Hi there, my name is Cameron & I’m a tech expert here with JustAnswer, an independent, paid support website. I know these kinds of things can be really frustrating and I’m sorry you have to deal with this, but I just came across your issue and want to help you as best as I possibly can to try and find a solution! Making sure we can find the best solution or steps forward for you here are my top priorities and I’m reviewing the information you’ve given me now!
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As I said above, I’m very sorry to hear about your issue. Unfortunately this issue is due to the design of this camera, because this camera requries a special key to open and unlock the base so that you can replace the battery.
If you click this 1st link below, you can see a visual image of what I'm referring to. The second link is a link to the manual for you! I'm not sure how you're going to be able to find one of these keys to unlock this, considering the age of the camera. But the best bet is to go to a local camera shop and ask them, they always know how to find things locally.