A battery cover is disclosed. The battery cover has a lower battery cover and an upper battery cover. The upper battery cover is matable with the lower battery cover to form a labyrinth and a plurality of battery cover sides. The labyrinth has a plurality of labyrinth cell passageways between a plurality of cell openings and a plurality of mixing areas, and the labyrinth cell passageways extend above an acid level when tipped all directions onto the battery cover sides from an upright orientation.