Optima BT DCM 5.5 Blue Top Deep Cycle Marine Battery Type: Sealed Lead Acid - Spiralcell Capacity (EN) Ah: 75 Nominal Voltage V: 12 Cold Cranking Amps (EN) CCA: 975 Reserve Capacity (BCI) min: 155 Weight Kg: 26.5 approx Length mm: 317 Length Top Cover mm: 325 Width mm: 158 Width Top Cover mm: 165 Height Excluding Terminals mm: 218 Height Including Terminals mm: 238 Extreme Vibration Resistance: Yes Fast Recharge: Yes Optima Spiralcell batteries are the optimum lead acid battery. Alternator: 13.8 to 15 volts. Battery charger 13.8 to 15 volts, 10 amps, 12-15 hours approx. Float charge 13.2 to 13.8 volts, 1 amp maximum current (All assuming a room temperature of 25 degrees C). All measurements are approximate.