I hadn't thought about this either. I saw that suggestion while researching this question but I don't think there was much of an explanation why this would be true. I'm going to9 try and run this down a bit.
That's right but I suspect the OP is looking for something a bit more preemptive than that. The system will give you a notification but it's very easy to ignore/miss. I've done it several times. There seems to be some disagreement over whether the notification appears with 2% or 5% charge remaining.
@RadDave I like your idea of using the widget. I may give that a try.