How to Identify What Type of Battery You Have? Figure 3.1.2 Let's take the following picture as an example: Manufacturers Part No. Battery Type Figure 3.2.1 1) Battery Capacity: 80Ah Battery Capacity is defined as the total amount of electricity generated in the battery in a certain time, and is measured in ampere hours (Ah). 2) Voltage: 12V When fully charged, automotive batteries should measure at 12.6 volts. However, this measurement should be from 13.7 to 14.7 volts when the engine is running. If the battery tester EN I 10 AGM 650 E51 80Ah 12v A (SAE) Battery Capacity Voltage CCA in USA Battery Capacity CCA in USA