Sharp EL-9900 - Manual (Page 239)

229
Appendix
Once every 5 years, the lithium battery will need to be replaced.
The lithium battery is used to maintain the memory of the
calculator.
Note: Do not remove the lithium battery while the unit operation
batteries are removed; otherwise all the calculator’s stored
memory will be lost.
When battery power becomes
low, a message will show
indicating that a new set of
batteries are needed.
1. Turn off the calculator’s
power ( @ o).
2. Turn over the calculator.
Locate the battery compart-
ment cover, and open the
cover as illustrated.
3. Replace all four AAA
batteries as illustrated.
4. Replace the battery com-
partment cover.
5. Press O.
The following message will
appear.
If the message does not
appear, repeat the proce-
dures from step 2.
6. Press O.
Do not press C C C C C. This will clear all the data.
Replacing the
memory backup
battery
Procedures for
replacing unit
operation
batteries