Very definitely get a spare battery. The run time on these is 30 minutes which is really very good but if you're out and about that can run down pretty quick. I've gotten used to being able to take off, get the shots I want and land again to conserve power but an hours combined flight time is generally enough. Return to home automatically on low power is a great feature. It knows how much battery life it needs to get back and auto adjusts.
I also got a carry case that now holds both batteries, drone, remote, 2 spare sets of props, filter set, dual battery charger and all needed cables!