Has anyone had this problem and found a solution...I have a dell inspiron 1545 , vista o.s., with the original ac adapter. I replaced the battery with a less expensive one as the computer told me my battery life was ending. It worked great for a while, bet then it starts this thing about battery plugged in and not charging. It will go down to 0% charge and every once in a while it will fully charge, but not very often. What causes this. My adapter cord has a chip in the plastic edge so its easy to deplete the charge which really sucks when you bump it during something important and the info gets lost by power-loss. My question is why does it only charge every great once in a while and not all the time like it should.