Ran out of battery about halfway through a roll of 36; I removed the dead batteries but wasn’t able to replace them for a few days. When I finally put in the new ones, lo and behold the film counter was automagically set to 22 which seemed right to me. My question is what is the technology that allows that magic to occur? As far as I know there isn’t an underlying mechanical counter — or is there? Inquiring minds want to know…