Hi Ron - no problem about the questions, except I don't have those answers! I know that we have plans to sell the accessories, but I have no idea about the cost. The USB cable is standard, so you can find it anywhere. The battery is a standard Li-Ion polymer pack, so maybe you can find some typical lifespans and extrapolate from that? Sorry, not much help here....
I can tell you that we do not have a service center in BC, to my knowledge.