The LED light will turn green when the corresponding battery is fully charged. 

The LED light will turn green when there is no battery in the charger or when the battery is fully charged. The LED light will be red while the battery is charging. 

Step 1: Being careful not to touch the lens, cover the right objective lens (or close your right eye) and turn the central focusing dial until the image seen by the left eye is clear. Step 2: Cover the left lens (or close the left eye) and this time instead of turning the central focusing wheel, turn the diopter adjustment ring (located near the right eyepiece and displayed on the small image in the upper right) until the image is clear. Step 3: Finally look through the binoculars with both eyes until the image is clear and sharp. 

Yes 

pull back the lever and twist the adapter clockwise (from the back of the lens)