QUOTE(gmhafiz @ Nov 14 2013, 05:30 PM)
I don't know if you own a nexus 5 but I do. I also like to present evidence backing up my claims.
I can get the phone through the day with similar usage as my sgs4. A reason why a 2300mAh battery could perform similarly to sgs4:
- S800 being much more power efficient than s600.
Source and formatted image I made

The table above is compared against s600. My exynos sgs4 would fare worse than s600. The information looks believable because my nexus5 standby time is much better than my sgs4.
Besides that, we know kitkat has reduced memory footprint. I have no concrete source but there are rumours of software optimizations to reduce battery consumption too although it is not far fetched.
Anandtech's tests are standardized. That has more credibility than some random people claim's with various unknown parameters such as whether google now is enabled, brightness level, location accuracy is high or low, wifi/4g/3g etc.
FWIW, I am happy with nexus 5 battery life. I haven't even root the phone or flash custom kernel yet
franco tells us nothing about his kernel

There's a possible battery leak which has been manually
solved by supercurio. I couldn't find where it is but if this is true, then I can expect longer standby battery life.
It's reasonable to expect Nexus 5 to have slight better battery usage than SGS IV. But it's unreasonable to expect Nexus 5 to last like G2 or Note3 due to lower battery rate.
I do agree that Anandtech's review is much more comprehensive that other websites. But regular people don't want to know about every single nuts and bolts in a device
Another battery bug with Nexus at launch? This seems like annual thing for Qualcomm. Same thing happened during Nexus 4's launch last year.
QUOTE(iOrange @ Nov 14 2013, 05:43 PM)
is nexus battery that bad?

No.It's decent. But it's not as good as the flagships from other OEMs.
Talking about the battery life really make me wonder how the heck LG managed to make Optimus G & G2's last longer than other devices which used similar hardwares. Their UI department suck balls but their battery optimization tricks are excellent.