Wikipedia
Generally used only in the terms of naval warfare, the main battery is the primary weapon around which a ship was designed. " Battery" is in itself a common term in the military science of artillery.
Usage examples of "main battery".
Nevertheless, with his usual engineer's caution, Morgan observed that oxygen stood at 102 percent, main battery power at 101 percent, booster battery at 105 percent.
Staenbridge called out, as he cantered toward the center of the line, where the standards of the 5th Descott and the 1st Residence Life Guards flew together, beside the main battery.
All of the main battery of guns are in the citadel, an armored box within the ship.
There has to be a backup battery inside to hold whatever is programmed in DRAM whenever the main battery is disconnected.
Golem-Two had no time to relay its main battery, and, unlike either Golem, Nike had known exactly where to look for her enemies.
At the top was the main battery, six huge guns pointing through the embrasures.
Then he saw the bolt that lanced out from the Banks's main battery.