I agree that a Bronica with an electronic shutter has accurate speeds and that the battery lasts a long time. Last summer I had a problem with the battery in a Mamiya M645 1000S which had a PD prism finder. I had to search around Cape May, NJ to find a PX28. Who had it? Radio Shack in North Cape May. Unfortunately they only had the alkaline battery but it worked and my photos with the 1000S wwre fine. For now my only medium format SLR which does not need a battery is a Mamiya RB67 Pro S. I have numerous other Bronica and Mamiya medium format cameras and they all need a battery to work.