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The 4SR44 / PX28S silver oxide batteries are an ideal replacement for the PX28 mercury battery. It not only has a higher power capacity than an alkaline battery, but it also has a much more stable discharge voltage over the life of the cell.

Advantages of Silver Oxide Battery over Alkaline Battery

• Higher Power Capacity (1.5X+ Power Density)
• Stable Voltage Output
• Superior Leakage Resistance
• Lower Self-discharge Rate
• Lower Internal Resistance (Perfect for film cameras that have incandescent lamps and magnetic shutters) 

Commonly used on:

Bronica GS-1 / Canon AE-1 / Minox 35ML / (Yashica Electro 35 with PX32 Adapter)