It's been mentioned to me that some people seem to be misunderstanding point limits. The rules say:

"Battleships may not comprise more than 20% of your warships, by points.
Capital Ships may not comprise more than 50% of your warships, by points."

This means that, for a 1,000 point levy, you are capped to two Battleships. Battleships are 100 points each, meaning 2 are 200 points. 200 points is 20% of 1,000 points.

These limits are done on point value, not total number of ships value. It does not mean you can have 2 Battleships for every 10 ships you have, it means you can have 1 Battleship for every 500 points in your Naval Levy.