Battroble is based on the Pygmy Pipistrelle like its pre-evolution but also on the Flying Fox, it has a much longer body than its pre-evolution and more developed limbs with larger wings allowing it to take flight properly and relatively long and muscular legs allowing it to perch bipedal and also pick up prey with its large claw-like toes. Its wings have stripes that interval with the black skin of the Pokémon, these stripes are grey and orange in colour, like its pre-evolution it also has stripes on its ears however like the stripes on its wings these are orange and grey. Its back has a thicker coat of fur than its underbelly making the Pokémon appear larger than its really is.
It has also grown a collar of fur around its neck, this collar appears similar to that of a Foxtail Scarf with what appear to be the longest pieces of the collar at the front curling down and away from the center of the body. Its head has a longer snout and it has a few fangs protruding from its mouth unlike its pre-evolution. Its eyes are also larger and appear more coloured with bright red irises and a black pupil for each eye, its eyes have a circular shape to them much like its pre-evolution.