I have a MZ-E40 player. Where can I get a rechargeable Ni-MH BP-M20 battery pack? I also have an MDS-JE510 record playback deck - sometimes when ejecting a minidisc it will not eject all the way. Any ideas on fixing it? I did take some electronic cleaning solution, put it on a Q Tip, and cleaned inside the eject door and inside the disc slot. That seemed to work.