As far as the frames goes, I believe that several people will need the charging cable or an extra charging cable. This is on ebay and is sold by ankerdirect.
I am posting this due to we recently had a beta tester on here and they were having issues and me and @The_Professor gave a few recommendations. Based upon the guys answer it was the charging cable. It seemed he paid like 30 dollars for it but anker direct is selling it on ebay for 13 dollars.
Either way it was a lot of money for them to pay for something they could have got for 13 dollars.
Since it was a beta pair, I am not sure if it is the same cable or a slightly different cable. Either way it is nice to know you can get them for a decent price as I thought 30 dollars was a bit steep.