DaveO wrote:
Great, but can he take the battery out of the camera and not lose date and time?
As stated several times previously... Yes, certainly.
All cameras have a separate built-in battery for time/date. Older models typicallyally had a user-replaceable battery, much like those used in watches, computers, etc. Newer models often use similar size, rechargeable time/date batteries that's not user-replaceable. It's built-in, recharges from the main battery whenever that's installed, and serves to back up settings, maintain the date/time, etc. while the main battery is removed.
If it were me, I'd carry on the camera gear and leave the batteries in the camera until actually asked to remove them.
I've NEVER been asked to remove batteries from a camera.
In fact, I've had TSA ask me to turn on the camera (or computer or whatever... any electronic device), to confirm it's functional and real. If the battery has been removed, it will mean fumbling around to reinstall it to be able to turn the camera on.
Besides, what are you going to do with the battery after it's removed? If it's in a pocket or bouncing around loose in a camera bag, that would be a lot riskier than simply leaving it in the camera.
In fact, I've had to explain the extra batteries I always carry (usually in pockets in a photo best I'm wearing).
Never, ever check camera gear. Even if it isn't stolen, it will very likely be smashed and broken. If you aren't able to carry on the gear for some reason, best bet is to box it up safely and ship it ahead to your destination. Most hotels will be happy to hold it for you until you arrive. If you do this far enough in advance you can even confirm it's safe arrival before you leave. I don't do it any more, but in the past sometimes had to travel with 80+ lb. of lighting equipment (carried on cameras, lenses & small accessories in a backpack that fits in an overhead bin and/or in the photo vest I was wearing).