Battery powered device with burst wifi connectivity

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Monday August 3, 2015
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August 3, 2015
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Hi,
I want to make a battery powered device with wifi connectivity. To save battery power, I want to power up the device every 20 seconds or so, exchanges data with router, then shuts itself down. my battery will be 3.3V. My data packet size will be small (about 200 bytes). I wonder each time after powering up the wifi how long time is needed to establish the wifi link, and how much power the wifi will consume to exchange the data packet of about 200 bytes.
Any help is greatly appreciated.
kg21