LR44 1. 5V Battery is a 1. 5 volt alkaline button cell battery designed for general use. The LR44 1. 5V Battery is widely used in watches, calculators and medical devices. A button cell battery is a small, round battery that is 11. 6mm(0. 457 inch) in diameter and 5. 4mm(0. 21 inch) thick. An alkaline battery is a battery that uses manganese dioxide and zinc to create a reaction, and it is an economical alternative to silver oxide batteries, while still providing high capacity and long usage. The LR44 1. 5V Battery is a primary cell battery, and it is non-rechargeable.