When I replaced Mamiya 7II with a Duracell A544, which indicates that it is the equivalent of 4LR44, the camara ceased to function. As I was shooting with light snow falling, I thought I fried Mamiya's electronics. I was about to send the camera to Mamiya for repairs, I fortunately found a spare 4LR44 battery at home. Replaced the battery with this one ---- wala it worked. Just an fyi for folks using Mamiya cameras requiring 4LR44.