Location services, push notifications, and screen brightness are the biggest hogs of battery power. Unfortunately if you let the phone go wild with these things, I'm sure the battery would be gone half way through the day. Therefore I keep these items to a minimum.
I usually keep wifi and bluetooth on all the time so I don't have to think about it, but if I find myself < 10% and away from a charger, I'll turn them off to help stretch it out.
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