Silver oxide battery

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Silver oxide battery

Silver oxide cells
Specific energy	130 Wh/kg[1]
Energy density	500 Wh/L[1]
Specific power	High
Charge/discharge efficiency	N/A
Energy/consumer-price	Low
Time durability	High
Cycle durability	N/A
Nominal cell voltage	1.55V

A silver oxide battery (IEC code: S) is a primary cell using silver oxide as the cathode material and zinc for the anode. These cells maintain a nearly constant nominal voltage during discharge until fully depleted.^[2] They are available in small sizes as button cells, where the amount of silver used is minimal and not a prohibitively expensive contributor to the overall product cost.

Silver oxide primary batteries account for 30% of all primary battery sales in Japan (64 out of 212 million in February 2020).^[3]

Large silver oxide batteries were used on early ICBM's and satellites because of their high energy-to-weight ratio. For example the Corona reconnaissance satellites used them, as did the Agena-D rocket upper stage.^[4] Later, they were also used in the Apollo Lunar Module and lunar rover.^[5][6]