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We substituted this lighter Optima D51 battery for our normal Yellow Top Optima and shaved 16 pounds. Despite its small size, the D51 cranks, as we noted in the Aug. '09 issue (Speed Shop, "We Test It"). Note that the battery is still mounted up front. We didn't want to add the 10 pounds of battery cable necessary to string cable from the rear even though that would help traction.