The battery along with 2 six in gun emplacements and observation posts was re-utilised during World War II to defend the approaches to Botany Bay. During WWII, it was armed with two 18-pounder Mk IV field guns and two QF 3 pounder Hotchkiss guns. The underground bunker and tunnel complex consisted of vaulted ammunition storage rooms with double walls and ceilings. The doubling up of walls and ceilings was a preventative measure meant to stop the walls from collapsing in the event of a direct hit. The battery is currently not in use.