<Tr> <Th_colspan="2"> Calculator </Th> </Tr> <Tr> <Th> Entry mode </Th> <Td> Algebraic Operating System </Td> </Tr> <Tr> <Th_colspan="2"> CPU </Th> </Tr> <Tr> <Th> Processor </Th> <Td> Zilog eZ80 </Td> </Tr>

What kind of batteries do graphing calculators use