battery retainer for Sport Cub RC airplane

This is a retainer for the 1300 mah battery supplied with the Horizon Hobby/ParkZone Sport Cub. It captures the battery and the Velcro strap so that it cannot slip out from under the black Velcro strap.

I had the battery fall out of the airplane while in flight. My guess is that it slipped out from under the Velcro strap and forced open the flexible battery cover door.

It is important that the retainer captures both the battery and the Velcro strap.

I have flight tested this through har