5V USB power output for camera battery grips

I think I found the right part to add a 5V USB power-output to the DIY battery-grips I am making for my cameras. The idea is to hide this regulator in the dummy-batteries, so they don't take up precious space in the cramped battery-grips. http://www.hobby-hour.com/electronics/lm2576-step-down-switching-regulator.php
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