It is best to have the new batteries to hand before starting this process - the old batteries may still have sufficient charge to keep the memory alive in the calculator even though the screen is blank.
Obtain two lithium type CR-2032 batteries and a small screwdriver. (See above for advice on purchasing batteries).
1) Turn the calculator off and place it face down on a table with the contrast control in the upper left-hand corner (the writing on the back of the calculator will be right-side up).
2) Remove the memory cartridge (flash card) from the back of the calculator.
3) Using a small screwdriver, remove the two screws holding the back. While lifting the edge of the calculator's back cover closest to you, slide it up to remove it.
4) Push down the stopper and slide the silver-coloured battery compartment cover upwards to open the compartment; remove the cover. The batteries are now disconnected; remove and discard them.
5) Install the new batteries, making sure the polarity (+ and -) is correct, and replace the battery compartment cover. (Make sure to replace the battery compartment cover--the batteries are not connected unless the battery compartment cover is in place.) Replace the back of the calculator by first hooking the 3 tabs on the top and then lowering the edge closest to you so you can replace the 2 screws.
6) Replace the memory cartridge (flash card) in the calculator. If it has been out of the calculator for more than about 5 minutes, you will have to initialise it. See below.
