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Your particlar Wifi installation will also influence how much Wifi will eat into your battery budget. Near your access point and without obstructions any wireless communication will use much less energy than when you are in a remote room, maybe on another floor and with concrete & steel in between.
It can even give you a two-fold penalty, in terms of sending power as well as in terms of sending duration, as speed may drop heavily so the radio needs to be on much longer.
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