MazdaBass971 Posted August 25, 2015 Report Share Posted August 25, 2015 Well i have two Optima yellowtop battery's and I don't really know what the RMS discharge number is for these battery's, is anyone good at calculating amp hour ratings to find out the RMS wattage these battery's can putout?Here are the specifications: Cold Cranking Amps: 620 Cranking Amps: 770 Nominal Voltage: 12 volts Open Circuit Voltage (fully charged): 13.1 volts Internal Resistance (fully charged): 0.003 ohms Capacity: 48 Ah (C/20) Reserve Capacity: BCI: 98 minutes (25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off) Thank you for any help. Link to comment Share on other sites More sharing options...
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