How do I know when R2-D2 is fully charged?
When R2-D2 is low on battery he will flash red. To charge him, plug in your Droid using the USB charging cable. When you plug in R2-D2 you'll see the small light near his charging port turn orange. When he is done charging, this light will turn solid green. R2-D2 is now fully charged and ready for action!