So I have made a few posts in other threads about my skepticism of a Nexus 5 with good battery life. We have all seen the rumors and the FCC filing with the listed specs. Larger screen, beefier CPU, LTE, and only a tiny bit larger battery. At first it seemed to me that battery life would likely not be any different. Upgraded specs would likely cancel out the minor battery improvement. However, I think we have a little more to go on now that Anandtech has released their G2 Mini Review. If we look specifically at the battery section, they talk about the lower overall power consumption of the Snapdragon 800, the inclusion of GRAM, and a few others. These combined with a 3000 mAh battery provide fantastic battery life for the G2. Now, rumors point to the Nexus 5 having only a 2300 mAh battery, which is approximately 77% (2300/3000) the total capacity of the G2's battery. We do not know if the Nexus 5 will include all the power saving features of the G2, like GRAM for example, but we do know it will include a more energy efficient Snapdragon 800 if the FCC filing is to be believed. And if the Nexus 5 is based on the G2 in the same way the Nexus 4 was based on the Optimus G, it wouldn't be too far fetched to assume the Nexus 5 will have GRAM to cut down on power drain. So making that assumption, we can make some educated guesses as to the battery life on the Nexus 5. In order to get an idea of the Nexus 5 battery life, all we simply need to do is look at the G2 battery life benchmarks and multiply them by .766 (2300/3000). If you look at the first benchmark, the G2 comes in at 8.533 hours of 3G web browsing while the Nexus 4 comes in at only 4.15. A Nexus 5 with the same hardware as the G2 with a 2300 mAh battery could bring around 6.536 hours. With WiFi web browsing, the G2 gives 10.73 hours, the Nexus 4 6.27. A Nexus 5 could bring around 8.22 hours. Talk time is where you see the G2 really shine at 23.5 hours. The Nexus 4 is only at 7.82. A Nexus 5 could bring around 18 hours. Now keep in mind, this is 100% speculation. Running stock Android would obviously have an affect on the battery life. And seeing as how the Nexus 5 isn't even official yet, this may be completely off. All this really shows is battery life of an LG G2 with a 2300 mAh battery. But if rumors are to be believed, that could be essentially what the Nexus 5 is, just with a slightly smaller screen, different physical design, and running stock Android.