That's very interesting. I didn't know that it was possible to fly 2 more minutes with a 0% battery level and I also thought that it was recommended to land around 15% to preserve the battery life. I might change my habits then.
I didn't know...
Oh yeah I forgot to mention that the battery must be fully charged so let's say between 100% to around 15 % which seems to be a value around which the most of us land. (It can be more or less than that but then it should be notified in comment)...