help me find out what's wrong

later tonight, i charge my battery (after drained).. then after 2 hours, i cheked if my battery had been charged.. something caught my attention, the light kept blinking like orange-orange-orang-green for 3seconds (if i'm not mistaken).. i tried plugging my other battery but the blinking was normal.. please help me figure out whats happening? my battery status was fully charged..no other problem than the blinking mode was like what i have stated earlier..

im an ispiron E1505 user.. is someone here experienced the same thing?thanks..