Hi CessnaPilot80,
You can find the online battery manual by clicking Support / Battery Manual.  Here is a shortcut: http://ifly.adventurepilot.com/portal...
 
This will explain the lights.  Charging time will vary.  Your first charge might take a few hours.  Subsequent charges will be faster.  And of course it depends on how discharged the battery is to start with.  You should charge until you have 4 solid green lights when pushing the button.  The battery will not overcharge, so it's okay to leave it pluged into the AC adapter if that's easier.
-Walter