I found some 2-sided Velcro strap at a craft store. (Just go past the Foo-Foo Chick Stuff department and take a left into the Cool Guy Stuff department.) It's not too expensive, like $4.99 for 10 feet or so. I embed a 4"-5" dowel or spruce strip lengthwise in the profile fuselage, grazing the top of the battery hole. Above the dowel, midway along its length, is a narrow slot for the Velcro strip. Then it's slide the battery in, close the Velcro loop, & let the lomcevaks begin.

Although I have to admit, the in-flight detachment looks pretty exciting on video.