Where goes te battery in?

The batteries for Polaroid 600 series cameras are located inside the film pack. Polaroid discontinued manufacture of their film in 2006, a company called The Impossible Project has began limited production of some of this type of film but it's selling for about $20/10 photos.

Here is a link to the Polaroid SuperColor 600 series manual. I hope this will clear up any questions you have about your camera.
Please let us know if this helps sort things out or not. Cheers.!
Polaroid 600 Series Camera Manual pdf

Polaroid OneStep cameras have the battery built-in to the film back. If you are using Polaroid 600 film, simply change the film cartridge.

How old is the film in it?

Polaroid film packs have a battery included (a polarpulse powercell, I think).

If its an old film, the battery can go flat and as far as I'm aware there's no way to get power in to it.

I would take the cartridge out, (effectively not use the last shot), try a new cartridge to see if its working properly, then send the old cartridge back to Polaroid, if you think its faulty.

The battery for the Poloarid is in the film pack.
Each film pack has enough battery power to shoot the film in the pack.
The problem is that if the pack sits around for too long the battery will die making the film pack useless.

If this helps please vote for my solution.

The battery is in the film pack.try to replace it from there

It uses one disposable battery builded with the film, try this.

If the camera is showing no signs of life at all then you probably have an old stock photo pack loaded into it. These have the camera battery built in to them and like all batteries have a finite shelf life.

If you have a voltmeter then remove the photo pack and measure the voltage on the electrical contact points on the underside, if it's below a steady 6v then the battery is dead. If not the camera is dead and you can pick replacements up for less than the cost of a photo pack from thrift/charity shops and there's plenty of free ones available on Yahoo FreeCycle

This is a Polaroid 600, sometimes called the 'land camera' in an older guise, and this is the film and battery.
http://www.epinions.com/review/Polaroid_600_Instant_Film_10_Photos_074100239660/content_353231081092
See, the battery in this camera comes in the film package. It is on the bottom of it, when you take out the cartridge when you have taken all 10 pictures (it only holds 10), you will see a paper and silver bag left at the bottom. There's your battery.
So if it really is a polaroid 600, when you replace the film, you replace the battery. If the battery quits before you used all 10 prints, there's nothing you can do but replace both of them and waste the rest of the shots.
I have worked with photos for years, and never seen a cartridge with more than 10 prints in it, for that camera. Not saying it's not possible, but I think you'll find there's only 10.
Good luck!