**** me I hope these morons are never confronted with a real bomb if that's the way they reacted to that, and if the cover does come off easily, and the product works, surely that is even easier to confirm what it is if you can see the batteries and electronics inside.
When I used to carry one of these around with me to charge my e-cigarette, I was only ever once challenged over it, at the London Eye, and that involved the security asking me to switch it on to prove it worked, asked me to similarly take a drag from the e-cig, reminded me politely not to use it in the pods and then thanking me for my co-operation and wished me a good day, took all of 30 seconds, the guy knew full well what it was, he was a professional.
There is no excuse for how this was handled, it was so far wrong if you took it to Hollywood they'd dismiss it as unrealistic, considering the number of e-cigarette users there are, an subsequently nearly every one of them carrying round a battery pack with them, they should know what these things are, not treat you like a criminal because you have long hair (just guessing based on the photo) and are young.
Seriously, get Varney involved, contuary to popular belief I'm sure he'd be really interested to hear how one of his beloved passholders was threatened with having their property confiscated (aka stolen) by a balshy rent-a-cop because he thought it was a bomb (probably wanted it for himself, needed something to charge his knackered iPhone), at the very least he can go through security himself with a battery box and see how he is treated for comparison because they won't have a clue who he is.