What are the ends of a battery called where a circuit connects?

The ends of a battery where a circuit connects are referred to as terminals. Each terminal serves as a connection point for an external circuit, allowing electrical current to flow in or out of the battery. Terminals are typically marked, with one terminal usually labeled as positive and the other as negative, which is crucial for correctly connecting the battery in a circuit. This designation helps ensure that devices operate correctly and safely, as reversing the connections can lead to malfunction or damage.

The other terms do not accurately describe the ends of a battery in the context of electrical circuits. For example, connectors may refer to various types of connections in electronic devices. Leads often denote wires attached to components, while interfaces generally refer to points of interaction between systems or devices, rather than specific points on a battery. Therefore, "terminals" is the precise terminology used in electrical contexts regarding batteries.