According to Anandtech's Bench tool....the same site that found out that the G Nex was showing LTE readings accurately....and overall is a pretty good site to go to for info....the Verizon G Nex battery life is low over all vs. the other LTE phones on Verizon. Talk times being the biggest differences. I truly believe if you get the G Nex...you will have to found out all the tweaks to get the best battery life out the box. All I really have to do for my phone is have the screen brightness down and micro manage data use.
Some ppl that post the screens dont really say if its extended batteries, how long the screens been on, if they are running custom kernels, etc. Just test a G Nex vs. another LTE phone if you have that luxury...thats really the only way to tell. I always judge out the box performance with these phone for battery life, reception, performance. Tweak any phone good enough and it can have good to great battery life.... along with how you use the phone.
I will say tho any phone having reception, signal issues might have worse battery life than a phone with a more stable connection. Some of us dont realize that reception, signal issues can be as big a drain on the battery as just using the phone. I plan on doing some long term testing when I switch to a family plan between at least 3-4 phones.