Default Anker 2200mAh 2-pack vs. Single Battery

I was looking on Amazon for the 2200mAh Anker battery and I noticed the battery alone is $19.99 whereas you can get a 2-pack plus wall charger for $25.99.
Are the two batteries included the same as the single battery?
It seems too good to be true considering how much a single battery is. Is the single just overpriced? I'd post links to the amazon pages, but I haven't hit the 10 post threshold yet.