Have you heard of the USB Condom before?
Yours looks similar but with OCP.
Great video; shows off the product really well, but I'm not quite sure why I'd buy one.
Most (all?) USB ports on PCs/laptops are protected by a polyfuse, and I've never heard of a charger accidentally sending huge current surges into batteries.
I'd actually be curious to know if this is possible to have a spike in the current without also spiking the voltage.