E-tron Battery Zero percent survival

[vxo13]

I was driving in my E-tron when suddenly it's Zero percent battery! My fault I wasn't paying attention to it. I managed to limp along for about 5km before finding a charger. I'm still shaking! Anyone else experienced this? How far can you really go on zero? And more importantly, did it damage my battery?

 

[AquaArrow]

This happened to us once during a rural trip. The gauge read zero, but the car kept going and never stopped until we found a station. Even though the gauge says empty, it appears that there's a lot of reserve in the battery range.