery target. In January 1921 the first round of gunnery tests was ordered. The gunners at HMS "Excellent" fired the new armor-piercing (AP) shells that had been introduced after the Battle of Jutland. This round of tests was used to determine the most efficient ratio of explosives in the detonator caps; the shells fired at Jutland had a tendency to fragment when striking heavy armor rather than penetrate. The monitor moored some away from "Baden" to fire her guns from point-blank range. "Baden" was made to list to starboard by the removal of coal and armor from the port side, to simulate the effect of a shell striking armor from a plunging angle.