For those who want to discuss further about the price of Cruiser units (even customized ones) and Battleship.
Now, with a lower cost I can also explain why I use CL as an abreviation for cruiser.
And with the stats maths evaluation bringing up by KionAAA, I can put other cruiser in a better place of scaled cost.
There is more room for other historical units for those who use more miniatures like HBG.
Light Cruiser, CL A3D3M2C10, 1 hit, shore bombardment 1@3 Definitely balance.
Battle Cruiser, CB A4D4M2C12, 1 hit, shore bombardment 1@4
It is the price to have a competitive unit but weaker vs CL or BB.
Armored/Heavy Cruiser, CA A3D3M2C16, 2 hits, shore bombardment 1@3
It need to be at 16 IPCs to be balance, lower too OP vs BB or CL.
Battleship, BB A4D4M2**C18**, 2 hits, shore bombardment 1@4
After more cost eval and battle calc, I must say that BB have to be at 19 IPCs to be statistically balance with cruiser at 10 IPCs and Carrier at 16 IPCs.
It will also give more room (3 IPCs) vs heavy cruiser A3D3 with 2 hits.
To get more differences between cruiser vs BB:
A) Give all types of cruiser M3
B1) Give them 1 preemptive AA@1 on defense when paired with 1BB or 1CV
B2) Give them 2 preemptives AA@1 on defense when paired with 1BB and 1CV
B3) Give to 1 cruiser 1 preemptive AA@1 on defense.
C) Give 1 cruiser both offence and defense on a roll of “1” on first round only, to hit 1 plane (owner choose the type of casualty Fgt, TB, StB).
D1) Give to CA a coastal bombardment @4 instead of only @3.
D2) Give to the BB 2 rounds of coastal bombardment @4 when there is at least 1 ground unit remaining from TT making the amphibious assault after first round.
E) Give to the BB 1D3 damage to either IC, Naval Base or Air Base as a coastal rocket attack.
F) Give to BB Plundging Fire on first rnd: 1@1 preemptive strike against surface vessels
G) Forbid BB to attack subs: A0 vs Subs. But play them on defense vs subs D4 as OOB rules.
H) Having a BB Flagship, with 3 hits (21-22 IPCs vs 18 / 23-24 vs OOB 20).
With all this options, Cruisers and BBs will be bought and use for very different function.
Of course, putting all of it can unbalance toward other naval units: but nevertheless DD and Subs have their own proper function.
But all this optional addition can add some historical flavor, and a real gameplay difference amongst the bigger warships.
And you can even gives different options to Light, Battle and Heavy cruiser unit to create a more representative difference amongst them.
For example:
give M3 and AA to Light Cruiser,
just M3 to Battlecruiser,
M2 and Coastal @4 to heavycruiser but forbid Subs attack like BB option.
Someone can rise the BB cost to 19 IPCs or even 20 but giving them plundging fire and 2 rounds of coastal @4, because of the longer range of their heavier guns.