Each of the battery-trays is inlaid with a strip of Velcro, in an exercise of medieval marquetry the master-builders of Notre Dame would have been proud of.
It does mean the question of which side of the Velcro to use raises its ugly head, although therapists agree that ~ like the way you drape a toilet roll ~ you needn't read too much into it.
I've always been a draw-it-over-the-top man when it comes to toilet-roll (at risk of sounding like Alan Partridge), for then each square* puts itself out there loud and proud.
Accordingly I've gone for a conventional hook-and-drone methodology, leaving the battery-pack snug as a bug with the wooly side; again a product of experience, my once having taken a quarter-hour to remove one from a trouser-pocket.
Velcro was invented in the 1940s by a Swiss guy out hunting with his dog, intrigued by the way its jaws were seemingly clamped around a passer-by's crotch.
Ed. Technically a rectangle, so lay off the keyboard*
