For the Nexstar EP, 2 batteries are required for flight. The RTF comes with 2 batteries, which will get you 7 to 10 minutes of flying, then you need to recharge. To have the maximum amount of fun with this plane, it would require a bunch of extra batteries (4 to 6 total, unless you got 2 or 3 big lipo's) and a good charger.

Electric is more money up front. However, glow fuel adds up. Electric is clean and quiet, glow fuel is great if you like playing with engines.