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"Optima D31M Blue Top, D31A Yellow Top and D31T Yellow Top Batteries:The D31 series is Optima's most powerful single-unit deep cycle battery. Like all Optima batteries, the D31 series deep cycle batteries offer exceptionally high CCA for their size and boast 75 amp hours of current storage for long deep-cycling run times. The D31 deep cycle batteries will not off-gas in normal operation"
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