I have read varying responses on the web to the question of a\nreplacement battery for the Pentax Spotmatic SPII light meter.\nRecently got one of these cameras, sans battery, and tried a Energizer\nSilver Oxide #392 per some suggestions. Although it's not an exact\nfit, it is the right width, and fit fine. I compared it to another\ncamera's meter readings, and it seems right on, although I didn't\nshoot film yet to see about the exposure. The voltage of the 392 is\n1.55, which is higher than the original mercury 1.3, but I have read\nsome entries saying the Spotmatic has a "bridge circuit" with the\nlight meter, which corrects for voltage discrepancies, etc. Any\nthoughts on this? I could get a Wein Cell, but I have heard that they\nhave a very limited life, and are more expensive and less available\nthan Energizer Silver Oxide Watch/Electronic batteries. Thanks!