Wein cells are the ideal replacement for discontinued mercury cells. The Wein cell delivers a stable 1.35V meaning no camera or meter adjustment required. Depending on camera useage the Wein cell can last about 10 months. Unactivated (blue pull tab intact) the Wein cell shelf life is several years. Suits many vintage cameras and light meters. Check your camera manual to ascertain the original battery requirement.

Wein cell MRB 625 zinc air 1.35V battery