Brand new i-pod shuffle charging problem

Hi There

Can anyone explain why my new shuffle will not charge.

When it is charging through the usb port all it does is show an orange light blinking for hours and hours.

When its removed from the dock and I switch it on the green light is illuminated for about 3 seconds before going out.

I am assuming it could have a faulty battery, and if it is charged correctly does the green light stay on continiously?

Many thanks for your help.