Continuing from last message.

I already using Android for more than 2 years, and the experiences help me to extend battery life.
1) Disable any unnecessary features or eye candies. Example
a) Live Wallpaper
b) All animations
c) fancy launcher such as the 3D launcher

2) Dark or Black.. ). OLED panel will use more power to produce colors. The more colors and brigher, the more it consume power. I use statik solid BLACK as my wallpape. I read most of news using Pulse in BLACK/dark mode. If you can theme your phone, get the minimal or BLACK theme... BTW, black is very suitable for RAZR.

3) Use 2G, if you are travelling. 2G significantly less power than 3G/HSDPA. My RAZR  clocked 48 hours of battery life on 2G in minuinal use.

4) Use Wifi if possible. Wifi only use 10-20mW compared to 1W (max) on HSDPA/3G.

5) Use lightweight launcher... Currently, I am using Nemus launcher and I really loving it.

6) GPS... enable it only when you really need it. Most of the time, loication via celluar network's basestation is enough.
 
7) If you roooted your phone, set MAX CPU clock speed lower.. example 600MHz. and choose governer to ondemand, which only use 1 core all the time.

8) Unmount microSD if you are not using it.

9) Time to time, check task manager, and 'battery ise' information.

10) Auto sync... I prefer on-demand sync...

11) Minimal widgets..

Yeah,for some peoples, this may not fun to use... but..its help me to extend battery life,  much better than iPhon4/s.

TQ.