Those don’t look to be Alkaline, so I wonder how well they’d hold up…“extra heavy duty” doesn’t really have a precise technical meaning. 
According to Wikipedia, an Alkaline AA cell has a capacity of 1800-2600mAh under a 500mA drain. The woot page lists these batteries at 900mAh.
This, on the other hand, looks like a bargain, and great fun to boot:
@ devhammer - I was looking at that one last night. So hard to not push that button… Until I look beyond the monitor and remember that my kids already have more toys than we have room for. 
We’ve already got bunches of K’nex, so I figured what’s a few pieces more…in for one. 