Ten cells connected in 2 groups of 5 cells in series providing 2 nominal 12V sections at the connector. These sections can be connected in series (for 24 volts) in parallel (for 12 volts) or used as two separate 12- volt units with a Typical OCV: 15.0 or 30.0 volts Nominal (500 ma): 13.5 or 27.