Battery problems
 

If I dont drive my car for anything over 2 days then the battery is flat and i need a jump.

I suspected a battery but been to 2 places who have check it and its come back as ok.

Is there a way to confirm the battery is shot before I pay for a new one?

If two places have concluded the battery is fine then perhaps a parasitic drain is flattening it. I have never had to trace one but there are videos on you tube about this.