I've just got a hand-me-down 35mm film camera, a Minolta Maxxum StSi date model (also sold as the Maxxum 404si DATE). It takes two CR2 batteries for power, which I just bought fresh and new (Duracell with an expiry somewhere in 2016). I inserted them into the camera and shot a roll of 36 exposures. The battery indicator started blinking low about half way through the roll. I finished the roll of film, put a new one in along with some older, but known to work, batteries. Had exactly the same problem. Later re-inserting the batteries seems to have got me back to a full indicator again, but I'm worried. Anyone know what's causing this?