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Deep Cycle refers to applications that typically discharge 60 to 70% or more of the battery capacity. An automotive battery is an "SLI" battery (Starting, Lighting & Ignition.) Its plates are designed to deliver maximum power for a short duration. Starting an engine typically discharges an SLI battery 3% or less. When an SLI battery is used in a deep-cycle application or in a vehicle with heavy accessory loads, the battery life will be shortened proportionally to how deeply and frequently it is discharged. A properly sized deep cycle battery will work well as an automotive starting "SLI" battery to provide current for starting, ignition and lighting, as well as providing current for deep-cycle needs such as car audio, auxiliary lighting, winching, portable power, etc.

The OPTIMA Deep Cycle battery uses a different chemistry for the plates' active paste material, and a slightly stronger acid. This chemistry allows for a much longer life in deep cycle applications with only a slight reduction in maximum power output.

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