Well it's been a year since the last post and this wasn't resolved, so I have dug mine out of a cupboard and taken it apart. The battery was completely flat and wouldn't charge. So far I have de-soldered the battery and discharged/charged it with a professional battery charger. The battery is full @ 4.2V and took 342mAh of charge out of it's claimed 400mAh, no not too bad. Will update ones put back together.