Reading Using the Location Sensor might help you understand how the LocationSensor works.
This can be done using the ActivityStarter. Here is an example that finds a particular store ...
How to search for nearest store - #7 by SteveJG . The code will find 'car charging stations near me' by substituting those words for 'Walmart near me' that are in the example code. 
Does it work for you?
Here is an api for USA vehicle charging stations Nearest Stations API | NREL: Developer Network