What is a lifepo4 battery? A lifepo4 battery is a series of cells with different voltages. Each cell has a nominal voltage of 3.2 volts and a maximum voltage of 3.65 volts. Lifepo4 batteries are made up of a number of serially connected cells. There are three common configurations of lifepo4 batteries, namely 4s, 8s and 16s, with nominal voltages of 12.8, 25.6, and 58.4 volts, respectively.