capacitor - How to calculate equivalent capacitance to a battery?

I have a 1.25V 2Ah battery and I'm trying to calculate a equivalent capacitance with rated voltage of 2.7V for each of those batteries. This is what I did:

Work of Battery = $1.25V \cdot 2A \cdot 3600s = 9000J$

From the capacitor work equation:

$$W = 0.5 \cdot C \cdot V^2$$

$$9000J = 0.5 \cdot C \cdot 2.7V^2$$

$$C=2469.1358F$$

Is this correct?