The hp pavilion dv7 battery is a small neighbourhood within the city of St. John's, Newfoundland and Labrador.The hp pavilion dv7 battery sits on the entrance to the harbour located on the slopes of Signal Hill. Sometimes described as an outport within the city of St. John's. The area is noted for its steep slopes, colourful houses, and its importance as a battery for the defence of St. John's Harbour in both World Wars.

The Battery is home to Chain Rock, a land outcropping to which a large chain and anti-submarine boom were attached connecting to Fort Amherst in order to prevent the entry of German U-boats into the harbour during World War II. Chain Rock is one of two rocks located on opposite sides of the Narrows, Chain Rock on the battery side and Pancake Rock on the opposite. The space between the two rocks is 174 meters. Chain Rock and Pancake Rock were used as early as 1770. A chain was stretched between both rocks by means of a capstan at nightfall to prevent illegal entry of enemy ships. During World War I the chain was replaced with anti-submarine nets.

Another historic property in the area is Anderson House located at 42 Powers Court in the hp pavilion dv7 battery as it is believed to be the oldest structure in the city of St. John's.
U-boat is the anglicized version of the German word U-Boot  ( listen), itself an abbreviation of "Unterseeboot," (meaning in English, "undersea boat"),and refers to military submarines operated by Germany, particularly in World War I and World War II. Although at times they were efficient fleet weapons against enemy naval warships, they were most effectively used in an economic warfare role (commerce raiding), enforcing a naval blockade against enemy shipping. The primary targets of the U-boat campaigns in both wars were the merchant convoys bringing supplies from Canada, the British Empire and the United States to the islands of Great Britain and (during the World War II) to the Soviet Rechargeable hp dv7 battery Union and the Allied Countries in the Mediterrenean. Austrian submarines of World War I (that is, before the country lost its coastline after the war) were also known as U-boats.

The distinction between U-boat and submarine is common in several languages, including English (where U-boat refers exclusively to the German vessels of the World Wars) but is unknown in German, in which the term U-Boot refers to any submarine.