Best solution for Wireless Sensor Network

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hi, need board low power mcu, plug/charger lipo battery , xbee socket.
i need run board 3-4 months reading each minute temperature , humidity.
i've seen arduino pro or arduino fio.
1) real time clock circuit necessary deep sleep operation mode ?
2) use normal aa batteries ?
3) there specific zigbee module can use save power ?
i'm sorry these questions.
thanks in advance.



the real time clock needed unless have way trigger interrupt. so, if have generate pulse every minute, rtc not needed.
there nice lipo charger boards here:
http://www.adafruit.com/category/44_138
you can use battery indicator kit check if battery voltage low:
https://www.sparkfun.com/products/11087


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