I have a 2017 Model S 75D I think I would be interested in upgrading the battery to something with more capacity if possible. A quick check on the tesla.com website didn't reveal any options, but I've read here on the forums that owners have done something similar. Before I get busy with the phone, can anyone give me some idea of the basics? How long does it take from decision to 'come in and have it done' (lead time)? How long does it take to actually do the work? What are my options for increase in capacity? How much $? Assuming I like what I read here, what is my next step?