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INDUSTRIAL  
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 80F (26.7C) before falling below 10.5 volts (6 cells X 1.75v)  
 
RC:
Reserve Capacity - The amount of time a bettery can last without charge
 
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