A cavity long known in Maçanet de Cabrenys under the name cova Balló, due to its proximity to the mas Balló. It seems that around the decade of the 1920's it was explored by a very popular character called Pata and from this comes one of the synonyms by which the cavity is known. The first speleological exploration was carried out in 1947 by four members of the Agrupació Excursionista Pedraforca (Barcelona). In January 1957 it was explored again by local cavers, according to a brief note that appeared in the magazine Cordada. The CE Empordanès (Figueres) explored and surveyed it on 7 and 14 November 1971. As the CEE reported at the time, a group from Mataró had painted the name “Avenc de la 7” at the entrance. Toponymy: The name Batlló with which it has been subsequently catalogued is not correct, since the name of the clot, as well as that of the farmhouse, is Balló. In the only known work on the cavity presented by S. Delclós Suñer at the 2º Simposium de Metodologia Espeleológica (1972) he cites it correctly.