Droid Eris battery not charging

It's not the battery life, or charging too slowly that i am concerned about... however, just starting yesterday(got the phone in Feb), my battery is low, and i plug it in... i know the port is working because it turns green that it is plugged in to power.... BUT the battery is still not
"charging" as soon as i unplug it we are right back to dead!! Had it plugged in for HOURS... and it is still plugged in now... any hints on something I could try?! LOVE my ERIS!!! Just need help.