It was decided to suspend work on the Baltimore battery after an expenditure of $61,500, but the New York battery was to be completed to prove the project was practical. The final payment of $50,000 was made four months after it was requested.
Charles Stoudinger, Fulton's foreman or superintendent, was able to complete and install the ship's machinery. On June 10, 1815, the vessel was given a short trial run in the harbor with Stoudinger and the Navy inspector, Captain Smith, on board. This trial revealed the need of some mechanical alterations; sails were not used, and it was found she could stem the strong tide and a fresh headwind. The vessel also was visited by the officers of French men-of-war at anchor in the harbor.
On July 4, 1815, she was given another trial. She left Fulton's works at Corlear's Hook at 9 a.m., ran out to Sandy Hook Lighthouse, bore west and returned, a total of 53 miles under steam, reaching her slip at 5:20 p.m. She was found to steer "like a pilot boat." This prolonged trial revealed that the stokehold was not sufficiently ventilated and more deck openings were required. The windsails used in existing hatches were inadequate. The paddle wheel was too low and had to be raised 18 inches, and there were still some desirable modifications to be made in the machinery.
On September 11, 1815, she was again given a trial run. All alterations had been made, including the addition of hatches and raising the paddle wheel, and her battery was on board with all stores, supplies, and equipment. She had 26 long guns (32-pdr.), mounted on pivoted carriages, and now drew 10 feet 4 inches. On this day she left her slip at 8:38 a.m. and went through the Narrows into the Lower Bay, where she maneuvered around the new frigate _Java_ at anchor there. The battery then was given a thorough trial under steam and sail and, with the ship underway, her guns were fired to see if concussion would damage the machinery. The vessel was found to be a practical one, capable of meeting the government's requirements in all respects; her speed was 5-1/2 knots. However, the stokehold temperature had reached 116° Fahrenheit! She returned to her slip at 7:00 p.m.
On December 28, 1815, the Committee in a written report to the Secretary of the Navy,[5] gave a description of the vessel and praised her performance. At this time a set of plans was made by "Mr. Morgan," of whom no other reference has appeared, and sent to the Navy Department. These cannot now be found. The Committee recommended the battery be commissioned and used for training purposes. This suggestion was not followed.