What characteristic defines a dry cell battery?

A dry cell battery is characterized by being portable and compact. This is significant because dry cell batteries are designed for convenience and ease of use, allowing them to be used in a wide variety of portable devices, such as flashlights, remote controls, and portable radios. Their compact size makes them easy to transport and integrate into electronic devices that require a reliable power source.

In addition, dry cell batteries typically utilize a paste-like electrolyte, which differentiates them from wet cell batteries that contain a liquid electrolyte. This paste helps prevent leaks and contributes to the portability that defines dry cell batteries. While they do generate energy through chemical reactions, and some are used in vehicles, the defining characteristic with respect to their common applications and usability lies in their portable and compact nature.