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Silver Oxide and Alkaline batteries are commonly used in watches, clocks, timers, calculators, laser pointers, toys, and LED "blinkies." IEC batteries that meet the international IEC 60086-3 standards for watch batteries carry a "W" suffix.
Cell types that have an SR prefix use silver oxide chemistry and provide 1.55 volts. Cell types that have an LR prefix use alkaline chemistry and provide 1.5 volts. The functional difference between silver oxide and alkaline are:
The most common name for the collection below is SR66. However, they are also called AG4, SG4, LR66, 177, 376, 377, and SR626SW batteries. All have dimensions of 6.8 mm diameter and 2.6 mm height. The alkaline varieties have mAh from 12-18 and the silver oxide varieties have mAh of 26.
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