[Q] Killing apps

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Hi there, I am wondering if killing apps that I don't use will increase battery life or just freeing up some RAM?

If it does increase battery life, any app recommendation? I don't need it to auto kill, I can press it each time the phone boot. I tried some already actually, like Advance Task Killer but some apps labelled green can't be killed? I am not sure, I am new to this.

Thanks

You don't need a task killer at all, in fact it's better NOT to use one.
Also have a look at this post where I wrote a little about this.

Android is designed to kill apps on its own whenever it feels that your RAM is getting full. I used Killer apps and it only made my phone worse!

So its better not to use one