Hi folks, I've a MZ-RH10 with exactly the same problem as chippyricky is reporting - the unit works fine using the power adaptor but the battery is completely dead and won't seem to charge. Thinking the battery was at fault, I bought a geniune new sony battery but it's made no difference so it's obviously not the battery at fault. I've tried cleaning the contacts to no avail. I have, however, noticed the following:- - when you hit "charge" I get a VERY brief flash of 'charging' then it goes blank and doesn't charge when using the mains power adaptor - plug it into USB of my computer (to try and charge) I got "charging" for about 5 seconds - the battery icon indicates it's filling up, then the battery indicator shows full but then flashes on and off. Take it off USB and the unit works for about 3 seconds then completely dies. Anyone got any more ideas? (very frustrating!) Chris.