Did the same thing doing tight snaprolls with a shocky. I made a strap from 1 in. wide tape stuch together sticky side to sticky side so you end up with a plastic strip about a foot long. Slit the wing twice about the width of the batt. Feed it through the wing and back up the other slit. put velcro on both ends afrer cutting it to length. Havn't lost a batt. since. Still have just as many prangs though.