We have two of them in the woods right now. Never used them before. I need a little help though. I full yexpect when we go to the camp this coming weekend, the batteries will be dead in both of the cams. Whatever film has been used, we'll want to take in,even if we didn't use the whole role. I heard a few of you talking about there not being a manual rewind on it. Will I need to replace the batteries before I do anything else? Any help is appreciated. Thanks.