The Note 2 by default has excellent battery life. I dont see the need to use any 3rd party battery savings apps such as DSBS, Greenify, ICS Battery saver, etc. Such apps will not increase your battery life , say by another 1 hour , perhaps only marginal increase. I cane easily get 7-8 hours SOT on 3G mainly ; with WiFi usage 8-9 hours is commonly achieved. In a normal working day, no one will be using their phone 6-8 hours continuously unless you use the phone to work
I have since on my seconds unit did not use any more custom kernels n custom roms - everything is stock. And I am very happy with it especially with the latest official firmware
Compared to Note 2, I am only hitting 6 hours+ SOT on my Mega 6.3 on similar usage