Tesla does not leave any headroom. If they did, then the car would appear to be able to charge to its original value for a while -- but it doesn't: https://ele

Tesla does not leave any headroom. If they did, then the car would appear to be able to charge to its original value for a while -- but it doesn't: https://electrek.co/2016/11/01/tesla-battery-degradation/ https://electrek.co/2016/11/01/tesla-battery-degradation/ What Tesla does do is pretend that the bottom 20% of the battery doesn't exist. That's because it's very damaging to use it at low charge.