We have tested TPS2116 IC, switching works as expected, and Ultra low current consumption. Our Schematic for testing is attached. V1 is our primary 5V DC Mains , and V2 is our secondary dry cell bettery (3 x AA = 4.5V-4.8V), When V1 off, system is shifted to V2, and if V1 on again, then system shifts to V1. There is one notice case that when V1 Switch from off state to on states, there is a voltage drop on V2 (Here V2, Battery is disconnected (open connection)) of about 100-200mV. and then after some time it slowly downs to Zero. And when V1 and V2 both are connected, then there is a current flow of about 0.1uA - 0.2uA, going into the battery . As mentioned earlier our battery is dry cell type non rechargeable, then this may create issue in future. Please guide us to solve this problem.