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The battery could be dead. The LIP-4WM batteries are ungodly expensive ~$100 but there is a thread with a take apart fix with a generic core battery on ebay. If it is one of the double ended gumstick batteries, the replacements are relatively inexpensive ($15 - 20) on amazon or ebay. From some quick googling it looks like it takes the cheap gumstick ones which might be worth replacing. Personally I'd try to sand slightly the blue off so it is bare rough metal with emory cloth and slightly bend the tab so I know it is making contact. Other steps to try - Do you have LIP-4WM battery or the other gumstick where it has a contact on both ends? On the LIP-4WM battery both contacts positive/negative are on one side, which is the side inside the player. For that battery you can lightly sand with some emory cloth (like sandpaper but no sand) to rough up the contacts on the battery itself. If that is the other gumstick where it has the contacts on both sides, you can sand down that blue spot with emory cloth as well making sure that metal is touching metal. You can also do that to the battery contacts itself.