A battery is a "chemical pump" ... it uses chemical energy to separate the charges internally, generating an EMF, and the maximum pumping rate is the maximum current supported.
A capacitor is like an empty tank, which the pump can fill.
Kartikwat, you seem to be asking a lot about electrical circuits. May I recommend a book on basic electronics? You can find plenty of them at a local bookstore or online.
Just to be clear, I'm not suggesting any particular book, I'm suggesting that you go out and purchase one for yourself if you haven't already. A search for books on basic electronics or electronic circuits should turn up plenty.