There's a seller called DMC-Batteries on ebay based in the UK. Have ordered and installed said battery and its working a treat. The total cost including shipping was approx €21. Took ages to arrive but money well spent. I was getting around 4 hours from my player and this has now solved the problem. Just follow the instructions for removing the battery as above. When you have removed the four screws from the little "tray" that holds the battery, pull the cord to remove it. Then slide a knife, screwdriver or other object behind the battery to remove it - its been stuck into place. The reason for this is that you dont want to be pressing on the harddrive (which is directly underneeth the silver "tray". Then attach the new battery connector and screw the tray back into place. Pop the battery into the tray (no need to glue it stays in firm enough) and then put the rear cover on.