One point I would pass along pertains to packing. You didn't mention the type of shaft your Excal has but I can tell you from experience that a travel shaft, either 3 or 4 piece, packs extremely well and you can fit the entire unit in a normal size suitcase or backpack. Having said that, the battery, as Treasure Hunter advised, should be in your carry on. With my O/U travel shaft (by Plugger), I can fit the entire Excal in a carry on size back pack. Am I pushing the limits of carry on? Perhaps, but I like the idea of having that machine with me at all times.
Now what about your scoop and or digging tools? That must be checked. I have a break down travel scoop by RTG that answers the travel call.
As Treasure Hunter said, if you have a hard side golf case, that also works for everything...and hides what's really inside.
I would also carry the user manual so you can show the TSA what this electronic device is if they question you.