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RAM is different than your phones internal storage. Don't worry about how much RAM is being used. Android will kill off the apps not being used when it needs more RAM.
Correct. And apps showing as "running" aren't actually running and will not kill your battery.
Stay away from task manager apps that kill these apps
why should I avoid task manager? elaborate .
So my $0.02, just disable the app and not worry about it, unless you want to root your phone