The LR44 and the 357 are the same size battery the only difference is the LR44 is an alkaline battery and the 357 is silver oxide battery. They can be used interchangeably. I tend to stay away from alkaline batteries on cameras with analog light meters because of the battery discharge curve. the voltage of Alkaline batteries taper off as as they drain eventually causing inaccurate light meter readings as the battery ages. Silver oxide and lithium batteries are better suited, they have a flatter discharge curve, meaning they maintain their rated voltage for a longer period, in some cases right up to the point the battery becomes exhausted. Hope this helps.