Hey all   Complete dunce when it comes to electronics and power ratings [i'm a bean counter!!]   So, got 2 5v fans with usb connectors from ebay.   Already had a usb powerbank. It has 2 usb out sockets. Rated at 5v 1.0a and 2.1a.   Quickly tested and they both spin fine [didn't blow up in my hand!!]. Can tell the 2.1a side is spinning faster though.   Any possible issues? Looks a cheap way to have 2 fans blowing off 1 usb battery.