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IMO,
the best way to improve battery life is to just turn off DATA and WiFi when the phone is not in actual use.
Do it manually, or with a macro as I do.
As for turning off apps you don't want on a Samsung, there is just one good app for that job.
* Package Disabler Pro (Samsung) - Android Apps on Google Play
and it ONLY works on un-rooted phones.
I have used it for a long time, and it works.
Thanks.
Out of curiosity, which uses more battery...data through a carrier or wifi?