What does 12V 100Ah battery mean? 12V 100Ah battery: It means the capacity of the battery is 100AH and the discharge voltage of the battery is 12V. Definition of 12V 100Ah battery parameters: The nominal capacity of small storage batteries is measured in mA-h, while the nominal capacity of large storage batteries is measured in A-h, kA-h. The telecommunications industry often takes the nominal...