[Galaxy S II Q&A, Help & Troubleshooting] Skully☺:
Some tips for better batterylife

For tweaking the battery you should first learn about lots of the settings that influence battery usage. I'll give you some links so you can do the reading yourself. If I'm linking to xda threads, read the opening posts (sometimes more than one) of each individual thread from A-Z:

1. Batterylife:

- http://xdaforums.com/showthread.php?t=1179809 (BetterBatteryStats thread)

- http://asksven.github.com/BetterBatteryStats-Knowledge-Base/howto.html (BBS how to)

- https://github.com/asksven/BetterBatteryStats-Knowledge-Base/wiki/_pages (explanation of several wakelocks)

- http://xdaforums.com/showthread.php?t=1656705 (explanation of l2_hsic wakelock)

- http://xdaforums.com/showthread.php?t=1827676 (Total Newb's Guide to Wakelocks)

- http://xdaforums.com/showthread.php?t=1909996 (tips for batterylife)

- http://xdaforums.com/showthread.php?t=1466017 (Geko95Geek's tips for batterylife)

- http://xdaforums.com/showthread.php?t=1111581 (fast dormany 1, read all the posts on the page)

- http://xdaforums.com/showthread.php?p=36396636#post36396636 (fast dormancy 2)

- http://xdaforums.com/showthread.php?t=1369817 (govenors, modules, schedulars, CPU tweaks)

- http://xdaforums.com/showthread.php?t=1312273&highlight=galaxy+s2+battery+calibration (OP and posts 31 & 192)

2. Recovery and rooting:

- http://www.addictivetips.com/mobile...-and-how-to-use-it-on-android-complete-guide/ (how to use ClockWorkMod Recovery)

- http://www.addictivetips.com/mobile...plained-boot-system-recovery-data-cache-misc/ (Android partitions explained)

- http://www.addictivetips.com/mobile...rom-zip-file-to-android-device-from-recovery/ (installing from Recovery)

- http://xdaforums.com/showthread.php?t=1592104 (what after having rooted your phone)

3. Apps & drivers:

- https://play.google.com/store/apps/details?id=com.mhuang.overclocking (Set CPU)

- https://play.google.com/store/apps/details?id=com.darekxan.voltagecontrol (Voltage Control)

- https://play.google.com/store/apps/details?id=com.gokhanmoral.stweaks.app (STweaks)

- https://play.google.com/store/apps/details?id=com.manor.currentwidget (Current Widget)

- https://play.google.com/store/apps/details?id=com.gokhanmoral.fastdormancytoggle.i9300 (fast dormancy toggle for i9300, but works for i9100 as well)

- http://drivers.softpedia.com/get/MOBILES/Samsung/ (Samsung USB driver list)

4. Beginners guides:

- http://xdaforums.com/announcement.php?a=81 (forum rules)

- http://xdaforums.com/showthread.php?t=1466228 (Android slang, terms and definitions)

- http://xdaforums.com/showthread.php?t=1699450 (nice new user guide)

- http://xdaforums.com/showthread.php?t=1949604 (overview of new user guides)

5. Additional:

- http://xdaforums.com/showthread.php?t=1974338 (guide - don't know something, look here first)

- http://xdaforums.com/showthread.php?t=1726238 (how to logcat)

- http://www.linfo.org/dmesg.html (how to get kernel messages)

- http://www.linfo.org/command_index.html (overview of Linux commands)

Note: if you're using CyanogenMod10.1, its kernel doesn't allow undervolting since the Android 4.2.2 updates from february 2013. At the moment (march 10, 2013) Siyah kernel S2-v6.0 beta 5 doesn't support CM10.1.

Before you make any changes, be sure to have a good backup strategy!

If things are difficult, maybe take a pen and paper and make notes of what you're doing.

Remember: it is

you

who decide to modify your phone, not someone else, so don't blame anyone but yourself when something happens.

I'm not doing this to annoy you or to look interesting (hell, I don't know all of above by heart, but at least I know where to go if I want an answer; the more I learn, the more respect I have for the developers), but I haven't been on stock ROM since ages and don't know where the all settings are that are relevant. There are a lot of things you have to know about, especially when asking for help.

If you really want to learn, this may be a nice start.:good:

And of course: maybe other members have other apps that can be of use too:D

See the above notes.

I don't know why the zip failed, neither if your phone got hot or if there were other symptoms.

When you want help, you must help us to help you by providing the relevant information.

If you want know a bit about batterydrain, at least start with betterbatterystats and learn to make a log. Look at it and if you see the names of wakelocks, google them or read about them in one of the links I posted above.

Good luck and feel free to ask:good:

PS: I am not a n00b but merely a newbie:p

Post-PS: Read the thread and use the search function!