HITACHI DVD Video Camcorder In Case With All Contents

I found this amongst a box of books I wanted. Looks to be very tidy but seems to need a new battery as isn't holding charge. Also not sure if it's a DZ-GX5100E or the 5060E - document mentions both but I can't find a number on the camera. There are 4 discs with it (2 still sealed) I haven't managed to open the disc door on the camera - not sure if I'm doing something wrong or if it really is stuck

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