Are you using a mains charger, Cerridwyn? The Sony doesn't charge at all well from a PC or laptop and the battery level meter shown on the device is notoriously over-optimistic.
I got a mains charger on advice from here (maybe from Dreams) a couple of years ago when I was having no end of trouble with my 505. It's performed perfectly ever since. I use it heavily and never let the meter run below three bars, but a single charge every two or three weeks tops it up just dandy.
Good luck. Neil
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