Casio CZ/ VZ/ FZ - Pro Series

I recently picked up an old beat up CZ-101 from a flea market. 
When I got it home it wouldn't power up using my Sk-1's adaptor. I 
tried to use batteries (carbon comp cheapies, but it didn't power 
up. I thought to myslef oh well there goes $5. Then I looked at the 
postive battery lead and saw that it there wasn't any metal making 
contact with the batteries. So I put a piece of aluminum in to give 
it a conductive surface and that kinda worked. It would power up and 
play momentarily, but it would crash if it was jared.

  So the problem is now it only powers up for a few seconds before 
it crashes which makes it imposible to play.

  What the heck should I do?