Do as i have done and get AE's thumbscrews etc.. but use this in conjuction with Kyoshos carbon battery brace for the RB5..
I use LRPs 5300 28c/40c stick lipo, with the sticker side up (locaters underneath) and this works just fine
I put the carbon battery brace in the slot just above the "kit" slot and once battery brace tightened up, they are going no where
If you want a pic let me know..
Cheers
Nick