Terminated: unknown
Some of the differences. This one has a 10 digit accuracy and uses two separate digits for the exponent. It also includes hexadecimal, binary and octal operating modes. Complex functions are also included. At least I suspect they are, there is a "CPLX"-mode but I haven’t been able to figure out how that works. I still got an error on √-9.
Changing batteries is a little bit tricky. The batteries should be placed under the foil instead of the other way around.