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Help with diode dissipation - Arduino UPS

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Peabody:
I tested the IRLML6401 mosfet I had chosen, and at 1A I'm getting a 0.1V drop across the mosfet.  That indicates Rds of about 100mΩ.  That's double what the datasheet says it should be, but I was using a breadboard, so that may have been the source of the additional resistance.  Anyway, if my math is right, that's 100mW dissipated in the SOT-23 mosfet, which I think it should handle ok.

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