Android "Task managment / killers"

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http://forum.xda-developers.com – What's your opinions on these? I use Android Assistant (18 Features) to clear out some apps that don't need to be running and "boost" my system.... But I was told all that does is cause instability, and battery life to depleted faster. I also use it to monitor my battery life and what is using the battery and how much of it. (HowTos)