HP 48g Graphing Calculator User Manual
Page 399
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4. Write the date of installation on the card using a fine-point,
permanent marker. The date is important for determining when to
replace the battery.
Battery orientation symbol
Write installation
date here
Write
contents
here
28
5. Set an alarm in the calculator for 1 year from the date of
installation to remind you to replace the battery. (Depending on
the use, the battery should last between 1 and 3 years. When the
battery needs replacing, a display message will appear—but only if
the card is m the calculator. You set this alarm to remind yourself
in case the card isn’t in the calculator when the battery gets low.)
To set an alarm, see “Setting Alarms” on page 26-2. To replace a
RAM-card battery, see “To change a RAM card battery” on page
A-7.
Libraries, Ports and Plug-In Cards 28-11