This is the simulation result of the circuit that i want to implement the battery power management. I intend to drive this circuit using 9V battery... Is it possible to do so? If it is possible, any suggestion on the regulator/ converter that I should use to make this circuit working?
You could bais the 0V nodes at half the battery voltage but some of the resistors are a little low for that. Another option would be to use another op-amp like the 741 configured as unity gain buffer with the input biased to half the battery voltage and 100nF capacitors connected between the output and the + and - rails.