To secure my battery.. I have it located under the wing... have triangle stock running widthwise...battery wrapped in foam, have eye screws ca'd into the triangle stock and a #64 doubled up holding it all down. Seems snug but not to tight either allowing foam to dampen vibration... I shook the fuse around and it stays put.. any other ideas on how to do this. The batt did not need to go under the tank for balancing so this was what i came up with.
Mike

I usually just wedge mine in with foam or if that is not an option I wrap it in the thin shipping foam, then wrap that with clear packing tape and glue it in the desired location with shoe goo.
The rubber band will last a reasonably long time but when it changes from good to bad it will happen very quickly, so check it often.

I use braces (3/8" X 3/8") epoxied on the inside of the fuselage and then a thin (1/8") sheet of plywood above it. I cut some holes in the plywood for heat dissapation. I screw the plywood into the braces with small wood screws. Then I remove the screws, CA the holes and allow the CA to dry (this hardens the threads on the holes). I wrap the battery in foam and place it between the top or bottom of the fuselage and replace the plywood cover. Works great and I have easy access to the battery (simply remove the wood screws and the plywood cover).