Thanks!
I have a Vision Spinner, but don't keep it charged so not that good for a backup.
I'd get another SID, but the one I have is 2 months old and the fire button is already flaky.
I'll definitely get one of those cool looking Vaultz cases for travel.
The extra charger I hadn't considered, but, gotta have reliability. OTOH Amazon has next day delivery and I do have charged extra batteries.