[Spaceships] Battery Types

[Stormcrow]

Game-mechanically, the only differences between major, medium, secondary, and tertiary weapons batteries seem to be the power (and shots) of the weapon and the number of turrets in the battery. The major battery is described as “powerful,” and the others are “less powerful.”

So when designing spaceships with the system, is there a reason to choose one kind of battery over another? I am especially interested in understanding how people choose battery types when modeling fictional spacecraft, or when converting spacecraft from standard GURPS vehicle descriptions.

I read Quadrone’s conversion of ships from Tales of the Solar Patrol, and I am confused on this point.