[ePierre]

> The Dell power connector is a barrel style connector with an LED embedded in it. The LED appears to serve no useful purpose. It’s always on, whether connected or not and doesn’t change colour or turn off when charged.

I believe the only use for this LED is to know that the cable is actually plugged to the wall. It's probably useless for people who keep their charger plugged all the time, but it's very useful for me, a QA engineer with a testing table full of devices and cables, plugged and unplugged :)