First of all, good that you plugged it in immediately.
You have two gauges on the dashboard that would have given you plenty of advance warning:Fuel gauge
, on the left side of the instrument panel. It shows battery charge level in sixteen bar increments. One bar gives you roughly four miles of range.Range Remaining
, on the right side of the instrument panel. You need to push the little selector button until a number with a left-facing horizontal arrow under it shows up. This predicts the number of miles you can drive, based on battery charge level and how the car was driven for the past 15 miles (it's a 15-mile moving average). If your driving is consistent, it is a very reliable predictor.
In practice, I almost never let the charge level get below two bars, and almost never fully charge the car either. We can get into that later. In this case, fully fully charging the car all the way up to the top and letting it eventually turn itself off all in one unbroken charging cycle will actually be good as it will ensure that the individual cells will be balanced and it will perform an internal recalibration as well, as who knows how long the car has been sitting unused.
Hope you got a good night's sleep. What a traumatic start to your EV ownership.