To fire automatically, you do, but the Vulcan can fire single-shot and does not need batteries to do so.
yes
you need 2
Most Nerf dart blasters do not need any form of electricity as they are spring-loaded, pull-back-and-fire mechanism. For those that do require batteries, usually those will be something that are motorized (such as the Stampede and Vulcan).
the rapid fire 20
i am pretty sure it only takes a couple of AA batteries i am definitely sure you dont need D sized batteries like vulcan and stampede
It can, but you will need a alternate mechanism to run the automatic loading and firing of the darts that will run without power.
you dont need batteries but if you put them in and fire the glow-in-the-dark darts the whole barrel will flash a white light
You need 4 D's. I know that sounds like a Rip-off, but it totally keeps working for a long time.
No, the Barrel Break IX-2 does not need batteries.
Yes, the Nitron requires 6 C batteries in order to fire disks.
yes
no