Let's be open to this, when one is in the market for a drone, I'm guessing that battery placement is not high on the list of considerations, I imagine that high on the list is Flight Time (Time flying on one battery), Range (how far out can the drone be controlled safety), Cameral Quality (number of megapixels, shutter speed, ISO, JPG/RAW, etc…), Video Quality (2.7K, 4K, 5.2K by 30 and 60 FPS, etc…), Size (wind bucking ability, etc…), Brand Name Support (warranty, repair, technical support, etc…)… and more…
Now, admittedly, one who has had a loose battery issue, than it gets more consideration…
My suggestion of the Velcro Wrap was only for the folks who are "caught out on the cold" with batteries that might become dislodged during flight. The Velcro adds almost no perceivable weight and can be wrapped so tightly that one could actually crush the drone…