How do you use the Canon PIXMA iP90 without plugging it into the wall-socket? -

My printer (canon iP90) will only print and turn on if it is plugged into a electric socket in the wall. This means that i can only use it at home near an outlet and i cant use it anywhere. I know this printer is capable of printing even in the car or park. Is it possible that it is supposed to have an attachment or is there a place i need to unscrew? Please I need help!

You need to purchase a Canon LK-51B Portable Kit which comes with a battery