No green light on Mid 2011 13" MBA, continues to charge. Why is it not on? Could this be an issue with the SMC?
Please try the following to reset the charging options:


Shut down your Mac.
Unplug the MagSafe or USB-C power adapter from your computer.
Using the built-in keyboard, press Shift-Control-Option on the left side of the keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds.
Release all keys.
Reconnect the power adapter.
Press the power button again to turn on your Mac.