If you are reading this review, you are a battleship buff and would enjoy this book.
Describes in detail how designers are forced to trade off not only the major qualities of speed, firepower and protection, but also the minor qualities of livability vs internal subdivision, roll rate vs stability, multi-gun turrets vs vulnerability to single hits, and a hundred others. No choice is free; every selection means less of something else. He stresses the point that all these tradeoffs favor the larger ship, hence the continual growth in displacement.
This is a splendid, easy 5-star recommendation. However, if you can tolerate an unashamedly biased English perspective, then consider spending your $100 on Oscar Parkes classic "British Battleships", which is a much heftier volume for the money. Instead of Friedman's neutral and quantitive description of the limits of battleship design within a given displacement, Parkes' work covers a century of battleships in the context of contemporary naval thought and technology.