[BetterBatteryStats] Oswald Boelcke:
I apologise for continuing our conversation so late but I lacked the time yesterday. I had a look into your log again and realised that it isn't unluckily an idle log. If you look through all battery life related threads, only idle logs can provide sufficient indications how to decrease battery drainage. Second, I'm quite "paranoid":o in regard to privacy i.e. I don't and won't ever use things like FB, Whatsapp etc. and am not having experiences with them. Also, my device only carries a minimalist suite of Google (only flashed pico and even uninstalled some of that crap) 'cause I only use Play Store (unfortunately, some of my favourite apps incl. their betas are only available there) and broad location. If I'd get MicroG to run on my device Google had already been totally eliminated. I control Google's "tendency" to call home by AFWall+ and NetworkLog, have limited quite a few of its services and broadcast receivers, and "greenified" and "amplied" them.

But back to the topic of battery endurance; however, I don't know what you're already using (but from the log I recognised at least Xposed is already available). I do not intend to make any recommendations, I just tell you what I did to obtain my current satisfying battery life, and you can draw your own conclusions if you like.

When I got my pretty old and used SGS3 LTE GT-I9305 about a year ago, it was running on CM10. On XDA, I started to search for others ROMs, thoroughly read the OPs and the subsequent posts, flashed and tried a few of them, till I've ended up in the configuration (available in the hidden part of my signature) I'm now using for nearly nine months. I'm extremely happy, and my phone completely fulfils my requirements and desire; thanks to [mention=4613083]rodman01[/mention], the dev of "my" ROM, I certainly don't need a different phone.

Quickly, I figured out too that a custom kernel was able to exactly achieve the mix between performance an battery duration that I wanted. My current kernel not only offers a very large variety of governors but also a great and very easily to use control application. Nonetheless, if required I'm tweaking my system by tools like L Speed by [mention=5514152]Paget96[/mention].

Please be advised that for all mentioned tools, I started by using the recommended settings in their OPs if available but eventually commenced to experiment with different settings until I achieved the results I wanted. This certainly also applies to the use of e.g. different governors or other kernel settings. I collected some of the guides and tutorials, which were very useful and supportive to me, in post #3 of this "How-to...". This whole thread is meant in conjunction with the SGS3 but some parts might be helpful even for your device.

We talked about ROMs and kernels, now lets mention the other key players for my satisfying battery endurance but you certainly need Xposed: Greenify, Amplify and PowerNap. I tried all of them, it worked out for me, and I'm continuing to use them; however, that what I stated in the paragraph above applies for them too: Comply with the recommendations and develop it further till you are satisfied. Remarks: 1. I don't use AppOpsXposed because I run XPrivacy. 2. If a donation possibility is available please consider to use that as you occasionally get a better capability and you're supporting the dev and the development. 3. None of the mentioned apps has got permission granted to the internet and all are spoofed by XPrivacy. I'm pretty cautious regarding applications if they have so much power due to root and Xposed, especially when they have a Chinese origin (a reason why I don't update my SuperSU anymore and continue to use it in v2.76, the last one really being from Chainfire).

Now, you know more or less what I did to achieve a really good battery life.

BTW but OT: The "bvb" in your username isn't somehow related to the best football team in Germany, is it?