[Q] Why is my battery draining fast on WiFi?

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http://forum.xda-developers.com – I had a 3 month old S3 that was draining the battery really fast. I tried everything from a new battery, to flashing back to stock and installing absolutely zero apps. No matter what I tried, the phone was chewing through the battery, even when I wasn't touching it. I would go to bed, wake up, and the phone had lost 20-30% battery.Verizon sent me a replacement, and the same thing was happening. What I failed to try, was to turn off WiFi, because I thought WiFi saved the battery. Once I turned off WiFi, I went to bed, woke up, and I only lost 5% battery. Why is WiFi eating my battery so fast? I (HowTos)