Which characteristic distinguishes deep-cycle batteries from starting batteries?

Deep-cycle batteries are specifically designed to provide sustained power over a longer period, making them ideal for applications where energy is drawn over extended intervals. This capacity enables them to be discharged significantly without damaging their lifespan, as they can handle repeated deep discharges. This feature is crucial in marine or RV applications where power is drawn for longer durations, such as running appliances or electronics when the engine is not running.

In contrast, starting batteries are built to deliver a high burst of energy for a short duration to start an engine, which is measured in cold cranking amps. While they provide high voltage under a heavy load momentarily, their design focuses on quick bursts rather than sustaining power over time. Therefore, the defining characteristic of a deep-cycle battery is its ability to handle repeated deep discharges reliably, distinguishing it from more transient power sources like starting batteries.