Wlan off - still uses battery?

Hi,

some time ago I recognized in the detailed battery stats (settings - energy option - battery usage - detailed history) that the orange bar of the WLAN is constantly shown, what would mean Wlan is on all the time - what its not.

now I had some time for testing:
put phone for some minutes in fly mode
than turned fly mode off (mobile data on, Wlan off) waited a while

for that time in the stats, as expected, no activity for Wlan

than turned on Wlan for a short time and turned it off again. waited again for a while
in the stats there is Wlan shown as active/using battery from the point of turning it on and off again till now .. :silly:

Now is the question: is it just an error in the battery stats or is it really still active in the background .. :confused:

one way to find out would be, to check the battery life (with similar usage of the phone) with all 4 possible settings, each time a circle off full charge to empty:
1. WLAN off all the time
2. WLAN on all the time
3. WLAN on and off half the time
4. WLAN on and off half the time (putting phone shortly in fly mode after turning WLAN off)

that would be quite time-consuming and still not very accurate?!

battery stat apps seem to need root, so I cant use them :rolleyes: