LR44 Batteries are the most common of button cell batteries. All LR44 cells have a standard voltage of 1.5V, and size of 11.6mm in diameter by 5.4mm in height. LR44 button cells are used in hand-held electronic toys, calculators, LED lights, and just about every other place that a small amount of electricity is required at a low cost. In low-drain applications such as watches or calculators.