What is a notable characteristic of primary batteries?

Primary batteries are specifically designed for single-use applications, which means they cannot be recharged and reused once they are depleted. This characteristic stems from their chemical design, which results in irreversible electrochemical reactions that occur during discharge. Once the reactants in the primary battery have been converted into products, they cannot be restored to their original state by applying an external electrical charge, which distinguishes them from secondary batteries that can be recharged.

In terms of functionality, primary batteries are often used in devices that require a long shelf life, such as remote controls, smoke detectors, and certain medical devices, where it may not be practical to recharge the battery regularly. Understanding the nature of primary versus secondary batteries helps inform choices about which type to use in various applications based on energy needs and usage patterns.