Hello. My name is***** can help you with your question
Since these cameras are no longer manufactured, the cover can be difficult to come by. In fact any parts for this camera difficult to come by. What I would suggest doing though, is to find another nonworking camera – for example on eBay – and use that for the spare parts. It should cost very little to purchase a nonworking version of this model, but it will give you the part that you need and give you additional parts in case something else you need to fix the future. I don't believe you'll be able to find the battery door by itself for sale individually.