I purchased a Yashicamat 124 (not "G") off of E-Bay recently. It's in great shape but it needed a battery. The manual said that it needed a 1.3v mercury battery which I understand is not being produced anymore. I went to the camera shop and the guy there put in what he said was a replacement for it, but now I'm not sure that it was. When he put the battery in the meter worked and we even double checked the exposure that it gave with another functional camera and it was dead-on correct. But just a few hours later the meter is not working. The packaging for the battery said it was a 1.5v battery. Can someone tell me what is the best replacement battery for my camera? Thanks in advance for your input.