Well, if that was the case then we couldn't charge it from the wall adapter. I still think there is an issue with USB extension cables. I've moved to using a regular AC extension cable between the wall outlet and the AC-to-USB adapter, and have given up on the USB extension cable. I don't understand why it would matter and was hoping someone would chime in with an answer. Using a heavy AC extension cord is less desirable than using a thinner USB extension cable.