Battleship stock weapons need a MAJOR MAJOR upgrade. Right now, if you use only the stock weapons, you can kill another battleship in, oh, an hour, maybe. But you're already dead after 15 seconds.
I think that the Battleship Energy weapons need to be WAAAAAAAAAAY upgraded. *THOSE* should be the ones that do the massive damage... Possibly the mortars as well...
A range of 4-5k and damage of 3000-7000 hull. The speed would have to be reduced slightly. However, this would make battleships much more "RP" being as how there is no "Rheinland" Inferno or "Liberty" Battle Razor or "Kusari" Mortar... Though, without those, fights take years...
Along with this, missile turrets need an upgrade, not in damage, but in turning ability. Can't hit a Unioner unless he's flying right at ya. Even then you're better off using Battle Razors.
Yes, the shield an hull should be very close. This is most likely NOT going to hit fighters, unless their really bad, so missile turrets are still needed. The damage is similar so as to be able to get the shield down in a decent amount of time, and keep it off.
Of course, a few battleships will need a upgrade in their hull strength... (Namely BH Battleship, Battlestars...)