how can i make my battery last longer?!

Oh ok.  You probably have the free version of advanced task killer then.  I don't recommend you to get the full version because it will start mess with core apps and it can get pretty ugly.

I don't really use auto kill function because ATK freezes up my phone sometimes when multi-tasking.  I set everything manually.

However, if you want auto kill on:
1. press hard key on the very left bottom(the one next to home key) and press setting.
2. 'Check on auto start' and 'show notification'
3. Set auto kill level and kill frequency.  You can set this as aggressively as you want; ATK free version is quiet friendly.
4. leave everything alone.

Ignore list (When you first open your ATK, long press apps to ignore)
foreground apps: daily briefing, voice commands, google voice. Mail apps are synced to your phone, so you can set 'em to kill.
background apps: anything that needs to be turned on 24/7 such as fancy widget, clock apps, extended controls, etc etc.

Hello All, new to the forum. Thx for the battery saving tips.