Sharp EL-9900 Operation Manual page 240

Appendix
230
1. Perform procedures 1 and 2, as shown above. Do not remove
the unit operation batteries.
2. Remove the screw and the
lithium battery cover, as
shown.
3. Use a pen to lift the lithium
battery out of the battery
compartment.
4. Insert the new battery with
+
the PLUS ( ) side facing up.
5. Replace the lithium battery
cover and fasten the screw.
6. Replace the battery compartment cover and press O.
The following message will appear.
7. Press O.
Do not press C C . This C C C
will clear all the data.