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The Tesla store has two mobile connectors. $275 & $520. I guess the $520 handles higher current, but it appears to have a permanently affixed plug. Is that true? Seems like it's not very useful that way (although usually sold out) if it can only connect to one type of plug that you often won't see on your trip. What is the max charging current for the cheaper connector that came with the car vs that one assuming the same plug & circuit?
Other than faster charging, is there any real advantage to the wall connector? My normal driving these days is low enough that the 115V in the garage has been sufficient but I'm thinking of getting at least a 240V line and plug installed. But it also seems like a smarter choice than the $520 connector just because it's $20 cheaper.
Bottom line is I assume I'm missing some stuff here. So what have I got wrong?