I love my USB pass-through, but my motherboard is worth a heck of a lot more. I don't know the answer to your question, but I hear there "could" be a problem so that's enough for me. I bought an AC/USB adapter to plug the pass-through into the house current and a Cigarette Lighter/USB adapter for using it in the car. Make sure the adapters you buy are rated at 2 AMP. I got mine from NHaler for about 10 bucks each. They work great so far!
Rich