Mac air battery not charging

Mac air not charging, no orange or green lights but the indication on the screen showing being charged but the % not getting better than 38% despite charging it overnite. Help please

Perform SMC reset.
Have you been many times letting your Air die from power? (important question)
Run an SMC reset and report back
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
If you have no indicator lights on the magsafe charger, you have a possible defective charger OR a damaged/defective IO board.
If same after SMC reset, contact Apple for in shop full diagnostic and possible replacement of charger and / or IO board.

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