Ciberhaguen, Your player must be turned on for the player to recharge. The green light on your charger means that the player is charging, when the player is fully charged the green light will go off or flash. If you are charging from the USB it may take up to 4-6 hours to fully charge your battery.

Thats weird if it has to be green, when I charge mine the light is always red I have never seen it green, and this is when there is barely any battery life, but it charges it fine

huskers_75
I have 3 chargers and they both have green and red led's, the only difference is on 2 the green light goes out when charged and on the 3rd it flashes. But I am sure there are others nothing about these players seems to be universal.