Optima YTSS 2.7 Yellow Top Dual Power Battery 8071-176 Type: Sealed Lead Acid - Spiral cell Capacity (EN) Ah: 41 Nominal Voltage V: 12 Cold Cranking Amps (EN) CCA: 510 Reserve Capacity (BCI) min: 70 Weight Kg: 11.6 approx Length mm: 228 Length Top Cover mm: 237 Width mm: 121 Width Top Cover mm: 129 Height Excluding Terminals mm: 201 Height Including Terminals mm: 227 Extreme Vibration Resistance: Yes Fast Recharge: Yes Optima Spiral cell 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.