Final answer:
Radar was the new technology that aided Britain during the Battle of Britain.
Step-by-step explanation:
The new technology that aided Britain during the Battle of Britain was radar. Radar, which had been used effectively to intercept German planes over Great Britain in 1940, was now used in planes to detect German U-Boats on the surface of the Atlantic.
The Battle of Britain was a pivotal air campaign fought between the British Royal Air Force (RAF) and the German Luftwaffe during World War II. The battle took place from July 10 to October 31, 1940, and it was a critical confrontation in the larger context of the early stages of the war.