Thats about all you will get in them with your alternator but FULLY charged they are 13.1v as are most AGM's
Yellow top specs;
Performance Data
Cold Cranking Amps: 450 Cranking Amps: 575 Nominal Voltage: 12 volts,
Open Circuit Voltage (fully charged): 13.1 volts Internal Resistance (fully charged): 0.0046 ohms Capacity: 38 Ah (C/20) Reserve Capacity: BCI: 66 minutes (25 amp discharge, 80°F (26.7°C ), to 10.5 volts cutoff)
Red top specs;
Performance Data
Cold Cranking Amps: 800 Cranking Amps: 1000 Nominal Voltage: 12 volts, Open Circuit Voltage (fully charged): 12.8 volts Internal Resistance (fully charged): 0.0030 ohms Capacity: 50 Ah (C/20) Reserve Capacity: BCI: 100 minutes (25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off)
Cheers,
Paul.

