<Table> Battery <Tr> <Td_colspan="2"> Various cells and batteries (top - left to bottom - right): two AA, one D, one handheld ham radio battery, two 9 - volt (PP3), two AAA, one C, one camcorder battery, one cordless phone battery </Td> </Tr> <Tr> <Th> Type </Th> <Td> Power source </Td> </Tr> <Tr> <Th> Working principle </Th> <Td> Electrochemical reactions, Electromotive force </Td> </Tr> <Tr> <Th> First production </Th> <Td> 1800s </Td> </Tr> <Tr> <Th_colspan="2"> Electronic symbol </Th> </Tr> <Tr> <Td_colspan="2"> The symbol for a battery in a circuit diagram . It originated as a schematic drawing of the earliest type of battery, a voltaic pile . </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Various cells and batteries (top - left to bottom - right): two AA, one D, one handheld ham radio battery, two 9 - volt (PP3), two AAA, one C, one camcorder battery, one cordless phone battery </Td> </Tr> <Tr> <Th> Type </Th> <Td> Power source </Td> </Tr>

What does the voltage of a battery depend on