I carry a spare battery in the car, one in my laptop case, a car charger, a charger at work and one at home. I run the screen at 100% brightness all the time due to eyesight issues. Have never run dry but I always have a backup plan.
Went on a GPS caching outing with some friends for an entire day in TX sunlight. The screen was surprisingly easy to read but not with polarized shades on. Yes, I had to change to my 3rd battery by the time we were done but it was at 60% when I got back to the car. Took photos and video and listened to podcasts throughout the day with Bluetooth headphones. Hooked it up to the car charger and was back to 100% by the time we got to the bar 1/2 hour later and spent a couple of hours showing off pix and vids while there. Just be prepared and you won't be disappointed.
I also used a golf GPS app for 18 holes and made it through the round on one battery but it was close. I was getting <20% warnings by the time I got back to the clubhouse. By the time I had downed my first cold one I had swapped out batteries and all was well. I could catch up on all the crap people had been trying to throw my way while I ignored them for 5 hours of ME time.
I got a deal from Amazon for 2 spare stock batteries plus AC charger that charges batteries outside the phone for $30 2 months ago. I didn't get the oversize battery because I had already shelled out for a case that won't work with it and neither will my vent mount in my car which won't accommodate the whale-tail battery cover.
You do what you have to do to keep these bad boys running gang. I find swapping out a battery or hitting the chargers whenever I'm in range of them to be a small price to pay for the amazing power of this phone.