There's plenty of safe lists online you can follow. That's what I did. Probably shut off about 50 services that were killing my battery. I even left Samsung push on and I still have great battery life. The app even tells you what's safe to disable. It's worth 99 cents. I can't even believe how much better it is now. Night and day.
Posted via the Android Central App on S7 Edge
It's understandable that people would worry about turning off something that would break their phone's functionality. However, I think some folks go too far in that direction when it comes to this sort of stuff specifically. You aren't uninstalling anything with apps like EZ Package Disabler or Package Disabler Pro. If something doesn't work right, you can always re-enable everything (in a worst case if you don't know what is causing the issue).
There's no question it helps with battery life, and those safe lists are here and on XDA, among other places.
The key, though, is to disable only the stuff you don't want or need. There are contrarians out there who say disabling things in this way makes your "smartphone dumb." No, it makes my smartphone do (kinda sorta) exactly what I want it to do, or do things in the way, and with the apps, I want it to do things. If you use a service or app, then don't disable it. There is plenty that all of us simply won't need. Of course, that list is different for each of us.
There is a bit of trial and error sometimes, but again, disable and enable as needed until you get it right for your needs.