Battles: Less proggy, more cuddly. (Photo by Jason Frank Rothenberg)

(Courtesy of Warp Records)

Restless and engaging and smart, “Gloss Drop” feels like less of a math-rock exercise than the band’s much-loved 2007 full-length debut, “Mirrored,” and more human, as if it were following some unspoken, post-Braxton mandate: less proggy, more cuddly.