SR42 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:
SR42 batteries can be used to replace the following: SR1136SW, SR1136, V344, 242, SR42, 344, GP344, D344, 344A, 344X, 344/350. All have dimensions of 11.6 mm diameter 3.6 mm height, and a capacity of 105 mAh.