<Table> Lithium - ion battery <Tr> <Td_colspan="2"> An example of a Nokia Li - ion battery (used in various mobile phones) </Td> </Tr> <Tr> <Th> Specific energy </Th> <Td> <P> 100--265 W h / kg </P> (0.36--0.875 MJ / kg) </Td> </Tr> <Tr> <Th> Energy density </Th> <Td> <P> 250--693 W h / L </P> (0.90--2.43 MJ / L) </Td> </Tr> <Tr> <Th> Specific power </Th> <Td> ~ 250 - ~ 340 W / kg </Td> </Tr> <Tr> <Th> Charge / discharge efficiency </Th> <Td> 80--90% </Td> </Tr> <Tr> <Th> Energy / consumer - price </Th> <Td> 3.6 W h / US $</Td> </Tr> <Tr> <Th> Self - discharge rate </Th> <Td> 2% per month </Td> </Tr> <Tr> <Th> Cycle durability </Th> <Td> <P> 400--1200 cycles </P> </Td> </Tr> <Tr> <Th> Nominal cell voltage </Th> <Td> NMC 3.6 / 3.85 V, LiFePO4 3.2 V </Td> </Tr> </Table> <Tr> <Td_colspan="2"> An example of a Nokia Li - ion battery (used in various mobile phones) </Td> </Tr>

What is the voltage of a single lithium ion cell