[Galaxy Note 3 General] BarryH_GEG:
I think the extra four hours of video playback that Samsung quoted at the launch event are going to turn out to be true. Not because of some Samsung wizardry or a slightly larger battery but because of the efficiency of S-800. Here are some excerpts from Anandtech's battery review of the S-800 LG G2. Samsung's better with s/w than LG so I'd expect even better performance from the N3. Obviously comparing a LCD and AMOLED panel 1:1 isn't appropriate and typically AMOLED does better on dark colors (video) and LCD does better on light colors (web browsing). But the percentage gains Brian talks about in the review comparing the similar G1<>G2 should apply to the N2<>N3; maybe even more so because Exynos 4 is a far older design than the S4 Pro in the G1.

One of the things Qualcomm promised would come with Snapdragon 800 (8974) (and by extension the process improvement with 28nm HPM) was lower power consumption, especially versus Snapdragon 600 (8064). There are improvements throughout the overall Snapdragon 800 platform which help as well, newer PMIC (PM8941) and that newer modem block onboard as well, but overall platform power goes down in the lower performance states for Snapdragon 800. In addition the G2 has a few unique power saving features of its own, including display GRAM (Graphics RAM) which enables the equivalent of panel self refresh for the display. When the display is static, the G2 can run parts of the display subsystem and AP off and save power, which they purport increases the mixed use battery life case by 10 percent overall, and 26 percent compared to the actively refreshing display equivalent. In addition the G2 has a fairly sizable 3000 mAh 3.8V (11.4 watt-hour) battery which is stacked to get the most out of the rounded shape of the device, and utilizes LG's new SiO+ anode for increased energy density compared to the conventional graphite anode.

Our battery life test is unchanged, we calibrate the display to exactly 200 nits and run it through a controlled workload consisting of a dozen or so popular pages and articles with pauses in between until the device dies. This is repeated on cellular and WiFi, in this case since we have an international model of the G2 that lacks the LTE bands used in the USA, that's 3G WCDMA on AT&T's Band 2 network. I've tested 3G battery life on devices concurrently for a while now in addition to LTE though, so we still have some meaningful comparisons. The most interesting comparisons are to the Optimus G (APQ8064) and HTC One (APQ8064T) previous generation.

The G2 also charges very fast for its battery size. I've been profiling charging behavior and current for devices for a while now, since I strongly believe that battery life and charging speed are complimentary problems. You should always opportunistically charge your smartphone, being able to draw as much while you have access to a power outlet is critical. The G2 can negotiate a 2A charge rate on my downstream charge port controller and charges very fast in that mode. Of course the PM8941 PMIC also includes some new features that Qualcomm has given QuickCharge 2.0 branding.

​

You can read more here...

http://www.anandtech.com/show/7251/lg-g2-and-msm8974-snapdragon-800-a-quick-look/3

In addition, Samsung's implemented Qualcomm's Envelope Tracker chip in the N3 which (supposedly) is good for a 25% overall battery life savings because of enhanced management of radio signals.

The Note contains a Qualcomm chip called an envelope tracker, which will dramatically reduce the amount of power needed to run its LTE radio. We’re going to see this technology in a lot more devices.​

http://gigaom.com/2013/09/05/thanks...xy-note-3s-huge-screen-wont-kill-its-battery/