Greenfield Mills ruins in Greenfield Valley. The Battery Works at Greenfield Mill, near Holywell, was established in 1776. Local people were employed to shape pots and pans from brass sheets held beneath heavy tilt hammers. | Next to the Battery Factory is the ruins of Battery Row, were many of the employees would have lived.| The Battery Factory now lies next to the Battery Pond in ruin, the site is now supported by the 'National Welsh Heritage Lottery Fund'.