Reference Data:     12.6v = 1.265 = full charge
                    12.4v = 1.225 = 75% charge
                    Every 0.01v = 1.25% loss of charge
                    12.2v = 50% charge
                    11.8v = 1.120 =  0% charge
Battery Case Dimensions Note: As of 2017-10-30: Forward battery is The starting battery, #1 on the Guest/Marinco switch. Aft battery is the house battery, #2 on the Guest/Marinco switch.