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How Android's RAM management works.
General information about RAM.
Random Access Memory is a temporary storage of any android (and most computers) to hold data. Understand with simple example of kitchen, your fridge that stores food for long time is just like memory cards or internal storage, the kitchen table on which food processing occurs is RAM and the chef who do this processing is processor. RAMS are generally way faster than SD cards, re-writable and used by many ways by different OS. Read below to find out how your Droid manages RAM.
In android unused ram is simply WASTED RAM!
Android is basically UNIX based OS (Just like MAC OS X and Linux distros) and it would like to use maximum available RAM in system. Generally it would like to keep very few part of ram to keep free and available rest part is always kept full. Once you open any app, it will be kept on the RAM even after closing the app and so on. Once your ram is about to full and you want to start a new app, Android will automatically remove unused app data from ram. So how these help to improve performance? Obviously you'll be using some apps frequently, so loading this app again and again will create great impact on battery life and cpu performance. Thus by storing apps android makes your apps load faster.
Why you should not use any task killers?
What exactly your Task killers do?
Task killers are generally apps which force an app to quit or I say ERASE Cache from RAM which helps to make you phone faster as explain above, Task killers can be automated too.
Why you should avoid using Takes killers?
Sometimes you'll find BATTERY BOOSTING as a feature in description which is completely opposite to what it actually does. Once you run task killers its kills a lot of apps running in background, but some apps(IMs, Social apps) will automatically restart and consume more CPU cycles, leaving behind your phone laggy and draining battery way faster. So if you continue this many times you can expect a good enough DECREASE in battery life.
So what are better alternatives?

• Don't install unnecessary apps.
• If you've rooted your device, Use Greenify App and freeze apps you don’t want to use for some time.
• DO kill web based app which are still running while Internet is not available, you can do this directly from setting-->apps->running-->find app-->Kill.

Go and make you phone more snappy by removing task killer ;)

In this post I'll give you tips to save your Android's battery and a How to get A
FULL DAY battery?
Common tips (anybody can do this with ease) :-

1. Uncheck the Auto-Brightness and keep brightness to as low as 10%, also lower the screen timeout to 15 or 30 seconds. Add Power Control widget to your homescreen (comes preloaded with most phones). So you can increase brightness whenever necessary.
2. Don’t use Live wallpapers, If possible keep your background completely black, Black color is battery-friendly as well as eyeball friendly.
3. Don't keep Mobile data (2G/3G)/Wi-Fi/Bluetooth always on, simply turn off whenever not required.
4. GPS is another biggest battery eater. Don't turn on GPS unless you need accurate data (for navigation).
5. Turn off (or keep at least 1HR time between auto-refresh) BACKGROUND SYNC from social apps/web app, If you really don’t need them. e.g.
6. Facebook, Twitter, TapaTalk, G+.
7. Turn OFF vibrate/Haptic feedback feature as it consumes a lot of juice.
8. Use WI-Fi whenever available (at home), it impacts less on battery comparing to mobile data connection.
9. Disable bloatwares on your phone e.g. Samsung's S apps WARNING: Don't disable important system app.How to do this...Go to Settings->Apps->All apps->Select app(e.g. Samsung apps store)->disable.
10. Weak cell signals may cause battery drain to increase dramatically, because radio will try a lot to establish connection. So if you know there is very few possibility of getting connection then better turn on the Flight mode temporarily.
11. Don't use WEB based widgets unless you really need them. They increase load on CPU and indirectly on battery.
12. Some apps wakes your device partially to collect data aka a "WAKE LOCK". This happens many times in day. Run the app Wake lock detector and find out which app is causing too much wake locks. Wake locks increase battery drain. IMs are generally biggest source of wakelocks, Google apps are second.
13. Don’t use task killer/RAM Boosters.
14. Reboot your phone at least once in week. (Press and hold power button —> select shutdown -> wait untill it shuts down -> to start again press and hold power button)
15. Remove additional accounts (setting->accounts) from phone if you don’t use them.
16. Don't let your phone getting too much hot. This improves battery lifespan.
17. If you have 3G connection then Switch to GSM (2G) while browsing and switch to WCDMA (3G) when you want to download files or want to surf faster. 
18. Use Opera mini browser for just browsing its way faster than others and light on resources (battery, CPU)
19. Turn off Auto-Rotation when not required. Still you can’t get a day long battery then carry portable power banks

Advance tips:-
WARNING: I am not responsible for any thermonuclear wars, bricked phones. Rooting voids warranty, do it at your own risk. Do your own research before
doing anything.

1. *ROOT* Use Greenify (or Titanium backup) app and freeze useless appse.g. Social apps. WARNING: If you freeze IM apps you won’t get any message until you de-freeze it again.
2. Clear you cache at least once in month... Do this by Going to recovery —>Clear cache partition.
3. *ROOT* Undervolt/Underclock your device by using SetCPU when you don’t need much processor power.
4. *ROOT* Uninstall bloatwares which are useless in most cases. if you are not sure about certain app then better do a GOOGLE search about it.
5. Use app Tasker it is multipurpose tool to automate android by creating different profiles (e.g. turn off connectivity when display is turned off for more than 5 minute and so on)
6. *highlyAdvance* Install any battery friendly Kernel (such as Franco).
7. *highlyAdvance* Set to powersaver Kernel governors when you don't need performence.