I've found, at least with my Nexus 10 anyways, that occasionally powering it off and then giving it a fresh boot will significantly reduce idle battery drain. Android doesn't seem to do a great job of keeping apps that aren't being used from keeping the phone/tablet awake or otherwise burning through battery once they've been used a few times. I came across that because the Nexus 10 was pretty rapidly draining the battery, even when going unused for days at a time with WiFi off.
Even making it run a check once every 2 min would still save battery life. If you absolutely have to know the instant an email comes in, this doesn't seem like the phone for you.
The one thing that struck me most about the 5 is its weight relative to the 4/4s. It doesn't seem to get as hot when it's busy, either, although I've only been able to make it heat up appreciably when doing Stupid Jailbreak Shit to it so far. Under normal circumstances, it seems to behave a lot better than the 4s.
When Maps is using the most battery, it usually means Location Services are enabled. Disabling location services in both the main Settings menu and through Google Maps should help you out.
