[shorod]

Does it just stall immediately, or does it sputter, bog, etc. before stalling?

Does it only stall if you put it in park, or will it stall if you shift to neutral? Does it start right back up and idle fine? What if you restart it and shift from park to any of the other gears and back to park without actually moving the car (hold your foot on the brake)?

I'm not thinking of anything that would likely have been done wrong when putting in a new battery to cause this. Unless they put in an "R" battery and your car takes a non-"R" battery (Reverse polarity), then after they hooked it up noticed their mistake and put in the correct battery, then didn't notice any problems so didn't mention it to you. This is a stretch, and not likely to happen, so I certainly would not suggest you accuse them of that.

-Rod