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:
SR48 silver oxide batteries can be used to replace the following:AG5/SG5, LR48, L750, and 193/309/393 batteries. All have dimensions of 7.9 mm diameter and 5.4 mm height. The alkaline varieties have an mAh of 52 and the silver oxide varieties have an mAh of 70.