It depends. You have to look at the letter on the sticker on the side of the box underneath the "120V". A = 1.50, B = 1.51, C = 1.52, and so on. I think you want to look for between A-I. Those should be downgradable. And keep asking the lady at Wal-Mart to pull out another and another till you find a good one. Thats what I did :-)
But about the core pack; I know it was released between 2.60 and 2.70, so I would guess 2.60.
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