I had a similar problem with a SQ-Ai I bought ten years ago and it seemed like I couldn't use the camera for a whole day without changing batteries. I took it to the UK repairer who eventually diagnosed a complex electrical fault which involved a circuit board if I recall correctly. Anyway they cured the problem though I don't know how much it would have cost had it not been under a warranty from the selling dealer. I now get several hundred frames and about ten days use from a set of batteries if I use the metered prism, more without it.