How much battery does the bluetooth chip eats on standby?

[borgqueenx]

So when bluetooth is enabled on the iphone 5 how much battery does it eat? How much standby hours will be taken?
I know bluetooth 4.0 is better at saving battery but how much better?

Thanks.

 

[BlaqkAudio]

From what I've read, a negligible amount—it doesn't seem to drain battery any faster than having it off.