What is amount of current required for p-mosfet when load is not applied?

[Sai teja]

Hello, I am using p-channel MOSFET(NTR4502PT1G) in my application in the configuration shown in the image. If 9 V input is absent, p-channel MOSFET (NTR4502PT1G) turns on, and battery power is supplied to entire system if on/off button is switched on.

I would like to know the amount of current drawn from the battery when on/off button is turned off, the 9V input is not connected to gate terminal of MOSFET and battery is connected to the source terminal.   

Please help me in this regard.

[bson]

None, because there's no closed circuit.

[Ian.M]

The datasheet says under 100nA of gate-source leakage.   https://www.onsemi.com/pub/Collateral/NTR4502P-D.PDF page 2 near the top.

The battery's self-discharge will dominate  e.g an Energizer 522 PP3 9V alkaline is expected to loose 20% of its charge over its five year shelf life.   Its capacity is about 600mAH.

120mAH/43800H = 2.74uA equivalent self discharge current.