HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 297
again until, Do not press - battery removal
UPC - 082916001456
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Once you've removed the batteries, replace them within 2 minutes to avoid losing stored information. (Have the new batteries readily at hand before you open the battery compartment.) To install batteries: 1. Have two fresh button-cell batteries at hand. Avoid touching the battery terminals - handle batteries only by their edges. 2. Make sure the calculator is OFF. Do not press ON ( ) again until the entire battery-changing procedure is completed. If the calculator is ON when the batteries are removed, the contents of Continuous Memory will be erased. 3. Turn the calculator over and slide off the battery cover. 4. Never remove two old batteries at the same time, to prevent memory lose. Remove one of the two batteries. Press down the holder. Push the plate in the shown direction and lift it. Support, Batteries, and Service A-3