The 357 and SR44 are equivalent and both are silver oxide batteries. The alkaline version is LR44. According to Energizer (who doesn't make SR44 and claim that the 357 is their equivalent) the 357 has a bit less mAH rating than their EPX76 silver oxide. The voltage curve of the EPX76 is also a bit flatter than the 357. The A76 (alkaline) has about the same voltage curve as the 357 and the same mAH rating. If you can name names (i.e. camera make and model as well as battery make and model) then we can possibly find out more about the problem.