ChiTownJim
Android Expert
Tbolt battery life sucked out of box due to poor early Qualcomm LTE chipset. Nexus has more efficient OMAP4 and different LTE chipset, so it should last longer. Also it seems like ICS brings some new power saving features.
As for battery GSM Nexus seems to have 1750mAh battery that's 350mAh bigger than Tbolt one. Also it's rumored that battery on Verizon LTE version is even bigger.
This is exactly why I'm not worried about battery life on the Nexus , if I'm happy with battery life on the Thunderbolt I should be much happier with the Nexus