What if it starts to degrade over time? Any way for users to replace batteries, or maybe have a second battery to swap in?

I don't know if it's the kind of battery that tends to degrade over time or not.

As far as what's involved in swapping the battery, I have the knowledge to answer the question, but I don't know if that's something I'm allowed to discuss or not. I'm trying to be as careful as I can with not saying stuff that's NDA.