Replacing the Backup Battery
The backup battery can support the solar cell for approximately seven years at room temperature (20° C/68° F).
If a weak battery is left in the calculator, the memory contents may be lost.
When to replace:
•At least once every seven years, even if the calculator is functioning properly.
•The memory contents become null.
•The display dims in dark places.
•The display will not appear in insufficient lighting by pressing the 
key after the power is automatically turned off.
How to replace:
1.Turn the calculator face down with the folding support at the bottom. Lift the support up.
2.Pressing lightly on the battery cover, slide the cover off in the direction of the arrow. See Fig. 1.
3.Place a pointed object in the space shown in Fig. 2 and, using the object as a lever, Iift the battery out.
⊕side up as shown in Fig. 3.4. Install the new battery with the
5.Place the battery cover down as shown in Fig. 4.
6.Slide the cover in the direction shown in Fig. 5 until it clicks into place.
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