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by click170 4038 days ago
The option you are looking for is called "Keep Wi-Fi on during sleep" and it can be found under Settings -> Wifi -> Advanced on Android 4.3. This is the only device I can test with.

I advise turning it off unless you need it to be on, not only for privacy reasons but for battery life. I noticed an increase in battery life by turning that feature off.
1 comments
harmarsupercar 4038 days ago
On a Samsung Galaxy S5 running Lollipop (5.01?) it's under Wifi -> Advanced -> Always Allow Scanning.

With this turned off and GPS turned on (ie, not using Wifi to determine locations) I get a terrible reduction in battery life because all locations are done finely with the GPS chip. With all location services disabled I get much better battery life.

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