I would take a spare battery!
Although these things are supposed to last for a long while, there are times where I know I'll be gone from home for 2+ weeks, and having that little bit of insurance would be great, especially for that price.
I have an order in already (#284), so should I contact NAEB directly, or would that be something that could be added to my order. If it causes a delay, though, don't worry about it
Thanks!