I currently own a Polaroid 250 that I converted to use 3 Type N batteries courtesy of the cameramaker's archives. That was of great help, but the same article to convert a Polaroid 350 seemed somewhat useful. I've heard of using a 9v alkaline battery to repower the 350's ( also the 103, 104, 125, 135, 210, 215, 315, 320, 330, 420, 430, 440, M60, and Countdown 70. The 335, 350, 360, 450, M80, and Countdown 90 use two No. 532 batteries for the timer). Is there someone on the list who has done this conversion? And why 9v? In series wouldn't the camera  use 6v? Is the extra voltage for better shutter release? Thank you greatly.
 
Edward

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