I stopped using battery straps and went to plain old Walmart Velcro on a roll. Between that and Ummagrip It takes a MAJOR break carbon level crash to eject a battery. I just make sure that I file and fine sand the carbon edges where the Velcro folds around and that the fuzzy side makes the contact so there is some cushion and not direct contact.
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then again on days like that one you just need to know its time to stop flying and go to the local ballet for a few pops and let the dancing gurls make you forget your troubles.