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Replacing the Batteries

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The HP 50g calculator takes 4 AAA (LR03) batteries as a main power source and one CR2032 lithium battery for memory backup.
If the low battery symbol appears on the display of the HP 50g calculator, replace the batteries as soon as possible. However, to avoid loss of data, remove the backup battery and main batteries at the same time.
Have the new batteries readily at hand before opening the battery compartment. Once the batteries are removed, replace them within 2 minutes to avoid losing stored information.
To install the main batteries:
  1. Turn off the calculator.
  2. Slide up the battery compartment cover.
  3. Remove the old batteries.
  4. Insert 4 new AAA (LR03) batteries into the main compartment.
  5. Make sure each battery is inserted in the indicated direction.
Follow these steps to install the new backup battery:
  1. Turn off the calculator.
  2. Remove the back cover of the battery compartment. The lithium battery is located underneath the small square cover located above the AAA batteries. Carefully remove the cover by sliding the tabs forward to align with the slots and gently lift the cover off.
  3. Remove the old battery.
  4. Insert a new CR2032 lithium battery with its positive polarity facing up.
  5. Replace the back cover of the backup battery.
  6. Replace the cover to the battery compartment.
  7. Press to turn on the calculator.