The GP LR54 189 Watch Batteries are high-quality 1.5V alkaline coin cell batteries with the longest expiry date, making them ideal for use in a variety of devices. Manufactured by GP Battery, these batteries have a zinc manganese dioxide chemical composition and are non-rechargeable. With a coin cell diameter of 11.6mm and thickness of 3.1mm, these batteries are suitable for both high and low drain devices, and have an operating temperature range of 0°C to 45°C. The batteries come in various quantities from 2 to 20, and are designed for applications in sound and vision devices.