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Running STM32f4 Discovery Board from a DC voltage (Beginners question)

Question asked by itkin.tal on Jan 18, 2014
Latest reply on Jan 19, 2014 by Clive One
My project is to drive some SPI external sensor with 3.3V and read its data. 
Since this sensor consumes a higher current that a single I/O can supply I intend to drive this sensor using 3.7V battery.

As noted in STM32f4 Discovery Board datasheet the board requires a 5V power supply.
After all I am intrested to operate all the project (Board +sensor) from a single voltage level battery/batteries. 

Could it be a 3.7V battery  (<5V)? 
Or may be 7.4V (two batteries in a series) is better (>5V)?

Thank you!