Alright, so what life time can one expect as a customer? And economically speaking, how expensive will a battery swap be? The whole reason I'm asking is this 2

Alright, so what life time can one expect as a customer? And economically speaking, how expensive will a battery swap be? The whole reason I'm asking is this 20 year old skateboard I have down the hallway, which is working flawlessly with every single component easily swappable :-/