This is probably a stupid question, but I can't find the answer anywhere on the internet. I have "free supercharging for life" on my 2017 Model X. Does this mean I can ONLY use superchargers or can I use ANY Tesla charger? An apartment building I'm thinking of moving to has Tesla (slow) chargers and I'm wondering if those will be free for me. Or when Tesla says free "Supercharging" for life, do they actually mean I can only use actual "Superchargers" for free, but the slower Tesla chargers will cost me money to use them?