How much extra battery is double tap to wake using on your phone?

[mogelijk]

I've noticed that double tap to wake appears to drain my battery faster -- I've not done a real test but, from my limited watching it, it seems to take my battery life down 2-4% per hour instead of 1-2% when my phone is idle. Just curious if anyone has tested this and if others are seeing that it is basically doubling the battery use when the phone is idle?

 

[crash1989]

honestly should never turn it on for a lumia 920 .. I ran through pretty quick and had to charge my phone twice in 8 hrs. Didn't check the %, but turned the double tap of it has been a bit better. But I think the :CD screen on 920 is bound to lose charge coz of glance.

 

[broar94]

Believe it uses the promixity sensor just for the functionality?