Running Arduino using 7 Volts

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i planning of running arduino using 2 3.7 volt 350 mah batteries connected providing 7.4 volts, while reading through,

http://arduino.cc/en/reference/board?from=guide.board

the spec power supply says

external power supply in (9-12vdc)

does mean have supply min of 9vdc, afaik usb 5 vdc 500 mah no? according limited electronics knowledge should fine 7.4 volts , 700 mah?

what board have, duemilanove fine on 7 volts or more

http://arduino.cc/en/main/arduinoboardduemilanove


Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > Running Arduino using 7 Volts


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