Plug in USB and battery simultaneously?

This is a basic question but I can't find the answer. Am I going to fry anything if I plug in USB and a 7.4V LiPo battery (in Vin/GND) at the same time? The board is the Uno R2. Thanks!

Nope, you'll be fine. The Uno will use the LiPo battery source over the USB in this case.

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