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Hi...as per my knowledge RC is measured in minutes @ 25A power draw, so 120 means the batteries will be completely dead (10.5v) after two hours of use with a steady 25A load. In practice a typical marine/RV battery would be somewhat damaged if you actually ran it down to 10.5v, but RC is a laboratory measure. RC and AH are used for battery comparison, not estimates of practical run time.

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