Casio FX-9750G PLUS User's Manual & Technical Reference page 461

(Should a battery leak, clean out the battery compartment of the calculator
immediately, taking care to avoid letting the battery fluid come into direct
contact with your skin.)
Keep batteries out of the reach of small children. If swallowed, consult with a
physician immediately.
u u u u u To replace the main power supply batteries
* Never remove the main power supply and the memory back up batteries
from the calculator at the same time.
* Never turn on the calculator while the main power supply batteries are
removed or not loaded correctly. Doing so can cause memory data to be
deleted and malfunction of the calculator. If mishandling of batteries causes
such problems, correctly load batteries and then perform the RESET
operation to resume normal operation.
* Be sure to replace all four batteries with new ones.
1. Press !O to turn off the calculator.
Warning!
* Be sure to turn the calculator off before replacing batteries. Replacing
batteries with power on will cause data in memory to be deleted.
2. Making sure that you do not accidently press the o key, attach the case to
the calculator and then turn it over.
3. Remove the back cover from the calculator by
pulling with your finger at the point marked 1.
4. Remove the four old batteries.
5. Load a new set of four batteries, making sure that
their positive (+) and negative (–) ends are facing in
the proper directions.
6. Replace the back cover.
7. Turn the calculator front side up and remove its case.
Next, press o to turn on power.
Appendix B
Power Supply
BACK UP
433