To find polaroid instant camera

You don't. The PIC-300 works with Polaroid 300 Instant Film. The Zink photo paper is for use with the Pogo printer.

The battery built into the long-expired film has run flat. The only fix is to insert fresh film, Polaroid don't majke it any more, but The Impossible Project make compatible film with just 8 exposures instead of 10 per pack.

The battery is built into the photo pack, so when you load a fresh photo pack from The Impossible Project, you get a fresh battery. Photo packs are and always have been expensive, so this guarantees you don't end up with a flat battery halfway through a photo pack. Note that all original Polaroid manufactured photo packs are now so long out of date that they all have flat (or very nearly so) batteries; you should only use them in specially modified cameras using an external 4.5v dc power supply, but even then you may find that the photo chemicals are so old that they do not perform as expected (if at all).

A video showing you how to load the photo pack on any typical 600 series Polaroid camera is here if you need it., courtesy of Kaituba on YouTube.

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.

I am found of this kind of camera and I can pay you 80 dollors
Thanks

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.

What lovely memories must be stored. I am quite happy to offer my services to convert these movies to DVD. Whilst most companies would not touch Polavision cassettes, I am able to do this no problem.  Please contact me regarding quantity, etc. and I will give you a reasonable offer. 

Having photographic quality copy prints made will give you far longer life than the original Polaroid. Polaroid colour dyes will shift colours and eventually fade dramatically. New photographic (and some ink jet) prints will last generations without noticeable fading.

There should be a button on the left side of the camera that releases the door on the front of the unit. The film pack slides in film side up.

read my suggestions to others on polaroid cameras.
don't throw good money after bad.

pc-cook