[Galaxy Note II Q&A, Help & Troubleshooting] therockk:
Hi, ill tell you a little bit about myself and then get into suggesting how you can get better battery life. Okay, i have a Note 2 flashed with WanamLite V2.0 & RedPill Kernel. The battery when i got my Note 2 on the stock rom was great. But i ventured into a custom rom for the further enhancements to my experience. So i flashed on WanamLite ROM V1.5 and the regular RedPill Kernel (Rev.0.5), With only Power saving mode on and brightness set to Auto. I would get approx 20 hours total time & 8-9 hours scree on time. Then of late i decided to try out Omega ROM V7.1 + uNEAK Kernel. = Results were the battery life and performance sucked! So within 2 hours i flashed back on the newest version of WanamLite ROM (V2.0) and this time flashed RedPill Ultimate (Rev 0.7). (This version of RedPill kernel had the ability to undervolt the phone so i decided to try it out.). I undervolted each clock speed -50mV. And than my standby time went to 27 hours with 10-12 hours screen on time. (With the same settings as above). This week i decided to give Omega ROM one more chance. So a few days ago i flashed on Omega ROM V7.2 + RedPill Kernel Ultimate Rev 0.7. This time my experience has been amazing. I get better battery life than WanamLites ROM. (And i also undervolted the phone the same way as i did previously.) So as of now my total standby time is approx 30 hours with 10-13 hours screen on time.) I also have my WiFi sleep policy set to "Never" And under location services i have all 3 options uncheckmarked, motion turned off.

Getting good battery does not only depend on the OS / Kernel, it depends on you as well. And your habits. What features you have turned on. (E.G, Wifi, Data, GPS, Bluetooth etc.). Here is what i would recommend you try out:

1. Flash WanamLite ROM (V2.0 or newer).

a) While in Aroma Installer choose NOT to install any of the Bloatware. (AllShare, Talk, Yahoo News etc.)

2. Flash RedPill Ultimate Kernel (Rev 0.7 or newer).

3. Install SetCPU. Set governor to Pegasusq, and IO Scheduler to Deadline. (I get the best battery life with this combination).

4. Undervolt the CPU Clock-speed's by -50mV.

5. Turn Power Saving Mode ON - In settings.

6. Turn OFF Motion based features.

7. Set WiFi sleep policy to Never.

8. In settings under Location Services. Uncheckmark all 3 options.

9. Turn LTE OFF (If your phone has LTE).

10. And if your using a WiFi network, turn Mobile Data OFF. And vice-versa.

11. If using Bluetooth, turn it OFF when your immediately done. Same goes for GPS.

12. Leave brightness set to Auto OR under 30%-40%.

13. Invest in Titanium Backup, and use it to freeze or uninstall bloatware or junk software you DONT need! Also use it to regularly backup your apps, in case you need to flash another rom in one touch you can restore all your apps!

Try my above suggestions, and if you are still getting horrible or bad battery life than there most likely is a defect in your battery! With doing the above, you should at MINIMUM get 1 day out of your battery! (With doing the above, i can get upto 3 days!!! With medium usage! And atleast 2 days with heavy usage!)

My $0.02 cents, hope my suggestions will help you!