Earlier this week I bought a Kodak KS-28 silver oxide battery at Unique Photo in NJ for $6.95. They had a less expensive alkaline battery but did not have any lithium batteries. I would have preferred the lithium battery if only for its long shelf life. I use the size in Canon A-1, Canon F-1N, Bronica ETR/SQ/GS-1 and Minox 35 EL cameras. It gets the most use in the Bronica cameras. I don't remember whether I have tried a lithium in the Bronicas. In cold weather a silver oxide battery should work better than an alkaline. If a remote battery pack for the Bronicas was not sold it should be possible to make one.