The flex is the fuse, silly.
Ha! For the power brick it's connected to, it's not up to any proper standards but probably fine, but what bothers me is it's an IEC lead so someone could easily use it on a far more inappropriate load, like a kettle.
I forgot to add aliexpress is great for innovative battery stuff as well (although I wouldn't trust a lot of the claimed ratings). I've got a cracking AA battery that's actually a li-on cell with a mini usb port for charging it that I use in a wireless mouse that's been in there since the start of july and I just bought a similar 9v battery for £1.50 more than an alkaline PP3 as I left my multimeter on and flattened it (again).
And if you think those purchases are fucking boring, I took delivery of a gallon of hand soap this morning.