Originally Posted by HBLush
I know that this is not the rooting section but what helped me was the battery calibrator. You have to be rooted to use it but it easily added 20% more to my battery life. Also, some roms specialize is battery sipping(like Humble 5.0) There is also an extended battery that you could get if you dont want to root.
+1. Rooting is the answer to about three quarters of the questions asked in this section!
I'm rockin Humble 3.1 (still...not going to switch until Humble 5 comes out of RC or until an ICS complete ROM is released) and can easily go all day with pretty heavy usage (emails, tapatalk, youtube vids, uploading pics, web browsing, wimp, etc).
Also try the Screen Filter app. No need for root on that one. It dims your screen down to a level you can adjust, and it works with the auto-brightness. These AMOLED screens suck the juice quick when sitting at max brightness.