HAH! Happened to me all the time. Every single time i did a loop with my old TT something would fly off most of the time it was the prop but I ejected the battery and tore off the wing a few times too.
Been there. The woods have eaten batteries from my Tiny Trainer and Scout. So hard to find those batteries in the tall grass. Plus the effect on the CG and loss of all thrust and control results in a nearby and thankfully soft landing. I've also had some batteries fall loose from the velcro and dangle below the plane until I can bring them around and land them. I haven't had the problem since looping a rubber band around the skewers and across the batteries.
And, I've had wings fold/break, usually at the root, on my original Tiny Trainer and all 3 of the Mini-Scouts I've built. Even the most recent one where I glued a (thin) skewer across the wing. Now I glue a thicker skewer in front of the spars on all my builds.
First Mini-Scout. 3-channel.
Second Mini-Scout. 4 channel. Made each wing 1" longer because of the servos. Skewers underneath but they joined in the middle and the wing still folded so I added the Popsicle stick on top. Fantastic flyer both fast and slow.
This skewer was continuous through the wing but it snapped. Added a thicker skewer parallel and a top popsicle stick. Note the strapping tape which didn't seem to add any breakage resistance.
Original 4-channel Tiny Trainer. Wing has folded twice. Popsicle stick spar-reinforcers do the trick and it still (barely) flies despite all the weight. Note the piece of foam in the center-wing uses the rubber bands to press down and keep that traditional fold from allowing the wing to tip up in the back.