Zonqor Battery was built during the British era in 1882 (from the book listed below). It had to defened Marsaskala Bay – but some sources say the cannons were never installed in it.
Right now it is not accesible by usual means. The local farmer made it so, that you can’t really access it. The battery is listed as a Malta’s heritage site, however not much heritage may be left soon, after the site is being used for farming/hunting purposes.
The Charles Stephenson, Steve Noon: The Fortifications of Malta 1530-1945. S. 6