I regularly open and close Wifi, send a 'spurt' of data, and shut down the Wifi. This is on a system with a 400mAH battery, it stays on for days and days witho

I regularly open and close Wifi, send a 'spurt' of data, and shut down the Wifi. This is on a system with a 400mAH battery, it stays on for days and days without much fuss .. certainly BLTE and co. (where is ANT+ these days?) are lower-energy, but even if its only 'just close' in terms of energy efficiency, all the advantages of using Wifi instead of Bluetooth are huge.