Ice Cream Sandwich melts quick...here's some tips to save your battery!

Ice Cream Sandwitch PART (Android 4.0.x) :

Settings > Wi-Fi > Advanced > Network notification : [UNTICK]

Settings > Wi-Fi > Advanced > Keep Wi-Fi on during sleep : "Always"

Settings > Data usage > Set mobile data limit : [UNTICK]

Settings > Call > Call rejection > Auto reject mode "OFF"

Settings > Sound > Vibration intensity > Set everything to Minimum

Settings > Sound > Everything in "System" part [UNTICKED]

Settings > Display > Weather > [UNTICK]

Settings > Display > Brightness > Automatic brightness > Set it to Minimum

Settings > Display > Screen timeout > "15s"

Settings > Display > Touch key light duration > "Always OFF"

Settings > Display > Auto adjust screen power > [TICK]

Settings > Location services > Everything [UNTICKED]

Settings > Back up and reset > Everything [UNTICKED]

Settings > Date and time > Automatic date and time > [UNTICK]

Settings > Date and time > Automatic time zone > [UNTICK]

Settings > Motion > Motion activation > [UNTICK]

Settings > Developer options > Windows animation scale > "Animation is OFF"

Settings > Developer options > Transition animation scale > "Animation is OFF"

Settings > About phone > Software update > Everything [UNTICKED]