These are charging banks BUT they don't come with a battery. You put a battery or rechargeable in them (I'm not positive what size. Looks like maybe AA or something of a similar size) and you can charge off of them. I ordered them thinking they were actually built in batteries and don't need them.
BUT... they would be great little hidy holes for something small about the size of a battery because no one would suspect them of being anything.
(They do feel unnaturally light for a battery bank when you pick them up though, so maybe add some weight also for more realistic feel of a full battery bank.) Or use a rechargeable battery and use them for powering up devices like a regular battery bank.
There are 10 in the lot. Share with your friends or resell them as hide aways.
See photos.