I have been alternating between the stock battery and the TP2 battery (which I got off ebay for cheap). The TP2 battery is thicker than stock and will warp your battery cover if you charge the batter in your phone with the cover on (happened to me once already). Now when I use the TP2 battery I just leave the cover off.
Also, I've conditioned my stock battery and get a solid 12+ hours out of it with a significant amount of use.
Samsung Galaxy Nexus
Set sail from Hawai'i nei, docked in Cali-for-ni-a