Silver Oxide (SR) and Alkaline batteries (LR) are commonly used in watches, clocks, timers, calculators, laser pointers, toys, and LED "blinkies". Batteries that meet the IEC 60086-3 standards for watch batteries carry a "W" suffix. The functional differences between silver oxide and alkaline are:
SR55 silver oxide batteries can be used to replace the following:
AG8/SG8, LR55, 191/381/391, LR1120/SR1120 All have dimensions of 11.6 mm diameter and 2.1 mm height. The alkaline varieties have an mAh 40-42 and the silver oxide varieties have an mAh of 55-67.