The LR41 button cell battery, also known as a 192 cell, is a small metallic battery typically used in watches, calculators and similar devices requiring a small and thin power source. Made with an alkaline chemistry, it is very similar to the SR-41 and 392 silver oxide batteries that have the same size and almost the same voltage.
The LR41 cell weighs approximately .5 gm and has a volume of 1/100 cc. It is a disc that is no more than 7.9 mm across and no more than 3.6 mm thick, including the slight protrusion of the anode on its underbelly.
Voltage and Amperage
The nominal voltage of the alkaline LR41 / 192 cell is 1.5 volts. It holds approximately 45 milliamp-hours of current, based on discharging it to a point where it can produce no more than 0.9 volts of power.
The life of an LR41 cell varies depending on how it is used. Given a constant drain of 0.083 milliamperes at 1.25 volts, it can last 542 hours before its power output drops to 0.9 volts. In heavy drain settings, its 45 milliamp-hour capacity rating indicates that it can deliver 45 milliamps of power over a period of one hour.
Silver Oxide Cell
The LR41 battery has a related cell with a silver oxide chemistry, the SR41 cell, also referred to as a 392 or 384 cell. This battery has a 44 milliamp-hour capacity and produces a nominal voltage of 1.55 volts. Unlike the alkaline cell, which gradually and relatively smoothly reduces its power output over its life, the SR41 produces almost its full voltage for the majority of its life then dies relatively quickly.