It is tight and I'm not sure if mine has a normal Saturno battery tray, it has 2 fixing bolts each side, I remove the 2 front bolts, slacken the 2 rear bolts and tilt the tray down, just enough to get the battery out, my bike does not have the Saturno air box, but is fitted with more bulky twin Keihin CR carbs and foam filters
John