You cannot open any JVC camcorder without power, and if something happened (like camcorder being dropped etc) that caused the battery to fall out in the first place with it not working when replaced, then it possibly indicates that an internal fuse has blown.
The only method or retrieving a loaded tape is for the case to be separated and power applied from a 3 volt battery (2 X 1.5v in series) to the top of the loading motor and this will cause the tape to eject.
Unfortunately the info relating how to carry out that procedure can only be sent to a direct e-mail address and not pasted into a reply box for technical reasons. (If you require info click on my RED link and provide the e-mail address there, it not displayed on the web page)
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