Question

For use in DC Circuit calculations, can a battery be modeled as a capacitor?

Answer 1

I don't see how because the voltage across the battery is constant (the EMF) whereas the voltage across a charging capacitor increases with time

Answer 2

TT is as usual correct. A battery has an internal source of energy that supplies a potential difference between its terminals, whereas a capacitor *stores* energy (as opposed to generating energy).

Answer 3

Now suppose you have only a capacitor and a resistor in a circuit? Can you measure the voltage and current?