The second Battle outside northern Öland was a sea battle fought during the Northern Seven Years' War between Sweden against Denmark and the Free City of Lübeck, on 14 August 1564. Sweden who suffered one ship (Elefanten) won the battle over the allies whom suffered three captured ships (Böse Lejonet, Morian, David).
Sources
Unger, Gunnar (1909). Illustrerad svensk sjökrigshistoria: afsedd för undervisningen vid k. sjökrigsskolan. D. 1, Omfattande tiden intill 1680 (in Swedish). Stockholm: Bonnier. SELIBR648419.
Glete, Jan (2010). Swedish naval administration, 1521-1721: resource flows and organisational capabilities. The northern world, 1569-1462; 46. Leiden: Brill. p. 153. ISBN9789004179165. SELIBR11656061.