Samsung Galaxy S II, Epic 4G Touch

Over the last month my phone has started charging very slowly.....it will take 10-12 hours to get a full charge, and yesterday while i was traveling in the car, the car charger was plugged in and the charging icon was "running" showing it was charging but the red indicator light would not turn on and I never increased in battery life. I have had this phone since October, so will probably try to warranty it out, but was just wondering if anyone else has had similar issues?