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The issue with 100% is mostly charging and leaving it charged this way. So charging to 100% and then starting a trip causes no issues. That is how Tesla taxis in Europe charge fast all the time and still get around 200k miles on the batteries. One nice feature on a Tesla is you can program it to get itself to 100% at a set time. So if you know you are leaving tomorrow at 8 am, it will hit 100% just prior to you leaving.
Stopping at 80% with a Tesla when fast charging is simply that the car will slow the charging rate to prevent heat build up. So you can charge to 100%, but it takes more than an extra 10 minutes to do it. Lots more. I also think Tesla on their newer design batteries say it is okay to drop all the way to 10% without hurting the battery. I normally won't drive until I only have 10% gasoline left in the tank so I wouldn't do that in an EV normally.
Stopping at 80% with a Tesla when fast charging is simply that the car will slow the charging rate to prevent heat build up. So you can charge to 100%, but it takes more than an extra 10 minutes to do it. Lots more. I also think Tesla on their newer design batteries say it is okay to drop all the way to 10% without hurting the battery. I normally won't drive until I only have 10% gasoline left in the tank so I wouldn't do that in an EV normally.