Hi Ganesh,It is a very simple

[AJISH ALFRED]

Hi Ganesh,

It is a very simple calculation.

300mAh means the battery can supply 300mA for 60 minutes.

Your total current consumption is 425mA + 100mA = 525mA

If battery can runs for 60 minutes with 300mA, then it will run for

( 300 / 525 ) * 60 = 32 minutes.