From the record
“Battery No. 1 is a historic artillery battery located at James Island, Charleston, South Carolina. It was built in 1863, as part of the James Island Siege Line.”
Wikipedia article Battery No. 1, CC BY-SA 4.0.
One of 227 National Register listings published here for Charleston County · listed in 1982 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service