My 4530s battery seems to near the end of its life. I found all the spare parts for the HP batteries but they are quit expensive and perhaps old stock by now. I tried two cheap batteries from China (really cheap so worth the risk). One was a 9 cell that started great but gave me only an hour after a few months. Now on a cheap 6 cell which is ok but nothing special. There are many different makes and models of batteries available for this laptop, I wonder if anyone was succesful with a cheap brand before I shell out full cash for the real one.