How to judge the 808d usb charger good or bad?

The Led lamp of 808D usb charger have four status.  You can judge according to the state of the lamp is good or bad.

1, Green light,   it means Full charged  or  No connect to 808D battery， Please see the following picture

2.  Red light, It means the 808d battery is charging.

3.  Between the Green light and Red light,   it means the 808d battery will be full.   the red light will be converted to a green light after 10-20 minutes.

4. light off,   No current input or short circuit protection or bad.