I bought the Nexus 5 to test apps on, and have left it sitting to test the battery (no non-stock apps installed), and it's been going for 3 days and is at 70% battery. That's phenomenal to me. I haven't activated it on a carrier yet, so maybe that's the reason, but Cell Standby in Battery Usage is saying about 15%, which is about normal on other phones I've seen.
I'm used to Verizon devices which last a day for phones and about 4 days for a tablet, so maybe it's just Verizon.
Can someone clarify on how good this battery actually is? Is it just that it's not attached to a carrier yet?