My thoughts on flying with gear:
1) Mail your questionables (batteries, etc...) to your destination. Either to someone you meet here or to your hotel. FedEx with tracking works great. Call your hotel and tell them you are going to send them a pax for you to pick up upon check-in.
2) Walk up with your bag open and everything easily accessible. Just like a laptop, expect to be asked to pull your stuff out. With that in mind, unhook cables, etc. and pack it away neatly in ziplocks. This makes for easy inspection of everything.
3) You have nothing to hide, be cool and cooperative. The Security people are just trying to do their jobs. Don't get bent, it'll only cause problems. Make sure that they know you are totally cool and that you just have a tape recorder and mics, etc... Kiss their ass if you have too, they can delay you or inconvenience you beyond belief...
YMMV,
Terry