Supply 3.3V to two devices from one battery?

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i have xbee transmitter: https://www.sparkfun.com/products/8665 specs are:

3.3v @ 50ma
250kbps max data rate
1mw output (+0dbm)

and co2 sensor: http://www.co2meter.com/products/cozir-0-2-co2-sensor specs state:

power input: 3.3-5.5vdc (3.3v recommended)
33ma peak, 1.5ma avg power requirements

the sensor running in streaming mode states in manual power consumption 3.5mw in mode.

i have battery: https://www.sparkfun.com/products/8483 specs are:

each cells outputs nominal 3.7v @ 2000mah!

three questions:

can wire splitter both devices 1 battery power both?

how step voltage down 3.3 3.7?

how calculate how long expect battery keep things powered based on power consumptions listed above?

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can wire splitter both devices 1 battery power both?
yes

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how step voltage down 3.3 3.7?
i use buck converter. voltage difference small conventional linear regulator.

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how calculate how long expect battery keep things powered based on power consumptions listed above?
a bit more tricky mah figure not specify discharge rate. rough idea, add current divide mah figure current, , take 80% of that.


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