xperia z1 screen usage (strange delay)

Dears xda
Good day..
Xperia z1 has a strange battery usage behavior..

The problem is that ( screen usage percentage%) will not be applied till i put my phone in sleep (idle) mode..

I mean when i am using my phone you can notice that battery % is freez or may be make a very little move around -1 or 2 % ... then when i go sleep idle mode .. i got a massive drain drop in % around 6 : 10 ... or more it depends on the awake and active mode time and the amount of my usage for apps.

( i tested this issue 3 times ... on airplane mode , wifi off and i disabled any apps that may affect the battery in idle .... the same result)
So i am sure the idle battery drain .. can be considered a delayed consum from active mode

Img. h t t p://i63.tinypic.com/263vo9d.jpg

I hope you can help me .. thanks

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