It is impossible to answer the question of how many hits it takes to sink a battleship with a definite number. This is because the size, design and materials used to build a battleship are all factors that determine the number of hits it requires in order to be sunk. Generally speaking, a well-built battleship would require more hits than one which was not built as robustly. Additionally, depending on what type of ammunition is being used, this could also influence how many hits are required before sinking.