:lol: the lm323 is a voltage regulator, not a battery, the battery is just inside the little square metal box that appears on your general triaxis photo, you must to unscrew and leave the metal box, you could see the cr2032, classical calculators cells, just replace it with a newer cell, beware, replacing the cell will lost all your data.
and op amp is an operational amp, an IC integrated circuit, their functions is general amplify signals. as I said a op amp is an IC it means that inside it there is a completely circuit designed for the purposes of amplify signals, for example.
Inside it there is a circuit with micro elements like transistors, diodes, caps etc... they are very small and for that reason you could get a lot of power from op amps, in the best of the cases they could achieve a +/- 18 volts outputs ( with a +/- 20 power supply ) and an output current of 40 mA
You can´t install an autocharger cell inside some equipments, because unless the battery is made from lithio-ion the cell will sulfate as years go by. If your cell sulfate means that the metal elements for example niquel is spilled over nearest elements, the cell on triaxis is just together the z80 cpu if the niquel spills over the z80 cpu said bye bye to your triaxis
hope it was helpul