The top speed of a large battleship can vary depending on its design, size, and propulsion system. Historically, battleships of the 20th century, particularly those from World War I and World War II eras, had different maximum speeds.
During World War I, battleships typically had speeds ranging from 20 to 25 knots (23 to 29 miles per hour or 37 to 46 kilometers per hour). For example, the British HMS Dreadnought, launched in 1906, had a top speed of approximately 21 knots (24 miles per hour or 39 kilometers per hour).
By the time of World War II, battleships had become larger and more powerful. The speed of battleships during this era increased, and they could achieve speeds of around 28 to 30 knots (32 to 34 miles per hour or 52 to 55 kilometers per hour). An example is the American USS Iowa-class battleships, which had a top speed of approximately 33 knots (38 miles per hour or 61 kilometers per hour).
It's important to note that the speed of battleships was limited by factors such as their size, displacement, and propulsion systems. Battleships were massive and heavily armored, which affected their speed and maneuverability. Additionally, advancements in naval technology, such as the development of aircraft carriers and long-range naval aviation, rendered battleships less dominant in naval warfare, shifting the focus to faster and more agile vessels.