I recently bought an Anker PowerDrive 2 which converts my 12v cigar lighter socket into two USB ports. According to the specs, it can deliver up to 2.4 amps and 24w per port. I know that USB is 5v, and the adapter I've got converts the 12v from the car and outputs 2x 5v. My question is this: if I bought a dash cam, can I safely power it via a USB cable that goes into my Anker PowerDrive 2? Thanks!