Marine Cranking Amps - The amount of amps a battery can produce
at 32°F. Cold Cranking Amps - The number of amps a battery can
deliver for 30 seconds at 0°F and maintain 7.2 volts. The amount
of minutes a battery can be discharged to 10.5 volts by 25-amp
discharge at 80°F. Amp Hour (Ah or ah): A unit of measure for a
battery’s storage capacity obtained by the amount of amps a
battery can be discharged (typically 1.75vpc) multiplied by the
amount of hours @ 80F (26.7C) . Most auto/marine and light truck
batteries are tested at a 20-hour discharge rate. Example: A
12-volt 100ah rated marine battery means that 5 amps can be
discharged for 20 hours at 80°F (26.7C) before falling below
10.5 volts (6 cells X 1.75v)